On 3/23/2026 10:39 AM, Alex Deucher wrote:
LVDS connectors don't have extended backlight caps so check
if the pointer is valid before accessing it.
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/5012
Fixes: 1454642960b0 ("drm/amd: Re-introduce property to control adaptive backlight
modulation")
Cc: Mario Limonciello <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 0955c2318ef2f..a347f48e3cd89 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5417,7 +5417,7 @@ static void setup_backlight_device(struct
amdgpu_display_manager *dm,
caps = &dm->backlight_caps[aconnector->bl_idx];
/* Only offer ABM property when non-OLED and user didn't turn off by module parameter */
- if (!caps->ext_caps->bits.oled && amdgpu_dm_abm_level < 0)
+ if (caps->ext_caps && !caps->ext_caps->bits.oled && amdgpu_dm_abm_level
< 0)
drm_object_attach_property(&aconnector->base.base,
dm->adev->mode_info.abm_level_property,
ABM_SYSFS_CONTROL);
Cc: [email protected]
Reviewed-by: Mario Limonciello (AMD) <[email protected]>
