[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 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

@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/

>
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> t