Hi,
On 11-01-15 07:16, Matthew Garrett wrote:
On Mon, Jan 05, 2015 at 08:57:04AM +0100, Hans de Goede wrote:
The L521X variant of the Dell XPS15 has integrated nvidia graphics, and
backlight control does not work properly when using the native interfaces.
I'm not convinced that the assessment of this bug is correct. Is the
system using the nvidia graphics device?
I do not know.
If so, why is userspace writing to the intel backlight device?
Userspace is writing to the intel_backlight device because it is the
only one present under /sys/class/backlight, as we disable acpi-video
on win8 ready laptops by default now.
What this commit does is disable the disabling of acpi-video, and
after that userspace will see an acpi_video0 backlight under
/sys/class/backlight, use that and then things work, this has been
confirmed by the bug reporter.
The commit message may not be 100% accurate, although I believe this is
related to the laptop having nvidia graphics, but the code / fix is correct
regardless.
Regards,
Hans
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