link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
return false;
- if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
- (uint8_t *) backlight_millinits,
- sizeof(uint32_t)))
- return false;
+ if (!link->dpcd_caps.panel_luminance_control) {
+ if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
+ (uint8_t *)backlight_millinits,
+ sizeof(uint32_t)))
+ return false;
+ } else {
+ //setting to 0 as a precaution, since target_luminance_value is 3 bytes
+ memset(backlight_millinits, 0, sizeof(uint32_t));
+
+ if (!core_link_read_dpcd(link, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE,
+ (uint8_t *)backlight_millinits,
+ sizeof(struct target_luminance_value)))
+ return false;
+ }
return true;
}