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    SubjectRe: Intel graphics CPU usage - SDVO detect bogosity?
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    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.




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