I have an ASUS X552CL with a nvidia gforce 710M and the bug appeared
when I was using Ubuntu Gnome 14.04.1. I installed nvidia-331 drivers
with bumblebee (my laptop has two video cards, Intel and Nvidia)
(trought this video https://www.youtube.com/watch?v=nMqVFeFk9rI) and all
works fine but a week after I couldn't use brightness control neither
the keyboard nor gnome settings (the indicator dissapeared!).
After this, I installed Ubuntu 14.04.1 (original) and all works fine but
when I installed bumblebee and all necesary packs to use my two video
cards, the brightness indicator disappeared again, and keys of
brightness control didn't work.
I tryed to fix it trought:
1) Fist fix:
At first, I write this to know which video card manage the bright of my
display
ls /sys/class/backlight/
acpi_video0 acpi_video1 intel_backlight
After this I created a configuration file to intel videocard with:
sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
And I added the next parameters:
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
I rebooted my laptop and brightness control still didn't work.
Source (In spanish, sorry): http://www.atareao.es/ubuntu/corrigiendo-el-
brillo-en-ubuntu-trusty-tahr/
2) Second fix: the same fix that Arizsló, but didn't work.
3) Third fix:
I change the drivers from nvidia-331 to nvidia-340 and the brightness
control still didn't work.
Now, I only use intel videocard to brightness control works.
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1342786
Title:
Brightness OSD killed by nvidia-prime
Status in “nvidia-prime” package in Ubuntu:
Confirmed
Bug description:
Installed Ubuntu 14.04 64 bit on an Acer Aspire 5750ZG Nvidia Optimus
laptop.
There was no issue with brightness until I installed the nvidia-prime
package: I could adjust brightness in System Settings as well as with
the brightness keys (Fn+left/right arrows). The brightness on-screen
display used to appear fine on the screen while adjusting brightness
with the function keys.
After I had installed nvidia-prime, I could still adjust brightness in
System Settings but no longer with the brightness keys. The osd
disappeared, too.
Adding acpi_osi=Linux to GRUB_CMDLINE_LINUX_DEFAULT in
/etc/default/grub fixed the brightness keys but did not bring back the
osd.
Removing nvidia-prime did not help. The osd was lost for good.
Reinstalled Ubuntu 14.04 formatting the / partition and now everything
is fine again. Installed bumblebee with nvidia-331 and still
everything is fine.
The nvidia-prime packages seems to do something that breaks both the
brightness keys (which can be fixed with acpi_osi=Linux) and the osd
(which I could not bring back).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1342786/+subscriptions
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