On Sun, 2010-08-15 at 19:32 -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?
At least we should replace mdelay with msleep in those functions.
Can you get a boot with drm.debug=4?
I wonder are we picking up a bad SDVO, the insane code retries 50 times with a hard loop delay.
Dave.