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| author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2025-09-10 08:01:42 -0400 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2025-09-10 08:01:42 -0400 |
| commit | 702fdf3513b045f596f836d9a4b8672c76f11834 (patch) | |
| tree | 4034b3baf8db7119ab738ac5bd6fcbeb890fea94 /Documentation/gpu/amdgpu/debugging.rst | |
| parent | b69f8c496ea05f80c2bae91a74b48c00c06c524e (diff) | |
| parent | 4bf83dd6e3b3b2a131e357f035b17edaee6f6766 (diff) | |
Merge drm/drm-next into drm-intel-next
Catching up with some display dependencies.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'Documentation/gpu/amdgpu/debugging.rst')
| -rw-r--r-- | Documentation/gpu/amdgpu/debugging.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/gpu/amdgpu/debugging.rst b/Documentation/gpu/amdgpu/debugging.rst index 7cbfea0606e1..ac914d524741 100644 --- a/Documentation/gpu/amdgpu/debugging.rst +++ b/Documentation/gpu/amdgpu/debugging.rst @@ -85,3 +85,21 @@ UMR GPU debugging and diagnostics tool. Please see the umr `documentation <https://umr.readthedocs.io/en/main/>`_ for more information about its capabilities. + +Debugging backlight brightness +============================== +Default backlight brightness is intended to be set via the policy advertised +by the firmware. Firmware will often provide different defaults for AC or DC. +Furthermore, some userspace software will save backlight brightness during +the previous boot and attempt to restore it. + +Some firmware also has support for a feature called "Custom Backlight Curves" +where an input value for brightness is mapped along a linearly interpolated +curve of brightness values that better match display characteristics. + +In the event of problems happening with backlight, there is a trace event +that can be enabled at bootup to log every brightness change request. +This can help isolate where the problem is. To enable the trace event add +the following to the kernel command line: + + tp_printk trace_event=amdgpu_dm:amdgpu_dm_brightness:mod:amdgpu trace_buf_size=1M |