Bug#775012: nvidia-driver: startx initializes nvidia driver but kdm does not

[Andreas Beckmann]

Control: tag -1 moreinfo

On Fri, 9 Jan 2015 17:57:08 -0600 <ntrfug at cox.net> wrote:
> I installed Jessie on a Lenovo W530 with BIOS set to NVIDIA Optimus and
> OS Detection enabled.
> 
> I wanted to use the NVIDIA discrete graphics so I changed the BIOS to
> Discrete Graphics with OS detection disabled, and installed
> nvidia-driver from the repository. I edited /etc/default/grub to add
> the kernel options "nox2apic rcutree.rcu_idle_gp_delay=1".
> 
> This worked through several reboots, for about a day. After that the
> machine froze when the NVIDIA logo should have appeared: the screen
> backlight turned off, the hard drive stopped spinning, and the only
> action that had effect was holding the power button down to power off.
> 
> When I rebooted in single-user mode I discovered I could startx as
> root. The NVIDIA logo appeared, then the kdm login screen. Once I had
> logged in I could log out, kdm would restart, and I could log in
> normally. This lasted about a day, then kdm would not re-start after I
> ended a root session.
> 
> I purged (not removed) *everything* related to NVIDIA, and
> re-installed. I was able to boot normally just ONCE.
> 
> I disabled kdm so I could startx with logverbose 6 and capture the
> failure. Instead kdm started normally.
> 
> The Xorg.0.log below is from starting as a normal user at the console;
> Xorg.0.log.old is the result of trying to boot normally straight to kdm.

Is this issue still present with the latest drivers in
stable/unstable/experimental? (375.xx or newer). There is no more kdm in
stable nowadays ...

Andreas