[SOLVED] KDE no video on boot when dual monitors connected

ThatJuanjo · 2020-12-06 17:31:40

Hi all!

First post here, so please go easy on me ?.

Recently I upgraded my setup by adding two monitors plus a KVM switch (so I can switch from my work computer, non-arch sadly, and my personal desktop with arch!).

I am having problems when booting arch on my personal computer though: if both monitors are connected to the kvm switch the video freezes after the initial loading arch linux screen (the screen right before the login screen of KDE). However booting with one monitor disconnected from the KVM Switch and restarting my machine does the trick and I am able to get arch booted with video, interestingly enough once I am logged in I can re-connect the second monitor and it will work without any issue.

More simply: if both screens are connected during boot, it fails to give video. If only one screen is connected during boot, it succeeds, if then I attach the second screen AFTER it has booted without problems, it works flawlessly.

Here is the output of xrandr -q

DP-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95*+
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     59.90    59.91  
   1920x1200     59.88    59.95  
   2048x1080     60.00    24.00  
   1920x1080     59.96    60.00    50.00    59.94    59.93  
   1600x1200     75.00    70.00    65.00    60.00  
   1680x1050     59.95    59.88  
   1400x1050     74.76    59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     75.02    60.02  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      75.00  
   1280x720      60.00    59.99    59.86    60.00    50.00    59.94    59.74  
   1024x768      75.05    60.04    75.03    70.07    60.00  
   960x720       75.00    60.00  
   928x696       75.00    60.05  
   896x672       75.05    60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   832x624       74.55  
   960x540       59.96    59.99    59.63    59.82  
   800x600       75.00    70.00    65.00    60.00    72.19    75.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   720x576       50.00  
   700x525       74.76    59.98  
   800x450       59.95    59.82  
   720x480       60.00    59.94  
   640x512       75.02    60.02  
   700x450       59.96    59.88  
   640x480       60.00    75.00    72.81    75.00    60.00    59.94  
   720x405       59.51    58.99  
   720x400       70.08  
   684x384       59.88    59.85  
   640x400       59.88    59.98  
   576x432       75.00  
   640x360       59.86    59.83    59.84    59.32  
   512x384       75.03    70.07    60.00  
   512x288       60.00    59.92  
   416x312       74.66  
   480x270       59.63    59.82  
   400x300       72.19    75.12    60.32    56.34  
   432x243       59.92    59.57  
   320x240       72.81    75.00    60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-2 connected primary 1920x1080+2560+0 (normal left inverted right x axis y axis) 597mm x 336mm
   1920x1080     60.00*+  74.98    59.96    50.00    59.94    59.93  
   1920x1200     59.88    59.95  
   1600x1200     75.00    70.00    65.00    60.00  
   1680x1050     59.95    59.88  
   1400x1050     74.76    59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1366x768      59.79  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      75.00  
   1280x720      60.00    59.99    59.86    60.00    50.00    59.94    59.74  
   1024x768      75.05    60.04    75.03    70.07    60.00  
   960x720       75.00    60.00  
   928x696       75.00    60.05  
   896x672       75.05    60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   832x624       74.55  
   960x540       59.96    59.99    59.63    59.82  
   800x600       75.00    70.00    65.00    60.00    72.19    75.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   720x576       50.00  
   700x525       74.76    59.98  
   800x450       59.95    59.82  
   720x480       60.00    59.94  
   640x512       75.02    60.02  
   700x450       59.96    59.88  
   640x480       60.00    75.00    72.81    75.00    66.67    60.00    59.94  
   720x405       59.51    58.99  
   720x400       70.08  
   684x384       59.88    59.85  
   640x400       59.88    59.98  
   576x432       75.00  
   640x360       59.86    59.83    59.84    59.32  
   512x384       75.03    70.07    60.00  
   512x288       60.00    59.92  
   416x312       74.66  
   480x270       59.63    59.82  
   400x300       72.19    75.12    60.32    56.34  
   432x243       59.92    59.57  
   320x240       72.81    75.00    60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

And this is the information on my graphic controller:

05:00.0 VGA compatible controller: NVIDIA Corporation TU102 [GeForce RTX 2080 Ti Rev. A] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 866a
        Physical Slot: 4
        Flags: bus master, fast devsel, latency 0, IRQ 61, NUMA node 0
        Memory at de000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at d000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

As I already said I am using KDE Plasma as graphic environment.

Additional issue: There is no audio... but I'd like to solve the video problem first

Last edited by ThatJuanjo (2020-12-06 22:28:38)

twelveeighty · 2020-12-06 18:08:59

Hi - welcome to Arch. These boards use BBCode, please use [ code ] tags (w/o spaces) for output, not ```. Please edit your original post and put those in, it makes it much easier to read and therefore to help.

As for your specific problem, it sounds like your Display Manager (likely SDDM) is having problems detecting that 2nd monitor. Collect and post the Journal log, dmesg and Xorg logs after you've plugged in two monitors and had a problem.

ThatJuanjo · 2020-12-06 22:30:10

I restarted my machine and noticed that the issue is now fixed... my guess is that when running xrandr some configuration got updated somewhere and that fixed the issue (given that running that command is literally the only thing that I did).

I also figured out on my own how to fix my audio (The wrong device was set as default)

Thanks for your help anyway!

Arch Linux

#1 2020-12-06 17:31:40

[SOLVED] KDE no video on boot when dual monitors connected

#2 2020-12-06 18:08:59

Re: [SOLVED] KDE no video on boot when dual monitors connected

#3 2020-12-06 22:30:10

Re: [SOLVED] KDE no video on boot when dual monitors connected

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