[Bug 2069993] Re: Panels show garbage or flickering when i915.psr2 enabled

This bug is awaiting verification that the linux-xilinx/6.8.0-1009.10
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-noble-linux-xilinx' to 'verification-done-
noble-linux-xilinx'. If the problem still exists, change the tag
'verification-needed-noble-linux-xilinx' to 'verification-failed-noble-
linux-xilinx'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-xilinx-v2 verification-needed-noble-linux-xilinx

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https://bugs.launchpad.net/bugs/2069993

Title:
Panels show garbage or flickering when i915.psr2 enabled

Status in linux package in Ubuntu:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.8 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Committed
Status in linux-oem-6.11 source package in Noble:
In Progress
Status in linux-oem-6.8 source package in Noble:
Fix Released
Status in linux source package in Oracular:
New
Status in linux-oem-6.11 source package in Oracular:
Invalid
Status in linux-oem-6.8 source package in Oracular:
Invalid

Bug description:
SRU verification for oem-6.8-noble:

[Impact]
In https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.5/+bug/2046315,
we've cherry-picked the 8 patches from the most recent mainline kernel to oem-6.8
to fix the panel flickering problem in the Dell OEM project. However,
OEM reports that the patches have regression on 6.8.0-1006-oem.

For now, we apply the workaround patches from oem-6.5 to fix the bug.
In the meantime, we've reported the issue to Intel and are waiting for the fix.
Once the fix is available in the mainline kernel, we'll backport the fix into
oem-6.8 kernel and revert the workaround patches, as well as submit them to Oracular.

Upstream bug: https://gitlab.freedesktop.org/drm/intel/-/issues/9739

Upstream patch submission:
https://patchwork.freedesktop.org/series/137524/

[Fix]
Apply workaround patches from oem-6.5 to oem-6.8

*** Update ***
For oem-6.11, cherry-pick two upstream fixes currently in linux-next:

a13494de5325 drm/i915/display: Increase Fast Wake Sync length as a quirk
43cf50eb1408 drm/i915/display: Add mechanism to use sink model when applying quirk

[Test Plan]
The machines mentioned in the attachment (containing the problematic panel's EDID) would have flickering graphics with the linux-6.8.0-1006-oem kernel.

The flickering graphic is gone after applying the workaround patches.

[Where problems could occur]
The workaround patches add some quirks that disable PSR2 on some panels. So far, there are 7 panels listed in the quirks (other panels used by OEM products are flickering-free without the patches).

If OEM starts using other panels in the future, it's not sure that the
panels will be flickering-free.

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