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#1 2019-02-13 13:56:12

spirit369
Member
Registered: 2019-02-13
Posts: 10

[SOLVED] Fullscreen games cause screen to turn off

Hi,

I am using Archlinux with Cinnamon desktop, with AMD Radeon GPU.

The problem:
When I run apps/games that use fullscreen (e.g. DOSBox, Nexuiz, assaultcube) - my screen turns off (LED starts blinking). I then have to press CTRL+F1/F2 to switch to console and then reboot my computer.

Workaround:
On some games I was able to use command line switches or modify the configuration files so the fullscreen resolution is set to 1920x1080, and then everything works fine, but on some of them it is not possible. I think that the screen turns off when the games try to switch the resolution to 1024x768, for some reason.

Any ideas what can cause this?

Many thanks!

Last edited by spirit369 (2019-03-01 17:23:15)

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#2 2019-02-13 14:45:39

Ropid
Member
Registered: 2015-03-09
Posts: 1,069

Re: [SOLVED] Fullscreen games cause screen to turn off

I would think that's a bug in the firmware of the monitor (the different resolutions run fine here for me with an AMD card).

I have two ideas about how to avoid the problem:

There is a property named "scaling mode" in the output of "xrandr --verbose". For me here its value is set to "None" by default. If you change it to one of the other possible values, then the graphics card will do the job of scaling the different resolutions. Your monitor will then see a 1920x1080 picture, not 1024x768.

The problem I just now found out here for me is, I see corruption when using "Full aspect" or "Full". Only "Center" looks good, but that might be too small to play 1024x768 games.

You change that property like this:

xrandr --output DisplayPort-0 --set 'scaling mode' 'Full aspect'

You can find the name for "--output" by looking at what's "connected" when you run "xrandr -q".

The other idea have is, you could remove some of the resolutions you see in the "xrandr" output through "xrandr --delmode <output> <mode>". Maybe try that and see how the game reacts.

Last edited by Ropid (2019-02-13 14:50:49)

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#3 2019-02-13 18:02:05

spirit369
Member
Registered: 2019-02-13
Posts: 10

Re: [SOLVED] Fullscreen games cause screen to turn off

Ropid, your advice to change the scaling mode value solved the problem. I changed it from "None" to "Full".

I appreciate your help very much! THANKS!


*** Later update***
I switched from radeon driver to amdgpu (due to another problem) - and it looks like it solves the problem without changing the scaling mode smile

Last edited by spirit369 (2019-03-01 17:24:27)

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