libvnc.so screen not refreshing when glamor is used

[joakim-tjernlund]

Describe the bug Remmina VNC shows a blank window with a few small fragments Disabled MATE compositing renders fine.

Client (please complete the following information):

• OS: Gentoo
• VNC client: [Remmina 1.4.12]
• Client downloaded from: [Gentoo]

Server (please complete the following information):

• same as above

Additional context This is an old problem, I think it started before tigervnc 1.11, using master now.

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[joakim-tjernlund]

VNC works with vino(3.22.0) though.

[CendioOssman]

This works just fine on other systems so there must be something specific to either Gentoo or your server. Have you checked logs for any errors?

Could you test our builds to see if they work? Might be some build issue.

[CendioOssman]

And please include the full information from the bug template so we get a complete picture of your system.

[joakim-tjernlund]

This works just fine on other systems so there must be something specific to either Gentoo or your server. Have you checked logs for any errors?

I locked in Xorg.0.log , not sure what else there is?

Could you test our builds to see if they work? Might be some build issue.

I cannot find the xorg module, /usr/lib64/xorg/modules/extensions/libvnc.so, in your build ?

[CendioOssman]

I locked in Xorg.0.log , not sure what else there is?

That will show you any complaints from Xorg or TigerVNC, so it's a good start. But it would also be good to check if MATE or one of its components is complaining.

I'm not aware of how Gentoo works though, so I can't give a clear answer where to look. I would guess either ~/.xsession-errors or in the journal though.

I cannot find the xorg module, /usr/lib64/xorg/modules/extensions/libvnc.so, in your build ?

That is unfortunately not something that is included as it must be tailored for each distribution. It wasn't clear which server you were using so I assumed it was Xvnc, which is the most common case.

[joakim-tjernlund]

And please include the full information from the bug template so we get a complete picture of your system.

Server (please complete the following information):

• OS: Gentoo
• VNC server: xorg/modules/extensions/libvnc.so (built against Xorg 1.20.10) + Xorg 1.20.10
• VNC server version: master
• Server downloaded from: tigervnc master on github
• Server was started using:

  
  cat 50-vnc.conf
  Section "Module"
  Load "vnc"
  EndSection

Section "Screen" Identifier "Default Screen" Option "PasswordFile" "/root/.vnc/passwd"

Option "SecurityTypes" "None"

Option "rfbport" "5902"

EndSection

Need more?

[joakim-tjernlund]

I locked in Xorg.0.log , not sure what else there is?

That will show you any complaints from Xorg or TigerVNC, so it's a good start. But it would also be good to check if MATE or one of its components is complaining.

I have looked in a lot of places but no logs/errors found

I'm not aware of how Gentoo works though, so I can't give a clear answer where to look. I would guess either ~/.xsession-errors or in the journal though.

Gentoo is a source dist so every pkg is built locally before it is installed. Here is my configre cmd if that helps:

