On Tue, 2012-07-31 at 08:31 +0100, James Bottomley wrote: > On Mon, 2012-07-30 at 11:23 -0700, Keith Packard wrote: > > James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> writes: > > > > > On Mon, 2012-07-30 at 09:33 -0700, Keith Packard wrote: > > >> James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> writes: > > >> > > >> > OK, I've run the bisect as far as I can. It looks to be in the drm > > >> > tree. Unfortunately, this tree has several merge points, some of which > > >> > go further back than v3.4. Unfortunately, once the bisect steps back > > >> > before 3.4, we lose the changes that gave us the power savings, making > > >> > further debugging impossible > > >> > > >> What machine is this on? There are a few 'disable some power savings' > > >> patches in that list to work around issues on various machines; knowing > > >> what machine you're using can isolate which ones might have had some > > >> effect on power usage... > > > > > > Lenovo X220i > > > > I don't see a whole lot of context from the elided email bits you'd sent > > previously; can you summarize the issue in terms of how much power > > savings you're losing, how you're measuring it and what's going on in > > the system when the power savings is different? > > Sure. Going from 3.3->3.4 we saw massive increase in power savings due > to various autosuspend updates. The idle power consumption of the X220i > went from about 13W to 6.5W. In 3.5 this seems to be reversed, with the > idle power consumption back up to around 14W. I can't quite believe the > graphics chip is responsible for around 7W, so it looks like it's some > interaction between graphics and other subsystems. > > > Have you tried measuring power with X not running? How about with > > compositing and other desktop effects disabled? > > Sure, I can try doing that ... but remember this is a system where the > drm is used for the console as well. Actually, bad news: it looks like the problem is drm: on 3.5 killing X causes idle power to go 14W -> 5.9W on 3.4.6 killing X causes idle power to go 6.8W -> 5.7W James _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
