Arch Linux

cyberpsych0sis

Member

Registered: 2014-11-02

Posts: 47

Swapped Monitors now I have no display

Today I was trying to configure my system to display on 3 monitors all using differing outputs: DVI, VGA, HDMI which were on my video card. It seems that the card can only render two monitors at a time. But the bigger problem now is that something went wrong... (No i don't know what happened) it will only render on one of those three monitors (DVI) after starting X and I have no idea why or how to make it load on the other two (even when only connected to one of them). When I try starting x on either just the HDMI monitor or the VGA monitor I simply get a blanks screen. I don't even know where to start. Any hints?

Also, this computer has loaded onto all of these monitors in the past, so it must be some configuration issue.

EDIT: This actually only seems to affect using the HDMI in conjunction with the DVI or VGA. I can run VGA and DVI together but cannot run either of them with HDMI or even HDMI by itself at this point...

Last edited by cyberpsych0sis (2014-12-12 03:45:12)

th3voic3

Member

Registered: 2012-03-20

Posts: 92

Re: Swapped Monitors now I have no display

What graphics card and driver are you using?

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cyberpsych0sis

Member

Registered: 2014-11-02

Posts: 47

Re: Swapped Monitors now I have no display

What graphics card and driver are you using?

Card: Radeon HD5450
Drivers: xf86-video-ati 1:7.5.0-1 and the Vesa Drivers

After doing some research this:
https://wiki.archlinux.org/index.php/AT … _X_screens
might have something to do with it...

bleach

Member

Registered: 2013-07-26

Posts: 264

Re: Swapped Monitors now I have no display

if or when you have the right driver;
you have a monitor to look at it seems depending on your wm/de there should be a tool to turn them on maybe there just off and its after x so its a x config i would think.

try xrandr

xrandr --output VGA-1 --mode 1920x1080 --pos 0x0 --rotate normal --output HDMI-1 --mode 1920x1080 --pos 1920x0 --rotate normal --output DVI-1 --mode 1920x1080 --pos 3840x0 --rotate normal

thats from left to right. your output's may differ as well as resolutions and position depending on your setup. arandr is a good front end to xrandr its in gtk though so it will pull gtk and dependencies if you do not have it.

Last edited by bleach (2014-12-13 07:50:25)

cyberpsych0sis

Member

Registered: 2014-11-02

Posts: 47

Re: Swapped Monitors now I have no display

if or when you have the right driver;
you have a monitor to look at it seems depending on your wm/de there should be a tool to turn them on maybe there just off and its after x so its a x config i would think.

try xrandr

xrandr --output VGA-1 --mode 1920x1080 --pos 0x0 --rotate normal --output HDMI-1 --mode 1920x1080 --pos 1920x0 --rotate normal --output DVI-1 --mode 1920x1080 --pos 3840x0 --rotate normal

thats from left to right. your output's may differ as well as resolutions and position depending on your setup. arandr is a good front end to xrandr its in gtk though so it will pull gtk and dependencies if you do not have it.

That would certainly make sense, the monitor only goes blank after the x has started... I'm using Awesome as my WM... Thanks for the tip!