Apologies up front if I am missing technicalities or placing this in the wrong forum. I’m pretty new to Linux overall.
Fedora 43, but this was occurring on 42 before upgrading.
Dell Latitude 5511 - i7-10850, Intel HD630 integrated graphics
i915 driver
All applications, kernel, and firmware up-to-date
I run this with three displays - 1080p laptop screen, 3440x1440 Dell USB-C monitor, and a 4K 60Hz TV via HDMI.
If I boot with all three displays connected, I get stuck at the “Dell - Fedora” loading screen. I disconnect one, and the computer boots without issue. If I then re-connect the 3rd monitor, the other two begin to freeze in 5-10 second intervals. If I am able to navigate to display settings in that time, I will see the third display is disabled. When I try to enable it, I get the error “Couldn’t apply display configuration. The driver rejected the output configuration”.
This appears to be tied to Wayland, as I don’t have the same failure running an X11 session. However, I scale these displays differently from each other due to the varying resolutions, and I can’t do that in X11. This issue was not present prior to upgrading to the latest Plasma, and it is not a problem when booting into Windows 11.
Are there any solutions? I appreciate anyone’s help in advance!
There was a fix / workaround for similar situations where you get close to the GPU’s bandwidth limits, it’ll be in Plasma 6.5.2, so there’s a chance that will fix it.
If it doesn’t help, then please open a bug report for kwin about this and we’ll take a closer look at what’s going on.
Similar issue here. Fedora 42 with KDE Plasma 6.4.5 worked fine. After upgrading to Fedora 43, the SDDM login fields no longer appeared upon booting. Plugging in the monitor allowed me to log in, but when I plugged it back in during a session, both the mouse and keyboard froze for 20 seconds, after which they were stuck on the first (then empty) screen.
While able to interact with the second screen for a few seconds, KDE Plasma recognized that there was a third monitor but couldn’t see or select it in the arrangement settings. xrandr found nothing about the screen at that point.
I switched to Gnome 49 on Fedora 43, and everything worked fine then. xrandr showed all three displays.
After installing plasma-wayland-session, I could also start a working KDE Plasma 6.5 session (in X11).
It seems to be a problem with KDE Plasma 6.5 together with Wayland.
My hardware is somewhat older but similar to an XPS 9570, Core™ i7-8750H, Intel UHD 630 + NVIDIA RTX 1050TI. The laptop screen is 3840x2160, and both external displays are FHD. I use a Dell WD22TB4 docking station.