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

[Aaron Ma]

On 7/4/22 16:36, Koba Ko wrote:
> On Mon, Jul 4, 2022 at 2:10 PM Timo Aaltonen <tjaalton at ubuntu.com> wrote:
>> 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

Yes, it's supposed to be fixed by patch below.

> @Aaron, would you please try this test kernel?
> https://drive.google.com/drive/folders/1OAqP_SLwqoLNkVg6JtfJE-VNsLRtFdxp?usp=sharing
>
> Reverted 73867c8709b5 and applied this,
> https://patchwork.freedesktop.org/series/105573/

This patch is already be verified, it doesn't affect this SRU.
I can't verify the bug 1967986, please try to SRU it if it's landed in upstream.

Aaron

>>
>> --
>> t