Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Low
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Low
Status: Confirmed
** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided
Status: New
** 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
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https://bugs.launchpad.net/bugs/1907285
Title:
Drop i915 PSR workarounds
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.10 source package in Focal:
Confirmed
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1907285/+subscriptions
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