[SRU] [H/I/OEM-5.10/OEM-5.13] [PATCH 0/1] Fix display output on HP hybrid GFX laptops

Kai-Heng Feng kai.heng.feng at canonical.com
Thu Jul 15 07:11:15 UTC 2021

BugLink: https://bugs.launchpad.net/bugs/1936296

Video output MUX switched from Intel GPU to Nvidia GPU after S3, so
display settings are lost.

Always use Nvidia GPU to do the video output. This matches the behavior
on the other OS.

Connect and external monitor, and change the scaling factor or
resolution, suspend the laptop.
After wakeup, the custom monitor setting is kept.

[Where problems could occur]
If nvidia.ko or nouveau.ko is blacklisted, the video output may stop
working, as it's now routed away from i915 device.

Kai-Heng Feng (1):
  drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops

 drivers/gpu/drm/i915/display/intel_acpi.c     | 19 +++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_acpi.h     |  3 +++
 drivers/gpu/drm/i915/display/intel_opregion.c |  3 +++
 3 files changed, 25 insertions(+)


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