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#26 2022-10-24 19:54:26

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 69,138

Re: Nvidia + Plasma + 3 monitor multihead isn't functioning as intended.

The outputs are all there, juggle the order and then escalate the situation

xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
# xrandr --output DP-3 --off
# xrandr --output DP-1 --off
xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
# xrandr --output DP-1 --off
xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
xrandr --output DP-1 --off

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#27 2022-10-25 02:34:11

allevil669
Member
Registered: 2013-05-23
Posts: 30

Re: Nvidia + Plasma + 3 monitor multihead isn't functioning as intended.

seth wrote:

The outputs are all there, juggle the order and then escalate the situation

xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
# xrandr --output DP-3 --off
# xrandr --output DP-1 --off
xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
# xrandr --output DP-1 --off
xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
xrandr --output DP-1 --off

Ok... Testing complete.

xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
# xrandr --output DP-3 --off
# xrandr --output DP-1 --off

SDDM comes up, as expected. Login works as expected.

xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
# xrandr --output DP-1 --off

Here's the breakage. In SDDM, DP-5 comes up as defined in the xrandr command, and DP-3 dutifully turns itself off. DP-1 remains on, and available. When I log in, however, DP-1 does not turn back on, and for whatever reason, kscree2 decided to put DP-1's desktop on DP-3, which does come on and adjust accordingly, DP-1 stays off.

xrandr --output DP-5 --mode 2560x1440 --rate 75.0 --rotate normal --primary
xrandr --output DP-3 --off
xrandr --output DP-1 --off

This one breaks even worse, with neither DP-1 nor DP-3 turning back on when I log in, and DP-5 having issues with rendering any windows on top of it all.

I even tried using xrandr to configure DP-1 and DP-3 as they would be configured in kscreen2, but that causes the same issues as option 2.

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#28 2022-10-25 06:22:00

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 69,138

Re: Nvidia + Plasma + 3 monitor multihead isn't functioning as intended.

DP-1 remains on, and available. When I log in, however, DP-1 does not turn back on

Why/when does it turn off?? Or did you expect but not see DP-3 to turn off?
Move the files in ~/.local/share/kscreen/ away.

DP-5 having issues with rendering any windows

What kind of "issues" specifically?

I even tried using xrandr to configure DP-1 and DP-3 as they would be configured in kscreen2

Please post the actual xrandr commands, the output and the resulting "xrandr -q"

Can you mitigate any of the in-session problems by restarting the compositor (turning it off and on again…)

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