[Bug 1190200] New: Severe graphics glitches in KDE applications when compositor is disabled
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200 Bug ID: 1190200 Summary: Severe graphics glitches in KDE applications when compositor is disabled Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: psychonaut@nothingisreal.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- I normally run KDE with the compositor disabled. In this mode, all KDE applications exhibit severe screen corruption: all new text or graphics that appear have a garbled appearance, to the extent that text is completely illegible. The corruption sometimes disappears after a few seconds or after the window is scrolled. The problem does not affect GTK+ applications. The problem can be worked around by using systemsettings5 to tell KDE to enable the compositor at startup. However, simply changing the rendering backend (XRender vs. OpenGL) has no effect. I am using an onboard Intel HD Graphics 630 controller with the i915 driver. I'm not sure if it's the kernel driver/firmware which is causing the problem, but based on past experience with Intel graphics glitches, I am tentatively assuming it is. The problem occurred after updating Tumbleweed from version 20210810 to version 20210827. (In case it's relevant, this included an update of kernel-default 5.13.8 to 5.13.12, and from kernel-firmware-i915 from 20210719 to 20210812.) The problem persists in version 20210830. Booting from the old 5.13.8 kernel doesn't work around the problem. I could also try reverting kernel-firmware-i915 if I can find or build an old package. -- You are receiving this mail because: You are the assignee for the bug.
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200#c1
--- Comment #1 from Tristan Miller
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200#c2
Felix Miata
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200#c4
--- Comment #4 from Tristan Miller
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200
http://bugzilla.opensuse.org/show_bug.cgi?id=1190200#c5
--- Comment #5 from Tristan Miller
Just upgraded from openSUSE 20211008 to 20211031, which included an update from kernel-default 5.14.9 to 5.14.14. The problem is now worse: the glitches appear even when the compositor is enabled.
Booting from the old 5.14.9 kernel doesn't work around the glitching problem, but booting from the old read-only snapshot does. Also, I've found that the glitching can be avoided by running a Wayland desktop instead of X11. (In reply to Takashi Iwai from comment #3)
Dup of bug 1190095?
I'm not sure; the symptoms reported are similar but still different. Bug 1190095 talks about a "slow redraw" where the screen glitches for a moment and then fixes itself. But in my case, I wouldn't say that the redraw is "slow"; the glitches appear instantaneously when a screen area changes (e.g., via scrolling), and they generally persist until I force that area of the screen to change again, at which point the glitching either changes or (if I'm lucky) disappears. -- You are receiving this mail because: You are the assignee for the bug.
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