The PWM brightness level of Dell XPS 13 (2015) is from 10 to 937 however the sysfs brightness level always starts from 0 so it is better to use 927 as the sysfs maximum brightness level and it becomes easier to map from the PWM brightness level to the sysfs brightness level. Signed-off-by: Shih-Yuan Lee (FourDollars) <sylee@xxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_panel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index a24df35..697fd4d 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -1211,7 +1211,7 @@ static int intel_backlight_device_register(struct intel_connector *connector) * Note: Everything should work even if the backlight device max * presented to the userspace is arbitrarily chosen. */ - props.max_brightness = panel->backlight.max; + props.max_brightness = panel->backlight.max - panel->backlight.min; props.brightness = scale_hw_to_user(connector, panel->backlight.level, props.max_brightness); -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
