[Bug 94014] New: 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

            Bug ID: 94014
           Summary: Failure to wake monitor after sleep on Haswell
                    graphics driver under 4.4.1
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: da_audiophile at yahoo.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121542
  --> https://bugs.freedesktop.org/attachment.cgi?id=121542&action=edit
Xorg.0.log after the monitor will now wake up

I am running 4.4.1 on Arch x86_64 and have noticed that this update (coming
from 3.4.5) causes the monitor to not wake up from sleep state. I have to
`systemctl restart display-manager` in order to revive the Xorg display.

Exact symptoms:
1) Leave monitor on and wait for power savings to kick it/LED on monitor is
blue.
2) Power savings kick it and LED goes amber and screen goes to sleep.
3) Hit any key to wake up the monitor.  LED goes blue, but "no signal" is
displayed on the screen.
4) LED goes amber again.

This is 100% reproducible (I have confirmed 4 times in a row).

This machine is an Intel i7-4790K (Haswell) using the onboard graphics chip
connected to the monitor via HDMI.  The motherboard is an MSI Z97 Mpower Max AC
using the latest BIOS.  I am using the distro provided drivers
(xf86-video-intel 1:2.99.917+519+g8229390).  I am glad to provide additional
debug info upon request.

The attached dmesg includes the 'log_buf_len=1M' kernel parameter which seems
to have eclipsed the initial lines of my dmesg output.  I attached my full
/var/log/Xorg.log as well.

Note that I have tried letting xscreensaver control the power state of the
monitor or letting xfce4 power manager do it and I am left with the same result
described above.  Downgrading to kernel 4.3.5 with no other changes solves the
problem.

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