GPU glitches

[probonopd]

I am experiencing GPU glitching that makes using maui-2.1-64bit.iso close to impossible after some time. I am attaching information about my AMD/ATI Cedar Radeon HD 5000/6000/7350/8350 Series setup and a screencast recorded with vokoscreen: https://www.dropbox.com/s/3aqtenrjv0y14oy/Maui-GFX-Glitches.mp4?dl=0

me@host:~/Arduino/libraries/Adafruit_NeoPixel$ /isodevice/Applications/Ard^C
me@host:~/Arduino/libraries/Adafruit_NeoPixel$ lspci | grep VGA ; lsmod | grep "kms\|drm" ; find /dev -group video ; \
> cat /proc/cmdline ; find /etc/modprobe.d/; cat /etc/modprobe.d/*kms* ; \
> ls /etc/X11/xorg.conf ; glxinfo | grep -i "vendor\|rendering" ; \
> grep LoadModule /var/log/Xorg.0.log
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series]
drm_kms_helper        155648  1 radeon
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
fb_sys_fops            16384  1 drm_kms_helper
drm                   364544  16 ttm,drm_kms_helper,radeon
find: ‘/dev/vboxusb’: Permission denied
/dev/fb0
/dev/dri/card0
/dev/dri/renderD128
/dev/dri/controlD64
BOOT_IMAGE=(loop)/casper/vmlinuz.efi file=/cdrom/preseed/maui.seed boot=casper iso-scan/filename=/boot/iso/maui-2.1-64bit.iso quiet splash --- for-casper --> iso-scan/filename=/boot/iso/maui-2.1-64bit.iso console-setup/layoutcode=de locale= timezone=Europe/Berlin username=me hostname=host noprompt init=/isodevice/boot/customize/init max_loop=256
/etc/modprobe.d/
/etc/modprobe.d/alsa-base.conf
/etc/modprobe.d/blacklist-ath_pci.conf
/etc/modprobe.d/blacklist-firewire.conf
/etc/modprobe.d/blacklist-framebuffer.conf
/etc/modprobe.d/blacklist-modem.conf
/etc/modprobe.d/blacklist-oss.conf
/etc/modprobe.d/blacklist-rare-network.conf
/etc/modprobe.d/blacklist-watchdog.conf
/etc/modprobe.d/blacklist.conf
/etc/modprobe.d/dkms.conf
/etc/modprobe.d/fbdev-blacklist.conf
/etc/modprobe.d/iwlwifi.conf
/etc/modprobe.d/mlx4.conf
/etc/modprobe.d/vmwgfx-fbdev.conf
/etc/modprobe.d/hid_apple.conf
# modprobe information used for DKMS modules
#
# This is a stub file, should be edited when needed,
# used by default by DKMS.
ls: cannot access '/etc/X11/xorg.conf': No such file or directory
direct rendering: Yes
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
    Vendor: X.Org (0x1002)
OpenGL vendor string: X.Org
[  3226.114] (II) LoadModule: "glx"
[  3226.116] (II) LoadModule: "ati"
[  3226.116] (II) LoadModule: "radeon"
[  3226.116] (II) LoadModule: "modesetting"
[  3226.117] (II) LoadModule: "fbdev"
[  3226.117] (II) LoadModule: "vesa"
[  3226.124] (II) LoadModule: "fbdevhw"
[  3226.125] (II) LoadModule: "fb"
[  3226.125] (II) LoadModule: "dri2"
[  3226.125] (II) LoadModule: "exa"
[  3226.284] (II) LoadModule: "ramdac"
[  3226.345] (II) LoadModule: "evdev"

[star-buck]

Extracted the video for easier viewing: https://www.dropbox.com/s/3aqtenrjv0y14oy/Maui-GFX-Glitches.mp4?dl=0

[star-buck]

@davidedmundson : any idea what Simon could check or do?

[probonopd]

Also see https://www.youtube.com/watch?v=8CcLpcNghCI (not by me)