./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --docdir=/usr/share/doc/tigervnc-9999 --htmldir=/usr/share/doc/tigervnc-9999/html --with-sysroot=/ --libdir=/usr/lib64 --enable-glx --enable-libdrm --disable-config-hal --disable-config-udev --disable-devel-docs --disable-dmx --disable-dri --enable-dri3 --disable-glamor --disable-kdrive --disable-libunwind --disable-linux-acpi --disable-record --disable-selective-werror --disable-static --disable-unit-tests --disable-xephyr --enable-xinerama --disable-xnest --disable-xorg --disable-xvfb --disable-xwin --disable-xwayland --enable-dri2 --with-pic --without-dtrace --disable-present --with-sha1=libcrypto
configure: loading site script /usr/share/config.site
checking for a BSD-compatible install... /usr/lib/portage/python3.7/ebuild-helpers/xattr/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports the include directive... yes (GNU style)
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checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... yes
checking for x86_64-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking whether x86_64-pc-linux-gnu-gcc understands -c and -o together... yes
checking dependency style of x86_64-pc-linux-gnu-gcc... none
checking how to run the C preprocessor... x86_64-pc-linux-gnu-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
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checking for sys/stat.h... yes
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checking for string.h... yes
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checking for x86_64-pc-linux-gnu-gcc option to accept ISO C99... none needed
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checking pkg-config is at least version 0.9.0... yes
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checking if x86_64-pc-linux-gnu-gcc supports -Wuninitialized... yes
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configure: WARNING: You have chosen not to turn some select compiler warnings into errors.  This should not be necessary.  Please report why you needed to do so in a bug report at https://gitlab.freedesktop.org/xorg/xserver/issues
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checking if x86_64-pc-linux-gnu-gcc supports -pedantic... yes
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checking whether make supports nested variables... (cached) yes
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checking the doxygen version... 1.8.20
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checking the xmlto version... 0.0.28
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configure: WARNING: fop not found - documentation targets will be skipped
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checking whether to build unit test cases... no
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checking dependency style of x86_64-pc-linux-gnu-gcc... none
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checking whether we are using the GNU C++ compiler... yes
checking whether x86_64-pc-linux-gnu-g++ accepts -g... yes
checking dependency style of x86_64-pc-linux-gnu-g++... none
checking whether ln -s works... yes
checking how to print strings... printf
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checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/x86_64-pc-linux-gnu-nm -B
checking the name lister (/usr/bin/x86_64-pc-linux-gnu-nm -B) interface... BSD nm
checking the maximum length of command line arguments... 1572864
checking how to convert x86_64-pc-linux-gnu file names to x86_64-pc-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-pc-linux-gnu file names to toolchain format... func_convert_file_noop
checking for /usr/x86_64-pc-linux-gnu/bin/ld option to reload object files... -r
checking for x86_64-pc-linux-gnu-objdump... x86_64-pc-linux-gnu-objdump
checking how to recognize dependent libraries... pass_all
checking for x86_64-pc-linux-gnu-dlltool... no
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checking how to associate runtime and link libraries... printf %s\n
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checking command to parse /usr/bin/x86_64-pc-linux-gnu-nm -B output from x86_64-pc-linux-gnu-gcc object... ok
checking for sysroot... /
checking for a working dd... /bin/dd
checking how to truncate binary pipes... /bin/dd bs=4096 count=1
checking for x86_64-pc-linux-gnu-mt... no
checking for mt... no
checking if : is a manifest tool... no
checking for dlfcn.h... yes
checking for objdir... .libs
checking if x86_64-pc-linux-gnu-gcc supports -fno-rtti -fno-exceptions... no
checking for x86_64-pc-linux-gnu-gcc option to produce PIC... -fPIC -DPIC
checking if x86_64-pc-linux-gnu-gcc PIC flag -fPIC -DPIC works... yes
checking if x86_64-pc-linux-gnu-gcc static flag -static works... yes
checking if x86_64-pc-linux-gnu-gcc supports -c -o file.o... yes
checking if x86_64-pc-linux-gnu-gcc supports -c -o file.o... (cached) yes
checking whether the x86_64-pc-linux-gnu-gcc linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking how to run the C++ preprocessor... x86_64-pc-linux-gnu-g++ -E
checking for ld used by x86_64-pc-linux-gnu-g++... /usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64
checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) is GNU ld... yes
checking whether the x86_64-pc-linux-gnu-g++ linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking for x86_64-pc-linux-gnu-g++ option to produce PIC... -fPIC -DPIC
checking if x86_64-pc-linux-gnu-g++ PIC flag -fPIC -DPIC works... yes
