Hi!
> 1) user owns graphics devices
> 2) user sets mode with string (or similar) format using ioctl common to
> all drivers.
> 3) driver is locked to prevent multiple mode sets
> 4) common code takes this string and does a hotplug event with it.
I though this was
"Driver decides to either do it itself in kernel, or call userspace
helper if that would be too complex".
> How are errors going to be communicated in this scheme? I can cat the
> sysfs mode variable to get a status. Is there a good way to do this
> without polling?
I'd say that write() to that sysfs file can simply return error. See
echo disk > /sys/power/state, it returns error if transition failed.
Pavel
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