Hi,
Brightness controls work on Ubuntu 12.04 with the raring ringtail kernel
3.8 and the liquorix kernel. 3.12.6. But for the system to launch with
the brightness on, the user has to edit /etc/default/grub and change
this line like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
On Ubuntu 13.10, the brightness controls do not work with these kernel
versions. Changing GRUB_CMDLINE_LINUX_DEFAULT also doesn't work.
- kernel 3.11 (the default one)
- kernel 3.12.6 (installed with these instructions)
- kernel 3.12.6 liquorix
Also, /sys/class/backlight is empty on 13.10, while on 12.0.4.3 it has
two folders "acpi_video0" and "intel_backlight"
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1258058
Title:
10de:0fe4 [Lenovo IdeaPad Y510P] Brightness control no effect on
screen
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