I have a pretty old machine with ATI R4850 in it using open source drivers. It
runs F25, and until recently was booting fine.
I have changed my old monitor to an UHD monitor, and that's where the problems
started. I simply can't get screen to display anything, it seems, unless :
1. I connect old monitor. It shows Plymouth, then it is only active screen in
SDDM, and then it turns off, leaving UHD display working. That last feature is
I think thanks to fact that I've disabled it in System Settings -> Display and
Monitor -> Display Configuration, as before it stayed on.
2. I set grub to use a theme. UHD screen is flashing through Plymouth run
(trying to find correct resolution ?), then SDDM is shown, fully working. Upon
login I can see KDE loading screen, and I'm back to blank screen presumably
cycling through resolutions, as screen goes off, then on, then off and displays
My assumption is that the monitor's preferred resolution is way more than my
old machine can display, and it struggles with it. Any ideas on how to set the
correct resolution for it KDE, and maybe for Plymouth ?
I've tried setting modelines and resolution in xorg.conf file
(/etc/X11/xorg.conf.d/00-video.conf to be precise), as well as presumably
disabling EDID. It seems to have no effect.
For Plymouth, I'm not too concern about it, I can live with text boot, but it
was nice thing to have. I would prefer to have text based grub, rather than a
Any ideas I could try ? Any specific settings for this ? As said, tried to set
up modelines and specific resolution, but maybe this was not picked up
Thanks in advance.
Solutions Engineer (LPIC 3, Novell CLA, AWS SAA certified)
Tel: 0845 4210444
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