Comment 25 for bug 1307069

On 28-10-15 06:31:17, Martin Pitt wrote:
> So, let's try this again: What is this grepping of syslogs trying to do?
> Can we replace this with checking for presence/absence of
> /sys/module/<name>?
>

The module can be loaded on boot and then it can (automatically) be
unloaded (at some point) if the GPU is disabled in a hybrid system. When
that happens, we have no way of telling a system where the discrete GPU
was disabled from one where the GPU is not there (e.g. disabled from the
BIOS, dead, or simply not there).

Both fglrx and nvidia print a line with the BusID of the device when
they are loaded. Gpu-manager collects the BusID from the log and adds it
to the list of available devices.

You can see an example of their output in set_unloaded_module_in_dmesg()
in tests/gpu-manager.py.

Please keep in mind that, at least for nvidia, gpu-manager needs to run
on log out too, not only on boot.

What do you recommend that we use?