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

[Koba Ko]

On Mon, Jul 4, 2022 at 10:06 PM Aaron Ma <aaron.ma at canonical.com> wrote:
>
>
>
> 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.

Thanks, once get the positive result, I will sru it if it's landed in upstream.

> Aaron
>
> >>
> >> --
> >> t
>