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Update README with module options

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Lekensteyn 2012-01-14 22:49:46 +01:00
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README.md
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@ -68,6 +68,39 @@ Do **not** attempt to load a driver while the card is off or the card won't be
usable until the PCI configuration space has been recovered (for example, after
writing the contents manually or rebooting).
### Module options
The module has some options that control the behavior on loading and unloading:
`load_state` and `unload_state`. Valid values are `-1`, `0` and `1` meaning "do
not change the card state", "turn the card off" and "turn the card on"
respectively. For example, if you want to have `bbswitch` disable the card
immediately when loading the module while disabling the card on unload, load the
module with:
# modprobe bbswitch load_state=0 unload_state=1
The `unload_state` value can be changed on runtime, the above command yields the
same behavior as:
# modprobe bbswitch load_state=0
# echo 1 | tee /sys/module/bbswitch/parameters/unload_state
If not explictly set, the default behavior is not to change the power state of
the discrete video card which equals to `load_state=-1 unload_state=-1`.
### Disable card on boot
These options can be useful to disable the card on boot time. Depending on your
distribution, `/etc/modules`, `/etc/modules.conf` or some other file can be used
to load modules on boot time. Adding the below line to the file makes the card
get disabled on boot:
bbswitch load_state=0
You have to update your initial ramdisk (initrd) for the changes propagate to
the boot process. On Debian and Ubuntu, this can performed by running
`update-initramfs -u` as root.
Reporting bugs
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