On Sun, Aug 15, 2010 at 07:32:15PM -0700, Linus Torvalds wrote: > I started wondering why 'top' was showing an otherwise idle system as > having a load average of 0.5+, and worker threads constantly using the > CPU. > > So I did a system-wide profile, and got the attached output (look at > it in a really wide terminal). > > There seems to be something _seriously_ wrong with i915 SDVO detect. > This is on an Apple Mac Mini (hey, your favorite problem child!), and > apparently it spends 20% of its non-idle CPU time just doing udelay's > for the i2c SDVO connection detection. > > That sounds a bit wrong, doesn't it? > > I don't know how recent this is - it might have been going on for some > time without me noticing. It's the wife's computer, and the same thing > doesn't seem to happen on my Core i5 desktop > > Any ideas? Any information I can give about the machine? You're not alone. I'm seeing similar things on my machine (AMD,Radeon). The monitor outputs are polled every 10 sec in drivers/gpu/drm/drm_crtc_helper.c. There is a patch attached to the following bug report that disables polling and solves the problem for me: http://bugs.freedesktop.org/show_bug.cgi?id=29536 -- »A man who doesn't know he is in prison can never escape.« William S. Burroughs _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