checking if x86_64-pc-linux-gnu-g++ static flag -static works... yes
checking if x86_64-pc-linux-gnu-g++ supports -c -o file.o... yes
checking if x86_64-pc-linux-gnu-g++ supports -c -o file.o... (cached) yes
checking whether the x86_64-pc-linux-gnu-g++ linker (/usr/x86_64-pc-linux-gnu/bin/ld -m elf_x86_64) supports shared libraries... yes
checking dynamic linker characteristics... (cached) GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking for x86_64-pc-linux-gnu-pkg-config... (cached) /usr/bin/x86_64-pc-linux-gnu-pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for flex... flex
checking lex output file root... lex.yy
checking lex library... -lfl
checking whether yytext is a pointer... yes
checking for bison... bison -y
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for x86_64-pc-linux-gnu-cpp... /usr/bin/x86_64-pc-linux-gnu-cpp
checking if /usr/bin/x86_64-pc-linux-gnu-cpp requires -undef... yes
checking if /usr/bin/x86_64-pc-linux-gnu-cpp requires -traditional... yes
checking for dirent.h that defines DIR... yes
checking for library containing opendir... none required
checking for ANSI C header files... (cached) yes
checking fcntl.h usability... yes
checking fcntl.h presence... yes
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checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
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checking stropts.h usability... no
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checking for an ANSI C-conforming const... yes
checking for typeof syntax and keyword spelling... typeof
checking whether byte ordering is bigendian... no
checking size of unsigned long... 8
checking for pid_t... yes
checking for dlopen... no
checking for dlopen in -ldl... yes
checking for backtrace... yes
checking for geteuid... yes
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checking for issetugid... no
checking for getresuid... yes
checking for getdtablesize... yes
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checking for mmap... yes
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checking for strncasecmp... yes
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checking for walkcontext... no
checking for setitimer... yes
checking for poll... yes
checking for epoll_create1... yes
checking for mkostemp... yes
checking for memfd_create... yes
checking for isastream... no
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checking for arc4random_buf in -lbsd... yes
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checking linux/fb.h usability... yes
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checking for sys/linker.h... no
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checking execinfo.h usability... yes
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checking for backtrace in -lc... yes
checking for fallback input driver... libinput
checking for root directory for font files... /usr/share/fonts
checking for directory for misc files... ${FONTROOTDIR}/misc
checking for directory for OTF files... ${FONTROOTDIR}/OTF
checking for directory for TTF files... ${FONTROOTDIR}/TTF
checking for directory for Type1 files... ${FONTROOTDIR}/Type1
checking for directory for 75dpi files... ${FONTROOTDIR}/75dpi
checking for directory for 100dpi files... ${FONTROOTDIR}/100dpi
checking for default font path... ${FONTROOTDIR}/misc/,${FONTROOTDIR}/TTF/,${FONTROOTDIR}/OTF/,${FONTROOTDIR}/Type1/,${FONTROOTDIR}/100dpi/,${FONTROOTDIR}/75dpi/
checking to see if we can install the Xorg server as root... no
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checking for a useful monotonic clock ...... yes
checking whether to track client ids... yes
checking for dri2proto >= 2.8... yes
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checking for sigaction... yes
checking for xshmfence >= 1.1... yes
configure: DRI3 enabled
checking for libdrm >= 2.4.89... yes
checking for x11... yes
checking for glproto >= 1.4.17 gl... yes
checking for xdmcp... yes
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checking for SHA1 implementation... libcrypto
checking for fixesproto >= 5.0 damageproto >= 1.1 xcmiscproto >= 1.2.0 xtrans >= 1.3.5 bigreqsproto >= 1.1.0 xproto >= 7.0.31 randrproto >= 1.6.0 renderproto >= 0.11 xextproto >= 7.2.99.901 inputproto >= 2.3 kbproto >= 1.0.3 fontsproto >= 2.1.3 pixman-1 >= 0.27.2 videoproto compositeproto >= 0.4 scrnsaverproto >= 1.1 resourceproto >= 1.2.0 dri3proto xineramaproto xkbfile  pixman-1 >= 0.27.2 xfont2 >= 2.0.0 xau xshmfence >= 1.1 xdmcp... yes
checking for  pixman-1 >= 0.27.2 xfont2 >= 2.0.0 xau xshmfence >= 1.1 xdmcp... yes
checking for libunwind... no
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checking for xext >= 1.0.99.4 x11 xau xdmcp... yes
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checking dependency style of $(CC)... none
checking for xmuu xext >= 1.0.99.4 x11 >= 1.6 xrender xfixes xi >= 1.2.99.1 dmxproto >= 2.2.99.1 xau xdmcp... yes
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checking for wayland-client >= 1.3.0 wayland-protocols >= 1.10 libdrm >= 2.4.89 epoxy xf86vidmodeproto >= 2.2.99.1... yes
checking whether to build Xwayland DDX... no
configure: WARNING:
             ***********************************************
             Neither HAL nor udev backend will be enabled.
             Input device hotplugging will not be available!
             ***********************************************
checking that generated files are newer than configure... done
configure: creating ./config.status

