Drop i915 PSR workarounds

Bug #1907285 reported by Kai-Heng Feng
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Confirmed
Low
Unassigned
Focal
Won't Fix
Undecided
Unassigned
linux-oem-5.10 (Ubuntu)
Invalid
Undecided
Unassigned
Focal
Fix Released
Low
Unassigned

Bug Description

[Impact]
Disabling PSR helps some platforms but breaks others. So let's not play
this whack-a-mole game.

In addition to that, PSR can provide significant power saving, let Intel
SoC reach PC10 or even SLP_S0 withouth turning screen off.

[Fix]
Drop PSR workaround and stick to upstream code.

[Test]
Monitor numbers in /sys/kernel/debug/pmc_core/*

With PSR enabled, some Tiger Lake laptops can reach SLP_S0 without
turning screen off.

[Regression Potential]
Panels that don't work well with PSR may break again. If that ever
happens, we can introduce a blacklist on panels.

Changed in linux (Ubuntu Focal):
status: New → Won't Fix
Changed in linux-oem-5.10 (Ubuntu):
status: New → Invalid
Changed in linux (Ubuntu):
status: New → Confirmed
Changed in linux-oem-5.10 (Ubuntu Focal):
status: New → Confirmed
Changed in linux (Ubuntu):
importance: Undecided → Low
Changed in linux-oem-5.10 (Ubuntu Focal):
importance: Undecided → Low
Timo Aaltonen (tjaalton)
Changed in linux-oem-5.10 (Ubuntu Focal):
status: Confirmed → Fix Committed
Timo Aaltonen (tjaalton)
tags: added: verification-needed-focal
tags: added: verification-done-focal
removed: verification-needed-focal
Timo Aaltonen (tjaalton)
Changed in linux-oem-5.10 (Ubuntu Focal):
status: Fix Committed → Fix Released
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