Comment # 10 on bug 1201398 from Yakun Li

(In reply to Stefan Dirsch from comment #8)
> (In reply to Stefan Dirsch from comment #7)
> > Apparently this is a Optimus system (intel+ nvidia grahics combo). The
> > easiest would be to disable nvidia in the BIOS/Firmware. But I don't know
> > whether this is possible. But this should be checked first.
> 
> If possible uninstall nvidia driver packages of course and reboot once more.

I kind of already did this, by removing nvidia 05 related libraries, and
installed nvidia 06 related libraries, but the bug still exists.