Screen brightness very dim on a Dell XPS 13 (2013)

Question

I just installed Xubuntu 13.04 on a new Dell XPS 13 Ultrabook. When I boot up the screen brightness is EXTREMELY dim. Adjusting the screen brightness doesn't do anything. This is obviously a very new bug with 13.04.

Any ideas?

score 0 · Answer 1 · edited Mar 13 '17 at 20:11

0

here are a couple kernel boot parameters you can try

acpi_osi=Linux
acpi_backlight=vendor
acpi_osi='!Windows 2012'

This is there you add that code, I had to use the 3ed one to get mine working right, it may be necessary to use 1 or 3 combined with the second one
The file to edit is :
/etc/default/grub
once you edit it run sudo update-grub then reboot

edited Mar 13 '17 at 20:11

Seth

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answered Apr 27 '13 at 02:55

GM-Script-Writer-62850

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never ever seen acpi_osi='!Windows 2012' ... – Qasim Apr 27 '13 at 03:33
i got it from a kernel dev [here](https://bugzilla.kernel.org/show_bug.cgi?id=55161#c15) – GM-Script-Writer-62850 Apr 27 '13 at 03:44
i did google ...ty for updating the information... – Qasim Apr 27 '13 at 03:45

score 0 · Answer 2 · answered Sep 07 '13 at 13:19

Along with @GM-Script-Writer-62850's answer, if you're using an EFI BIOS boot, you ned to go into the BIOS setup and set "Load Legacy Rom" to Enabled.

I have experimented with the minimal GRUB line to get this working and I only need acpi_osi=Linux

AFAIK Legacy is anything not Windows 8, and I've not experienced any performance hit.

Screen brightness very dim on a Dell XPS 13 (2013)

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