The PCI device will exist whether or not the module was loaded; so you
can just iterate over /sys/bus/pci/devices/* (* expands to the PCI bus
IDs) and check the attributes in each directory; e. g. you probably want
to pick out the ones with class == 0x030000 (graphics card), and perhaps
vendor == 10DE (nvidia).
If you want to do that via an udev rule: I'm not entirely sure which
kinds of events you get when the nvidia driver gets loaded. You can
unload it, run
udevadm monitor -e --udev
then load it, and see what kind of events you get. For sure you'll see
an "add" event for SUBSYSTEM=="module", DEVPATH=="*/nvidia", but either
on boot or when loading the module you should also see an "add" or
"change" event for the graphics card itself.
This is an initial sketch of a rule which selects a PCI card whose
driver is nvidia:
ACTION=="add|change", SUBSYSTEM=="pci", DRIVER=="nvidia*", RUN+=
"touch /run/nvidia-loaded-for-pci-id-$env{PCI_ID}"
(using "nvidia*" here in case the modules might be called something like
nvidia_123). You can use udev properties like $env{PCI_ID} and also
attributes from sysfs like the above, with e. g. $attr{vendor}. See man
udev(7) for other macros you can use in RUN clauses.
Then you don't need the "remove" rule any more -- if /sys/modules/nvidia
does not exist but your stamp in /run does exist, you know that it was
once loaded but then removed.
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https://bugs.launchpad.net/bugs/1307069
Title:
gpu-manager causing long startup delays
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