[Bug 71701] Regression, Dual-Head, i915 mode-setting driver, "pipe B stuck"

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71701

--- Comment #11 from Kris Karas <bugs-a13 at moonlit-rail.com> ---
OK, fair enough, patchlet from comment #8 applied.
Failure rate dropped from 86% down to 55%.

Note that the "51 loops" I measured in comment #7 was just one sample point. 
The value seems to vary from boot to boot, albeit not by much.

If the 25ms time required is an average, then the code should accommodate
values at least a couple standard deviations out from the curve of required
time.  Perhaps adjust the code to continue to use usleep((retry + 1) * 500) but
up the for() to be for(retry=0; retry < 13; +retry) {...}

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