On Wed 2009-08-12 01:55:32, Matthew Garrett wrote: > On Tue, Aug 11, 2009 at 08:51:49PM -0400, Tippett, Matthew wrote: > > > From a graphics perspective (your area of expertise), this will allow KMS > > drivers to do some more intelligent actions based on the ac/dc state. > > Some examples of this could be improving the power consumption of the > > graphics hardware through adapting clock memory/engine settings for > > reduced power consumption, reducing refresh rate of the display to reduce > > scanout memory access, adjusting backlight brightness, etc. > > Right. As you say, my concern is that most of this should belong in > userspace. Where we risk hardware damage there's an obvious argument for > doing this in kernel, but we should ensure that that's limited to > whatever coarse-grain handling is absolutely required rather than doing > things like touching display brightness. Yep... Some may want to save power even when AC is online -- like when running on UPS. Some may want max performmance even on battery. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
