ACK/Cmnt: [v2][SRU][PATCH 0/2][J/OEM-5.17/K/U] Fix blank screen on Thinkpad ADL 4K+ panel

Stefan Bader stefan.bader at canonical.com
Mon Oct 10 12:53:10 UTC 2022


On 10.09.22 02:16, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/1980621
> 
> [Impact]
> Set screen off on ThinkPad P1G5 with 4k+ panel.
> The screen will never be back.
> 
> [Fix]
> Reload link rate as WA to fix the issue.
> 
> [Test]
> Verified on hardware, screen on/off 20 times OK.
> 
> [Where problems could occur]
> It may break DP output on Intel platform.
> 
> Ville Syrjälä (2):
>    drm/i915: Implement WaEdpLinkRateDataReload
>    Revert "drm/i915/display: Re-add check for low voltage sku for max dp
>      source rate"
> 
>   drivers/gpu/drm/i915/display/intel_dp.c       | 32 ++-----------------
>   .../drm/i915/display/intel_dp_link_training.c | 22 +++++++++++++
>   2 files changed, 25 insertions(+), 29 deletions(-)
> 
The patch #1 (for Jammy) is now upstream:

commit 672d6ca758651f0ec12cd0d59787067a5bde1c96
Author: Ville Syrjälä ville.syrjala at linux.intel.com
Date:   Fri Sep 2 10:03:18 2022 +0300
   drm/i915: Implement WaEdpLinkRateDataReload

I would propose to cherry pick the upstream patch and add bug report and sob 
when applying.

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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