[joakim-tjernlund]

I downgraded to tigervnc to 1.9 and the problem is still there, how odd. What might have changed to cause this bug? xorg-server ?

[joakim-tjernlund]

Plasma has the same problem, display is just blank.

[CendioOssman]

I have looked in a lot of places but no logs/errors found

It definitely logs somewhere, so we need to figure out where. Do you get anything useful out of ls -l /proc/`pgrep mate-session`/fd when the session is running?

I downgraded to tigervnc to 1.9 and the problem is still there, how odd. What might have changed to cause this bug? xorg-server ?

Yeah, that or something in the X11 infrastructure.

Do you get an updated image if you press F8 and select Refresh screen?

[joakim-tjernlund]

Refresh does not help. If I turn compositing inside the session, every window disappears. ls -l /proc/pgrep mate-session/fd

total 0
dr-x------ 2 jocke users  0 Mar 16 13:45 ./
dr-xr-xr-x 9 jocke users  0 Mar 16 13:43 ../
lr-x------ 1 jocke users 64 Mar 16 13:45 0 -> 'pipe:[239440]'
l-wx------ 1 jocke users 64 Mar 16 13:45 1 -> /dev/null
lrwx------ 1 jocke users 64 Mar 16 13:45 10 -> 'anon_inode:[eventfd]'
lrwx------ 1 jocke users 64 Mar 16 13:45 11 -> 'anon_inode:[eventfd]'
lrwx------ 1 jocke users 64 Mar 16 13:45 12 -> 'socket:[237086]'
lrwx------ 1 jocke users 64 Mar 16 13:45 13 -> 'socket:[237087]'
lrwx------ 1 jocke users 64 Mar 16 13:45 14 -> 'socket:[237088]'
lrwx------ 1 jocke users 64 Mar 16 13:45 15 -> 'socket:[244771]'
lr-x------ 1 jocke users 64 Mar 16 13:45 16 -> 'pipe:[237090]'
l-wx------ 1 jocke users 64 Mar 16 13:45 17 -> 'pipe:[237090]'
lrwx------ 1 jocke users 64 Mar 16 13:45 18 -> 'socket:[237091]'
lrwx------ 1 jocke users 64 Mar 16 13:45 19 -> 'socket:[239481]'
l-wx------ 1 jocke users 64 Mar 16 13:45 2 -> /home/jocke/.local/share/sddm/xorg-session.log
lrwx------ 1 jocke users 64 Mar 16 13:45 20 -> 'socket:[241936]'
lrwx------ 1 jocke users 64 Mar 16 13:45 21 -> 'socket:[244106]'
lrwx------ 1 jocke users 64 Mar 16 13:45 22 -> 'socket:[237096]'
lrwx------ 1 jocke users 64 Mar 16 13:45 23 -> 'socket:[246800]'
lrwx------ 1 jocke users 64 Mar 16 13:45 24 -> 'socket:[244884]'
lrwx------ 1 jocke users 64 Mar 16 13:45 3 -> 'socket:[244767]'
lrwx------ 1 jocke users 64 Mar 16 13:45 4 -> /dev/dri/card0
lrwx------ 1 jocke users 64 Mar 16 13:45 5 -> /dev/dri/card0
lr-x------ 1 jocke users 64 Mar 16 13:45 6 -> /var/lib/sss/mc/passwd
lrwx------ 1 jocke users 64 Mar 16 13:45 7 -> 'anon_inode:[eventfd]'
lrwx------ 1 jocke users 64 Mar 16 13:45 8 -> 'anon_inode:[eventfd]'
lrwx------ 1 jocke users 64 Mar 16 13:45 9 -> 'socket:[244770]'

and cat /home/jocke/.local/share/sddm/xorg-session.log:

mate-session[29787]: WARNING: Unable to find provider '' of required component 'dock'
Window manager warning: Log level 128: unsetenv() is not thread-safe and should not be used after threads are created
vmware-user: could not open /proc/fs/vmblock/dev
Error: /usr/bin/vmtoolsd must be run inside a virtual machine on a VMware hypervisor product.

