** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-6.5 in Ubuntu.
https://bugs.launchpad.net/bugs/2046315
Title:
oem-6.5: disable psr2 for some panels according to edid
Status in HWE Next:
New
Status in linux package in Ubuntu:
New
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
New
Status in linux-oem-6.5 source package in Jammy:
New
Bug description:
BugLink: https://bugs.launchpad.net/bugs/2046315
[Impact]
On serveral Dell laptops, the screen often displays garbage or the screen is
flicking
[Fix]
There is no real fix so far, ODM recommends to use a workaround to disable
PSR2, this is a temp solution, after we get the real fix, we could revert the
temp workaround.
[Test case]
booting with the patched kernel, If the pannel's edid is in the qurik
list, the PSR2 will be disabled (checking
/sys/kernel/debug/dri/0/i915_edp_psr_status; if the pannel's edid is
not in the quirk list, the graphic driver will work as before.
[Where problems could occur]
It is possible that the temp solution couldn't work, then the screen will
still show garbage and the screen is flicking, another possible regression is
the screen has no problem before, but after running patched kernel, the PSR2 is
disabled and the system cost more power, but this possibility is very low, I
tested the patched on some dell machines, all worked well.
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