New subject: [Bug 213715] failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux

13 Jul 2021

      https://bugzilla.kernel.org/show_bug.cgi?id=213715
Bug ID: 213715
           Summary: failed to change brightness of HDR panel on AMD
                    GREEN_SARDINE through aux
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.14.0-rc1+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mapengyu@gmail.com
        Regression: No
Created attachment 297819
  --> https://bugzilla.kernel.org/attachment.cgi?id=297819&action=edit
dmesg
HW: ThinkPad P14s gen 2a
CPU: AMD Ryzen 7 PRO 5850U with Radeon Graphics
Panel: BOE 2434 and  CSO 5127
brightness can't be controlled through AUX.
It works with parameter "amdgpu.backlight=0"
dmesg attached.
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[Bug 213715] New: failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux