[elrepo] Today's nvidia 340xx update

[Konstantin Olchanski]

On Mon, Aug 03, 2015 at 01:30:43PM -0500, Graham Allan wrote:
> I've had a handful of machines update their nvidia driver and after
> reboot X no longer works.
> 
> I notice that kmod-nvidia updated to kmod-nvidia-340xx-340.76-2 but
> the x11 driver stayed at nvidia-x11-drv-340xx-340.76-1. Could that be a
> problem? Downgrading the kmod to kmod-nvidia-340xx-340.76-1 gets things
> working again.
> 
> Is it an oversight that there's no 340.76-2 x11 driver, or am I looking
> in the wrong place for my issue?
> 

This problem had existed for years - new drivers are installed, Xorg loads them
then barfs on version mismatch against the old nvidia.ko kernel module that
nobody bothered to unload.

I looked at fixing this myself, but all the complicated Xorg started scripts do not
provide any hooks at all that run before Xorg is started. After Xorg is started,
it crashes right away so none of the post-Xorg scripts will not run. So there is no
place to put the crucial "rmmod nvidia.ko" command. So I failed.

elrepo X11 people probably know more about the Xorg startup scripts, but in all these years they have not fixed this problem.

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada