[PATCH 0/2][Noble] Support AMD Adaptive Backlight Management (ABM) for power profiles daemon >= 2.0

[You-Sheng Yang]

BugLink: https://bugs.launchpad.net/bugs/2056716

[Impact]

power-profiles-daemon >= 2.0 now utilizes AMD GPU panel_power_savings
sysfs entry to set desired panel power saving level. Related kernel
fixes are to be released in v6.9.

[Fix]

Two linux-next committed fixes are required. The first one introduces
panel_power_savings sysfs entry itself, and the second one extends
abmlevel sysfs entry to allow an auto mode.

[Test Case]

1. Check existence of panel_power_savings sysfs entry:

   $ cat /sys/class/drm/card0-eDP-1/amdgpu/panel_power_savings
   -1

2. Remove power cable and switch between power profiles from Power
Management settings. The content of above panel_power_savings sysfs
entry should be updated correspondingly.

[Where problems could occur]

While the abmlevel entry now has a different default value that allows
automatic power management, the behavior may differ from users'
expectation.

[Other Info]

power-profiles-daemon >= 0.20 is only available on Noble or later at
this moment, so only Noble/Unstable will be nominated for fix.

Hamza Mahfooz (2):
  drm/amd/display: add panel_power_savings sysfs entry to eDP connectors
  drm/amdgpu: respect the abmlevel module parameter value if it is set

 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       | 11 ++-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 92 ++++++++++++++++++-
 3 files changed, 95 insertions(+), 10 deletions(-)

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2.43.0