On Thu, Nov 03, 2011 at 09:29:02AM -0400, Christopher James Halse Rogers wrote: > > > > > > However, we talked about powering off the discrete card as well. My > > > recollection is that the X team was planning to look into that, but > > > there are unknowns about how and when we can do that. > > > > Chris was given a system that exhibits this problem, so we've had a > > chance to review it as well. We've spoken to the kernel team about the > > issue and I think a fix should be forthcoming down the pike. Chris can > > fill in mroe. > > Simply writing "OFF" to /sys/kernel/debug/vgaswitcheroo/switch will turn > off the unconnected GPU on the system I've been playing with - and cuts > idle power consumption by > 50%. > > For this particular system this is entirely safe - the radeon card isn't > hooked up to any outputs at all, so if the radeon driver is loaded then > the radeon card is useless. The switcheroo interface only exists when > radeon is loaded, so unconditionally writing "OFF" to it *on this > system* is the right thing to do.
Would it make sense to make that into a udev rule? Bryce -- Ubuntu-x mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-x
