https://bugzilla.kernel.org/show_bug.cgi?id=153401
Bug ID: 153401
Summary: REGRESSION: Dell XPS 13 ACPI screen brigthness
regression
Product: ACPI
Version: 2.5
Kernel Version: 4.7.x
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Since I've upgraded to linux 4.7, if I set the screen brightness to any value
other than 100% (with either fn keys or gnome sliders) it starts flashing from
the brightness level I've set (e.g. 50%) to 100% and back. It's a combination
of both flash and smooth up and down continuous adjustments. I've tried with
the kernel parameters suggested in the arch wiki and with acpi_backlight=video
or acpi_backlight=vendor the backlight control does not work, whereas with
acpi_backlight=native I have the same behavior as described above (flashing).
Any ideas? This happens on a Dell XPS 13 (old ivybridge model).
Also, after issuing this command (I've found some suggestions to old similar
problems), pressing the fn keys, the level (and the indicators) are stuck to
100%:
sudo chmod u-w /sys/class/backlight/intel_backlight/brightness
Downgrading to linux 4.6.x fixes the issue. So it looks like it's a regression
bug.
With linux 4.7.x:
$ ls /sys/class/backlight/
intel_backlight
With linux prior to 4.7 (e.g. 4.6.x)
$ ls /sys/class/backlight/
acpi_video0
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