Public bug reported:
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).
** Affects: nvidia-prime (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1342786
Title:
Brightness OSD killed by nvidia-prime
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