[kde] [Bug 468744] New: Monitor show "No signal" in SDDM and KDE

[Alexander Dyadyun]

https://bugs.kde.org/show_bug.cgi?id=468744

            Bug ID: 468744
           Summary: Monitor show "No signal" in SDDM and KDE
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: zlobniyshurik at gmail.com
  Target Milestone: ---

Description of problem:
I have system with two monitors:
Main monitor - AOC275QXL (HDMI 2560x1440 FreeSync)
Auxiliary monitor - Nec2090 (DVI-D 1600x1200)
Video HD4550 (HDMI+DVI-D)
Just before start SDDM my AOC275QXL show "No signal".

How reproducible:
always

Steps to Reproduce:
1. Power on system - picture on both monitors
2. Select fedora in grub - picture on both monitors
3. View boot logs (rhgb disabled) - picture on both monitors
4. Start SDDM - picture only on auxiliary monitor

Actual results:
"No signal" on main monitor after SDDM start. In KDE for X11 and Wayland modes
main monitor show "No signal".

Expected results:
Both monitors can show picture in SDDM & KDE

Additional info:
In "KDE monitor settings" I can see both monitors. I can change resolution for
main monitor, turn on/off "Main monitor switch", enable/disable monitor - no
visual changes on main monitor (still "No signal").

Start system only on main monitor got same effect - "No signal" after SDDM
start

This configuration normally worked before on F37. During F38 install (from
scratch) installer worked on main monitor without problems.

With x11 enabled in SDDM I have both monitors working.
Than, if I load KDE in x11 mode, both monitors working too!

But if I load KDE in wayland mode, my main monitor show "No signal". 
Re-enter in KDE after that in x11 mode did not help. Only system reboot enable
main monitor again.

Initial bug report was in https://bugzilla.redhat.com/show_bug.cgi?id=2187036

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