[Bug 93512] [i915] Display loses signal, intermittently, only when several programs are running

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93512

--- Comment #5 from Irene <ireneista at gmail.com> ---
Jari,

That's okay!

It does still happen, and I even still have the affected machine. Through
further experimentation, I found that what was happening was that the actual
fastest pixel clock which the integrated GPU could output was slower than what
X was trying to use. So to work around it, I either reduce the total
resolution, or reduce the framerate.

It is possible that this is actually the monitor's fault; the modeline that it
was using came from the monitor's EDID, and I have reproduced a similar issue
on a different machine with the same monitor.

If it's the monitor to blame, I don't know that it's really a problem for
freedesktop to fix... It would be handy at the very least to be able to
configure X not to drop back into the default highest mode the monitor
suggests, if it's ever hot-swapped, but I don't see anywhere in the X
configuration that that sort of setting could be hooked onto.

I also theorized that the intermittent behavior was the result of allocating
more video memory, but from cursory use of Intel's GPU tools, I was unable to
find support for this. I stopped looking into it at that point, because I had a
workaround already.

I'll plug the original machine that the report came from back in at some point
in the next couple weeks, and get you logs from it; I'll also try to get logs
from the other affected machine, for comparison.

Irene

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