diff options
| author | Dave Airlie <airlied@redhat.com> | 2025-07-04 03:06:22 +0300 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2025-07-04 03:06:29 +0300 |
| commit | 7e2818386aad54ba5ab70e228c555814d33bdad1 (patch) | |
| tree | 7ab8ff537b23fd2338643042625991d6c44dbe5c /Documentation/gpu | |
| parent | f41830c57bb8e70e283b9db251c95f1270a8279d (diff) | |
| parent | 2ecdb61f76ebd3b2fd0a7a41421f9c4df206e802 (diff) | |
| download | linux-7e2818386aad54ba5ab70e228c555814d33bdad1.tar.xz | |
Merge tag 'amd-drm-next-6.17-2025-07-01' of https://gitlab.freedesktop.org/agd5f/linux into drm-next
amd-drm-next-6.17-2025-07-01:
amdgpu:
- FAMS2 fixes
- OLED fixes
- Misc cleanups
- AUX fixes
- DMCUB updates
- SR-IOV hibernation support
- RAS updates
- DP tunneling fixes
- DML2 fixes
- Backlight improvements
- Suspend improvements
- Use scaling for non-native modes on eDP
- SDMA 4.4.x fixes
- PCIe DPM fixes
- SDMA 5.x fixes
- Cleaner shader updates for GC 9.x
- Remove fence slab
- ISP genpd support
- Parition handling rework
- SDMA FW checks for userq support
- Add missing firmware declaration
- Fix leak in amdgpu_ctx_mgr_entity_fini()
- Freesync fix
- Ring reset refactoring
- Legacy dpm verbosity changes
amdkfd:
- GWS fix
- mtype fix for ext coherent system memory
- MMU notifier fix
- gfx7/8 fix
radeon:
- CS validation support for additional GL extensions
- Bump driver version for new CS validation checks
From: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20250701194707.32905-1-alexander.deucher@amd.com
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'Documentation/gpu')
| -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 |