[SRU][OEM-5.14/Jammy/OEM-5.17][PATCH 0/1] Fix blank screen on Thinkpad ADL 4K+ panel

[Timo Aaltonen]

Aaron Ma kirjoitti 4.7.2022 klo 8.15:
> BugLink: https://bugs.launchpad.net/bugs/1980621
> 
> [Impact]
> Set screen off on ThinkPad P1G5 with 4k+ panel.
> The screen will never be back.
> 
> [Fix]
> It's a upstream kernel regression.
> And reverted by upstream.
> 
> [Test]
> Verified on hardware, screen on/off 20 times OK.
> 
> [Where problems could occur]
> Low risk, it reverts a regression and may break i915 driver.
> 
> On 5.14-oem and Jammy kernel, This commit was claimed to backport
> commit 73867c8709b5 ("drm/i915/display: Remove check for low voltage sku for max dp source rate")
> But it's not kind of it.
> So revert it instead.
> 
> On 5.17 kernel, revert it by upstream commit.
> 
> Unstable kernel already got it.
> 
> Jason A. Donenfeld (1):
>    drm/i915/display: Re-add check for low voltage sku for max dp source
>      rate
> 
> Aaron Ma (1):
>    UBUNTU: SAUCE: Revert "drm/i915/display: Remove check for low voltage
>      sku for max dp source rate"
> 
>   drivers/gpu/drm/i915/display/intel_dp.c | 32 ++++++++++++++++++++++---
>   1 file changed, 29 insertions(+), 3 deletions(-)
> 

this will essentially reopen bug 1967986




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