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freebsd / drm-kmod

drm driver for FreeBSD
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DRM 6.1: Transient screen corruption and rare freezes (Intel UHD 620) #303

Open OlCe2 opened 1 month ago

OlCe2 commented 1 month ago

Description and reproduction

With DRM 6.1, in a freshly started KDE graphical session (Plasma X11), transient screen corruption, i.e., random pixels with all possible colors for some millisecond or less (may not be completely random, but rather some evolution of the regular displayed image; corruption doesn't last enough to be able to tell), can be observed when performing some actions. The easiest is to hover the pointer over applications in the task bar, which triggers display of thumbnails with some transparency. Other desktop effects seem to trigger it, as well as using Firefox. Usually, corruption is transient, but rarely the display freezes forever, with the original image decaying (with colors becoming darker and darker).

Though perhaps an unrelated problem (but playing a role here, as will be seen below), eventually plasmashell freezes, and sometimes kwin_x11 as well (this happens with every DRM version, 5.10, 5.15 and 6.1). After such a freeze, going to the text console and restarting kwin_x11 and plasmashell (with --replace) rejuvenates the desktop once and for all (no freeze then ever happens, except after suspend/resume, which seems to somehow reset the state).

Going back to the current bug, after a restart of KWin and Plasmashell as just explained, the screen corruption seems to be gone, and never happens again.

System Information

FreeBSD version

FreeBSD 14.1-STABLE #0 n267671-9a8a26aefb36: Mon May 13 13:39:56 CEST 2024 MYCONFIG 1401500 1401500 Kernel MYCONFIG is a stripped-down version of GENERIC close to MINIMAL.

PCI Info

vgapci0@pci0:0:2:0: class=0x030000 rev=0x02 hdr=0x00 vendor=0x8086 device=0x9b41 subvendor=0x1028 subdevice=0x0962 vendor = 'Intel Corporation' device = 'CometLake-U GT2 [UHD Graphics]' class = display subclass = VGA bar [10] = type Memory, range 64, base 0x604a000000, size 16777216, enabled bar [18] = type Prefetchable Memory, range 64, base 0x4000000000, size 268435456, enabled bar [20] = type I/O Port, range 32, base 0x3000, size 64, enabled cap 09[40] = vendor (length 12) Intel cap 0 version 1 cap 10[70] = PCI-Express 2 root endpoint max data 128(128) FLR max read 128 cap 05[ac] = MSI supports 1 message enabled with 1 message cap 01[d0] = powerspec 2 supports D0 D3 current D0 ecap 001b[100] = Process Address Space ID 1 ecap 000f[200] = ATS 1 ecap 0013[300] = Page Page Request 1

DRM KMOD version

Problem reproduced with: drm-61-kmod 6.1.69_2

No problem with: drm-510-kmod 5.10.163_9 drm-515-kmod 5.15.118_4

The KWin/Plasmashell freeze secondary problem evoked above occurs with any of the DRM KMODs listed above.

Feel free to ask for more information.

(Part of the time spent on this report was sponsored by the FreeBSD Foundation.)

OlCe2 commented 1 month ago

After a search over the DRM bugs database, this issue might be related to: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/5969 even if the kind of visual corruption I'm getting is quite different than that visible in the video attached to that bug.

I'll try some hand-patching in the lines of what is suggested there to see if this makes any difference here.

evadot commented 1 month ago

I will love to help here but I don't have this problem at all on all my machines. My main machines are skylake and whiskeylake. Also could be only triggered by something wrt kde as I run sway on all of them.