On 11/03/2011 12:38 PM, Bryce Harrington wrote:
On Thu, Nov 03, 2011 at 12:08:53PM -0400, Christopher James Halse Rogers wrote:
On Thu, 2011-11-03 at 08:50 -0700, Bryce Harrington wrote:
Would it make sense to make that into a udev rule?
I'm not sure that a udev rule would have the necessary context, but
either a udev rule or an upstart script would absolutely make sense.
Would any context be needed beyond loaded kernel gfx driver(s) and
machine identification info?
I don't believe so, no. But if we're writing a udev rule that needs to
be triggered on a udev event, and I'm not sure whether there's a udev
event that we can rely on to happen at an appropriate time.
Right?
At this point we should probably talk to slangasek about it.
Bryce
While vga_switcheroo may be sufficient for turning off the Nvidia GPU,
it is a a one-way trip for some Optimus laptops with the PEGP _DSM until
a reboot. The card can be reenabled, but the kernel module won't
reinitialize.
To that end, Alex Williamson (byo-switcheroo - requires specific ACPI
calls) and Peter Lekensteyn (bbswitch - WIP; general ACPI calls) have
been working on methods that save the card's state via PCI.
https://github.com/Lekensteyn/acpi-stuff/blob/master/bbswitch/bbswitch.c
https://github.com/awilliam/asus-switcheroo/blob/master/byo-switcheroo.c
- Eric
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