(caja:29847): Gtk-WARNING **: 13:44:00.189: Failed to register client: GDBus.Error:org.gnome.SessionManager.AlreadyRegistered: Unable to register client
16/03/2021 13:44:00 Autoprobing TCP port in (all) network interface
16/03/2021 13:44:00 Listening IPv6://[::]:5900
16/03/2021 13:44:00 Listening IPv4://0.0.0.0:5900
16/03/2021 13:44:00 Autoprobing selected port 5900
16/03/2021 13:44:00 Advertising security type: 'TLS' (18)
16/03/2021 13:44:00 Re-binding socket to listen for VNC connections on TCP port 5900 in (all) interface
16/03/2021 13:44:00 Listening IPv6://[::]:5900
16/03/2021 13:44:00 Listening IPv4://0.0.0.0:5900
16/03/2021 13:44:00 Clearing securityTypes
16/03/2021 13:44:00 Advertising security type: 'TLS' (18)
16/03/2021 13:44:00 Clearing securityTypes
16/03/2021 13:44:00 Advertising security type: 'TLS' (18)
16/03/2021 13:44:00 Advertising authentication type: 'No Authentication' (1)
16/03/2021 13:44:00 Re-binding socket to listen for VNC connections on TCP port 5900 in (all) interface
16/03/2021 13:44:00 Listening IPv6://[::]:5900
16/03/2021 13:44:00 Listening IPv4://0.0.0.0:5900
16/03/2021 13:44:00 Clearing securityTypes
16/03/2021 13:44:00 Clearing authTypes
16/03/2021 13:44:00 Advertising security type: 'TLS' (18)
16/03/2021 13:44:00 Advertising authentication type: 'VNC Authentication' (2)

(mate-power-manager:29880): Gdk-CRITICAL **: 13:44:00.909: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed
blueman-applet 13.44.01 WARNING  PluginManager:148 __load_plugin: Not loading DhcpClient because its conflict has higher priority
blueman-applet 13.44.01 WARNING  PluginManager:148 __load_plugin: Not loading PPPSupport because its conflict has higher priority

[joakim-tjernlund]

While I was typing this, the screen locker kicked in and I see this image. I can type my passwd but the screen is never redrawn. The PW takes effect though.

[CendioOssman]

Hmm... that suggests that the rendering is completely broken, rather then just not getting transmitted to the client.

Since this is libvnc.so you should also have a local display. What do things look like there? Like it should or the same issue?

[joakim-tjernlund]

It looks fine on both local display and in VINO VNC server

[joakim-tjernlund]

And the background is still there, only the background though. Anything missing in configure? What deps are you using ?

[joakim-tjernlund]

What about modesetting? It was disabled by default in Xorg: https://gitlab.freedesktop.org/xorg/xserver/-/commit/1ba5e528d52ed9d7d67eb45c5d3e04b6f5d22b05

[joakim-tjernlund]

Got a libvnc.so question, is it possible to setup libvnc.so Xorg module so that its only active in sddm? Once sddm starts the session, libvnc.so should be gone.

[CendioOssman]

modesetting (atomic or otherwise) is not involved here, so unfortunately that is not in.

The next suspect area is some bug with the readback of graphics from the graphics card. Given that it works without compositing that would again suggest some driver issue.

What graphics driver are you using? Have you checked if it might have some tweaks that could affect this? E.g. turning off glamor.

[CendioOssman]

Got a libvnc.so question, is it possible to setup libvnc.so Xorg module so that its only active in sddm? Once sddm starts the session, libvnc.so should be gone.

Maybe. If sddm starts a new X server you could perhaps use a different config for that.

What would be the point though? I would assume a VNC server for just the login screen wouldn't be very useful.

[joakim-tjernlund]

it is a standard builtin Intel device and its just not one machine, it is various DEs/laptops that has the problem.

[joakim-tjernlund]

Got a libvnc.so question, is it possible to setup libvnc.so Xorg module so that its only active in sddm? Once sddm starts the session, libvnc.so should be gone.

Maybe. If sddm starts a new X server you could perhaps use a different config for that.

What would be the point though? I would assume a VNC server for just the login screen wouldn't be very useful.

Then each user can have its own VINO server(if they want one) with their auth.

