Comment 67 for bug 1310489

On 08-09-14 08:27:54, Philipp Commans wrote:
> Hallo Alberto!
>
> I found the time do delete the Catalyst drivers (AMD installer) and reinstall fglrx from the repositories.
> I also reinstalled ubuntu-drivers-common from the proposed-archive just to make sure.
>
> Some testing showed the following results:
> Configuration via "sudo aticonfig --adapter=all --initial -f" is successfull. Amdcccle shows the right graphics cards information.
> The discrete card is activated by default.
> But when I switch cards via amdcccle or aticonfig the X-Server crashes at restart with error:
> "No matching device section for instance (BusID PCI:0@0:1:1)"
> Rewritting the xorg.conf with aticonfig makes the X-Server startable again.
> This error also appeared with the drivers from the AMD installer before.
>

The last fix I committed in 14.10 should fix this.

> The gpu-manager still does not seem to be working. Should the /var/log/gpu-manager normally be rewritten on each boot?
> That's definitely not the case, according to the last modification time.
>
> Can you give me any advice on how to find out what could possibly be blacklisting gpu-manager or stopping it from working?
> When I start gpu-manager manually the log gets rewritten.
>
> Could the X-server-crash be linked with the deactivated gpu-manager?
>

Yes, the log should be rewritten at least on boot. If it's not, it means that the gpu-manager is not starting. For some reason the gpu-manager upstart job (/etc/init/gpu-manager.conf) must not be starting on your system.

No gpu-manager means that the system won't adapt when you switch to a different driver or when something goes wrong (and you'll have to configure things manually).