* [Bug 213715] New: failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux
@ 2021-07-13 16:27 bugzilla-daemon
2021-07-13 16:29 ` [Bug 213715] " bugzilla-daemon
2021-07-20 16:08 ` bugzilla-daemon
0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2021-07-13 16:27 UTC (permalink / raw)
To: dri-devel
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] failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux
2021-07-13 16:27 [Bug 213715] New: failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux bugzilla-daemon
@ 2021-07-13 16:29 ` bugzilla-daemon
2021-07-20 16:08 ` bugzilla-daemon
1 sibling, 0 replies; 3+ messages in thread
From: bugzilla-daemon @ 2021-07-13 16:29 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=213715
--- Comment #1 from Pengyu Ma (mapengyu@gmail.com) ---
Created attachment 297821
--> https://bugzilla.kernel.org/attachment.cgi?id=297821&action=edit
4k display edid
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* [Bug 213715] failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux
2021-07-13 16:27 [Bug 213715] New: failed to change brightness of HDR panel on AMD GREEN_SARDINE through aux bugzilla-daemon
2021-07-13 16:29 ` [Bug 213715] " bugzilla-daemon
@ 2021-07-20 16:08 ` bugzilla-daemon
1 sibling, 0 replies; 3+ messages in thread
From: bugzilla-daemon @ 2021-07-20 16:08 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=213715
mario.limonciello@amd.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mario.limonciello@amd.com
--- Comment #2 from mario.limonciello@amd.com ---
I would suggest to work with BOE and CSO to fix the DPCD values in panel
firmware to not report aux control if it is not functional.
You can see the kernel checks the DPCD to determine whether to use AUX or PWM.
https://github.com/torvalds/linux/blob/c010efb7f0bc0c3cb2cd26b000f71d4bd0c427cd/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c#L2433
BTW this behavior has been also been reported in the past, so a heuristic may
be introduced at some point in the future for the buggy panel firmware:
https://gitlab.freedesktop.org/drm/amd/-/issues/1438
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