[joakim-tjernlund]

Got a libvnc.so question, is it possible to setup libvnc.so Xorg module so that its only active in sddm? Once sddm starts the session, libvnc.so should be gone.

Maybe. If sddm starts a new X server you could perhaps use a different config for that. What would be the point though? I would assume a VNC server for just the login screen wouldn't be very useful.

Then each user can have its own VINO server(if they want one) with their auth.

The general idea here is that one have a PW less xdm login page but once user logs in VNC auth must kick in for the user

[joakim-tjernlund]

modesetting (atomic or otherwise) is not involved here, so unfortunately that is not in.

The next suspect area is some bug with the readback of graphics from the graphics card. Given that it works without compositing that would again suggest some driver issue.

What graphics driver are you using? Have you checked if it might have some tweaks that could affect this? E.g. turning off glamor.

Disabling glamor makes it WORK :)

[CendioOssman]

We've heard of issues with glamor before, but unfortunately I don't have any device suitable for testing here. The issue does not appear in a VMware virtual machine. :/

Could you report a bug with Xorg so the glamor maintainers could have a look?

[joakim-tjernlund]

We've heard of issues with glamor before, but unfortunately I don't have any device suitable for testing here. The issue does not appear in a VMware virtual machine. :/

Could you report a bug with Xorg so the glamor maintainers could have a look?

https://gitlab.freedesktop.org/xorg/xserver/-/issues/1152

[joakim-tjernlund]

We've heard of issues with glamor before, but unfortunately I don't have any device suitable for testing here. The issue does not appear in a VMware virtual machine. :/

Could you report a bug with Xorg so the glamor maintainers could have a look?

Thinking about this I don't think glamor mant. will be of much help unless you describe what libvnc does. or get a Intel/AMD card so you can see it yourself :)

[joakim-tjernlund]

So no help from Xorg, any progress on your own?

[CendioOssman]

I'm afraid I don't have the time to start digging around at that level. So until the glamor people (or someone else) has a look, this issue will likely remain.

[joakim-tjernlund]

It occurred to me that maybe this never worked with Glamor? Not sure when Glamor became default in Gentoo.

[joakim-tjernlund]

Tested with the new xorg-server 1.20.12 , still the same problem.

When I choose compositing I just get a background img, all icons, trays, windows etc. are gone. Flip compositing off , everything returns. Feels like tigervnc is drawing from the wrong FB?

[joakim-tjernlund]

Same problem with xorg-server-21.1.3

[rclar802]

Has there been change since?

[joakim-tjernlund]

Not really, just that I now known that it is really Intel/glamor. AMD works fine. The problem is in Xorg glamor taking a shortcut somewhere.

[warrenc5]

I was troubleshooting an issue with enlightenment/wayland/glx/nvidia/compositor/x11/libvnc/remmina where the screen would look like this.

I thought I had tried every combination of settings in the compositor -

If I select "force tight encoding" I initially see the entire screen.

But the behavior is the same - new/moved windows don't draw correctly.

I've looked into xdamage module - I don't know if that's involved - I haven't explicitly enabled it in my xorg.conf modules section.

Is this the same/similar issue you are seening?
I only mean to share, not hijack this issue. Should I raise a new report with all my version details?

[joakim-tjernlund]

Not quite, I get a black screen but who knows, maybe Nvidia is different. Does it work if you turn compositor off?

[warrenc5]

Ta. Yes it works when compositor is off.

I get a blank screen too - but if I choose "tight mode" then I see this "glitching"

I might raise another ticket.

[joakim-tjernlund]

OK, then I think same problem. So both Nvidia and Intel seems to have the same problem

[joakim-tjernlund]

https://gitlab.freedesktop.org/xorg/xserver/-/issues/1152 for Xorg

[Juniorsnet]

for me after tinkering with xorg options, the config that work with compositor enabled is:

Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "uxa" Option "SwapbuffersWait" "false" EndSection

For AMD (APU A4-9120) only works disabling glamor or compositor.

[joakim-tjernlund]

for me after tinkering with xorg options, the config that work with compositor enabled is:

Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "uxa" Option "SwapbuffersWait" "false" EndSection

For AMD (APU A4-9120) only works disabling glamor or compositor.

OK, I think you should add this to the xorg-server ticket too