[Bug 94014] Failure to wake monitor after sleep on Haswell graphics driver under 4.4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94014

Luke <luke at diamand.org> changed:

           What    |Removed                     |Added
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                 CC|                            |luke at diamand.org

--- Comment #18 from Luke <luke at diamand.org> ---
I'm getting something very similar.

Older 4.2 kernels are fine, but with 4.3 onwards, once the monitor has been
turned off by the screensaver (under xfce4), it can't ever be woken up again.

Switching to a VT partially fixes it (I can see the VT) but the only way to get
X working again is /etc/init.d/xdm restart.

This is on Gentoo, with:

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)

And an Acer G246HYL 1080p HDMI monitor.

Doing some bisecting, I came up with this change:

   237ed86 drm/i915: Check live status before reading edid

That change modifies the way that intel_hdmi_detect() waits for HDMI hotplug to
complete. Before this change I think it just kind of ignored the HPD but now it
seems to care whether it came up or not.

That change was itself in turn later on fixed up in:

   f8d03ea drm/i915: increase the tries for HDMI hotplug live status checking

But I wonder if perhaps my monitor is just being too slow even for that. I
tried playing around with the timeout and seemed to improve things, but not
actually fixed them (it now works about 50% of the time vs. previously none of
the time).

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