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Patch to make backlight work for nocturne/Pixel Slate (and maybe also eve) with linux kernel 5.12
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| diff -Npaur a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | |
| --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c 2021-05-07 18:57:14.612178675 -0400 | |
| +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c 2021-05-07 18:58:15.107279925 -0400 | |
| @@ -593,7 +593,6 @@ intel_dp_aux_supports_vesa_backlight(str | |
| * work just fine using normal PWM controls anyway. | |
| */ | |
| if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP && | |
| - (intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) && | |
| (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) { | |
| drm_dbg_kms(&i915->drm, "AUX Backlight Control Supported!\n"); | |
| return true; |
(Based upon [PATCH v12 2/3] drm/i915: Add heuristic to determine better way to adjust brightness and also what is currently in the ChromeOS 5.4 kernel and what is currently in the ChromeOS 4.4 kernel.
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Rationale: DPCD Backlight check wants PWM enabled, but PWM is not connected on nocturne or eve. The solution is to change that check, as mentioned here.