[Bug 108684] New: One monitor sometimes does not turn back on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108684

            Bug ID: 108684
           Summary: One monitor sometimes does not turn back on
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: timokau at zoho.com
        QA Contact: xorg-team at lists.x.org

Created attachment 142391
  --> https://bugs.freedesktop.org/attachment.cgi?id=142391&action=edit
Xorg logfile (through journald)

I have Radeon HD 7870 with two monitors connected. One Acer G276HL over HDMI
and one Dell U2415b over DP.

The Acer sometimes does not turn back on when I wake the computer up from
suspend. That always affects only the Acer. I can also reproduce this by
executing `xset dpms force off && xset dpms force on` enough times. Forcing it
off and on also works to "fix" the issue when it occurs. Switching ttys also
helps.

The kernel version is 4.14.79, the XOrg version 1.19.6, the distro NixOS. Xorg
log is attached.

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