SRU: https://lists.ubuntu.com/archives/kernel-
team/2022-March/128694.html (oem-5.14)
** Description changed:
+ [SRU Justfication]
+
+ [Impact]
+
+ Disjoint trackpad/mouse path found on PSR capable panels.
+
+ [Fix]
+
+ Two fixes from v5.17-rc6 that only turns off vblank IRQs when PSR is not
+ enabled, originally for commit f94cf1cb1796 ("drm/amdgpu/display: set
+ vblank_disable_immediate for DC") that was being backported to LTS stable
+ 5.15.y, and therefore oem-5.14.
+
+ [Test Case]
+
+ Simply move the mouse around.
+
+ [Where problems could occur]
+
+ This follows for AMD platforms, the power-saving performance may not be
+ as good as before, but while we don't have such energy-saving
+ certificate program for AMD yet, this would become something to be fully
+ addressed in the future.
+
+ [Other Info]
+
+ These fixes have been applied to v5.15.27, and oem-5.14 currently has
+ v5.15.25 in -1028, therefore only oem-5.14 is nominated, but probably
+ they will still be included through stable patch backport in the next
+ release.
+
+ ========== original bug report ==========
+
Observed choppy issue for touchpad on HP Lockheed with OEM-1025 kernel, and
can't smoothly drag USB mouse if connected.
Rolled back to OEM-1023 kernel and observed the same issues.
Can't reproduce the issue with OEM-1022 kernel.
Bisect identified the problematic commits below,
- 021e2c1f6143 drm/amdgpu/display: set vblank_disable_immediate for DC
- 1a4dd5a679da drm/amd/display: check top_pipe_to_program pointer
+ 021e2c1f6143 drm/amdgpu/display: set vblank_disable_immediate for DC
+ 1a4dd5a679da drm/amd/display: check top_pipe_to_program pointer
Reverting above 2 commits on the top of oem-5.14-5.14.0-1025.27,
touchpad or USB mouse back to normal working behavior on HP Lockheed and
we don't see choppy trackpad/mouse issue.
$ git log --oneline -5
62e596025e1e (HEAD -> fm_oem-5.14-next) Revert "drm/amd/display: check
top_pipe_to_program pointer"
82cab088605f Revert "drm/amdgpu/display: set vblank_disable_immediate for DC"
165041ee003c (tag: Ubuntu-oem-5.14-5.14.0-1025.27, origin/oem-5.14-next)
UBUNTU: Ubuntu-oem-5.14-5.14.0-1025.27
8bdd3e2ea820 UBUNTU: [Config] Update config to match upstream stable release
43f3b8b56abe UBUNTU: debian/dkms-versions -- update from kernel-versions
(main/2022.02.21)
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https://bugs.launchpad.net/bugs/1964850
Title:
Choppy trackpad/USB mouse behavior with oem-1023 or above kernel
version
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