Patch forcing DPCD backlight on Pixelbook

dpcd-eve.patch

diff --git i/drivers/gpu/drm/i915/intel_dp_aux_backlight.c w/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index 357136f17..7de91a4a5 100644
--- i/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ w/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -252,8 +252,12 @@ intel_dp_aux_display_control_capable(struct intel_connector *connector)
         * the panel can support backlight control over the aux channel
         */
        if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP &&
-           (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP) &&
-           !(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) {
+           (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)
+/* for Pixelbook - simpler version of https://patchwork.kernel.org/patch/9618065/ */
+#if 0
+            && !(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)
+#endif
+                       ) {
                DRM_DEBUG_KMS("AUX Backlight Control Supported!\n");
                return true;
        }