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) <sy...@canonical.com>
---
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
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