Public bug reported:
kernel-version: Ubuntu 5.15.0-41.44~20.04.1-generic 5.15.39
xorg-core: 2:1.20.13-1ubuntu1~20.04.3
cpu: 12th Gen Intel(R) Core(TM) i5-12600
gpu: VGA compatible controller: Intel Corporation Device 4690 (rev 0c)
problem: depending on how the layers are used by different programs the
display is disturbed by slow refresh. it takes up to 2-3 seconds until
the layer is shown without errors.
(it's afresh install, tested until now:
- firefox: very slow refresh for all menus and gagets, on scrolling or playing
video
- scribus: slow refresh on menus and gadgets, no problem with the pages
- remote-viewer (spice): slow refresh on menus and gadgets, a few problems with
the screen (even with firefox in kvm)
- libreoffice, gimp, inkscape: no problems
tried all combinations of i915-options for enable_guc={0..3},
enable_fbc={0,1} with no difference (firmware loaded was
tgl_guc_62.0.0.bin, tgl_huc_7.9.3.bin depending on options)
but if the i915-driver is deactivated (accidently made a syntax-error at
options, which leads to self-deactivation of the driver), no such
problems are seen (unfortunately the second port is unusable then -- and
before anyone asks: even if i915 is loaded and only one monitor is
connected, the problems occure)
as explanation, how these errors look, I've made a picture of a text-
only-webpage (no javascript) during scrolling (this is extreme, but is
best for showing the horizontal fragments)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "refresh-errors with i915driver on UHD770"
https://bugs.launchpad.net/bugs/1982850/+attachment/5605387/+files/scrollen.jpg
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https://bugs.launchpad.net/bugs/1982850
Title:
i915 refresh on UHD770 lagged/disturbed
Status in linux package in Ubuntu:
New
Bug description:
kernel-version: Ubuntu 5.15.0-41.44~20.04.1-generic 5.15.39
xorg-core: 2:1.20.13-1ubuntu1~20.04.3
cpu: 12th Gen Intel(R) Core(TM) i5-12600
gpu: VGA compatible controller: Intel Corporation Device 4690 (rev 0c)
problem: depending on how the layers are used by different programs
the display is disturbed by slow refresh. it takes up to 2-3 seconds
until the layer is shown without errors.
(it's afresh install, tested until now:
- firefox: very slow refresh for all menus and gagets, on scrolling or
playing video
- scribus: slow refresh on menus and gadgets, no problem with the pages
- remote-viewer (spice): slow refresh on menus and gadgets, a few problems
with the screen (even with firefox in kvm)
- libreoffice, gimp, inkscape: no problems
tried all combinations of i915-options for enable_guc={0..3},
enable_fbc={0,1} with no difference (firmware loaded was
tgl_guc_62.0.0.bin, tgl_huc_7.9.3.bin depending on options)
but if the i915-driver is deactivated (accidently made a syntax-error
at options, which leads to self-deactivation of the driver), no such
problems are seen (unfortunately the second port is unusable then --
and before anyone asks: even if i915 is loaded and only one monitor is
connected, the problems occure)
as explanation, how these errors look, I've made a picture of a text-
only-webpage (no javascript) during scrolling (this is extreme, but is
best for showing the horizontal fragments)
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