Display issue depending on how external monitors are set.

Quardah · 2023-04-17 20:48:10

Hi all.

I am having display issues again using my AMD Laptop. It's a P16s with Ryzen 7 6850U Pro.

For some reason this was my setup for some days and everything was working perfect :

My bro broke his monitor so i lend him my 1920x1080 monitor (the one on the right). This is the new setup with the issue (it has LESS display)

Since then, whenever the 1920x1200 monitor is plugged in, display on the laptop screen 2560x1600 starts to stutter and eventually stops refreshing altogether. I can still move the mouse on the top display 1920x1200 but the laptop screen just freezes completely. If i unplug the HDMI while the issue is happening, all windows are thrown onto the laptop screen for one last time until the entire display just freezes until i forcefully shutdown the laptop.

I have no experienced anything like this when using two monitors. Only since i removed the right one.

I had a similar freeze issue with firefox earlier one and simply turned off hardware accel and it has been working, so i do not think it's related to firefox. this issue happens maybe after 3 or 4 minutes of use while having the top monitor plugged in.

I have no idea how to start debugging this.

Thank you for your time.

Quardah · 2023-04-18 03:20:48

Hi me again. There is no issue if i use the monitors side by side (the 1920x1200 to the right of the display in KDE settings).

It seems like if the total height is longer than the total width (with 1920x1200 on top of 2560x1600 it becomes 2560x2800) the AMDGPU driver does not like that. Simply an hypothesis. Because in the case of having the third monitor (add 1080 to length) i get 3640x2800 which runs silk smooth.

Side note, i made the move buying this laptop because i kept hearing that AMD integrated on Linux were working much better than Intel Integrated + Nvidia Dedicated but it's been a bumpy road, i wouldn't recommend it as of today. Too many issues with externals, firefox and refresh rates in general.

seth · 2023-04-18 07:19:17

Is this an X11 or a wayland session?
Can you re-cause the problem by restoring the "bad" setup?

X11 only:
If so, what happens if you suspend the compositor (SHIFT+Alt+F12)?
Do you use xf86-video-amdgpu?

Quardah · 2023-04-18 20:21:43

seth wrote:

Is this an X11 or a wayland session?
Can you re-cause the problem by restoring the "bad" setup?
X11 only:
If so, what happens if you suspend the compositor (SHIFT+Alt+F12)?
Do you use xf86-video-amdgpu?

Hi Seth. Nice to see you again.

It's an X11 session.

~]$ echo $XDG_SESSION_TYPE
x11
~]$

I can recreate the problem at any time simply by changing the display configuration in KDE display settings.

I just checked i am running amdgpu.

~]$ lshw -c video
  *-display                 
       description: VGA compatible controller
       product: Rembrandt [Radeon 680M]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       configuration: driver=amdgpu

But xf86-video-amdgpu is not installed. Should i install it?

I recall trying the SHIFT+Alt+F12 and it wouldn't make a difference. I recall you already mentioned that to me in other threads, but just to let you know even right now with a working setup i am not seeing any effects of doing so. I double checked and the default shortcut for suspending compositing is there in the settings.

I could however go into console mode with CTRL+ALT+F2 (the session is on F1). So the computer is not completely frozen, just the session on F1.

seth · 2023-04-18 21:03:50

Should i install it?

Typically not, but you may still try.

I could however go into console mode with CTRL+ALT+F2

Is the frozen output reflected at the tail of dmesg?

just to let you know even right now with a working setup i am not seeing any effects of doing so

Shadows? Transparency?

qdbus org.kde.KWin /KWin supportInformation

Arch Linux

#1 2023-04-17 20:48:10

Display issue depending on how external monitors are set.

#2 2023-04-18 03:20:48

Re: Display issue depending on how external monitors are set.

#3 2023-04-18 07:19:17

Re: Display issue depending on how external monitors are set.

#4 2023-04-18 20:21:43

Re: Display issue depending on how external monitors are set.

#5 2023-04-18 21:03:50

Re: Display issue depending on how external monitors are set.

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