[kde] [Bug 468547] New: Second monitor have no hdmi signal after waking from sleep

[Andrew Shark]

https://bugs.kde.org/show_bug.cgi?id=468547

            Bug ID: 468547
           Summary: Second monitor have no hdmi signal after waking from
                    sleep
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: ashark at linuxcomp.ru
  Target Milestone: ---

I have several monitors. One monitor is connected with displayport, second
monitor is connected with hdmi. The problem appears after sleep. The hdmi
monitor stays in stand by mode (waiting for signal).

STEPS TO REPRODUCE
1. Turn on PC. Both monitors show picture.
2. Turn PC to sleep.
3. Wake up PC.

OBSERVED RESULT
The picture is only shown on displayport monitor. On hdmi monitor there is no
signal.

EXPECTED RESULT
Picture should be shown on both monitors.

This is a regression. It worked normally previously. Unfortunately, I do not
know exactly in which version it was broken. Probably a month ago.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 580 Series

ADDITIONAL INFORMATION
There are workarounds:
1) Turn off, then turn on the monitor by its power button.
2) Disable, then enable the hdmi monitor in system settings.

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