[Bug 29787] random XRandR failures (i2c related?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29787

--- Comment #15 from Alex Deucher <agd5f at yahoo.com> 2010-11-20 09:10:56 PST ---
(In reply to comment #14)
> Grumble. So, how will this be fixed? Sprinkle the code with
> preempt_disable()/enable() pairs? Advise all users (well, me) to disable
> preemption? Change the code so it no longer acts on intermittent EDID failures?
> Ask your colleagues to design sane hardware that doesn't rely on software
> interaction for timing-critical operations ;) ?
> 
> FWIW, I'm perfectly happy to disable preemption in my kernel, haven't run a
> distro-provided kernel since 2.6.27. But your explanation sounds like this
> could bite a lot more users than just me.

It has nothing to do with the hw, it's the nature of i2c.  All drivers that use
bit banging i2c (hwmon, v4l, lots of embedded stuff) would potentially be
affected.

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