Multi-monitor system / 2nd graphics card not working

[Member gg753]

Hello,

I’m currently running antiX 19.1 in a test configuration (from USB stick). I have a multi-monitor system with four similar monitors (1280 x 1024 pxl) arranged in a 2×2 pattern. There a two identical graphics cards in my PC. Three monitors are connected to graphics card no. 1, the fourth monitor is connected to graphics card no. 2. (This monitor isn’t displayed in the following inxi output.)

$ inxi -G
Graphics:
  Device-1: AMD Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] 
  driver: radeon v: kernel 
  Device-2: AMD Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] 
  driver: radeon v: kernel 
  Display: x11 server: X.Org 1.20.4 driver: ati,radeon 
  unloaded: fbdev,modesetting,vesa 
  resolution: 1280x1024~60Hz, 1280x1024~60Hz, 1280x1024~60Hz 
  OpenGL: 
  renderer: AMD CAICOS (DRM 2.49.0 / 4.9.200-antix.1-amd64-smp LLVM 7.0.1) 
  v: 3.3 Mesa 18.3.6 

My problem is that antiX seems to support one graphics card only. During the boot process there is the following output:

live-vcard: Video card selection
Removing file /var/lib/live-mstate/vcard-mode
Found 2 Video devices
Found 0 Intel Video devices
-----
Please select a video card to use:
1) AMD Caicos [Radeon HD 6450/7450/8450/ R5 230 OEM]
2) AMD Caicos [Radeon HD 6450/7450/8450/ R5 230 OEM]
0) Quit/disable
-----
> 1
Newly selected video card
AMD Caicos [Radeon HD 6450/7450/8450/ R5 230 OEM]
Setting Xorg bus-id to 0000:01:00.0
Did not find any other video drivers to disable
-----

Only three monitors (which are connected to card no. 1) are active, the fourth monitor remains dark.

Does antiX support one graphics card only?

Thanks.

• This topic was modified 3 years, 3 months ago by gg753.

[Moderator caprea]

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Looks like the second card needs to get activated
xrandr --setprovideroutputsource 1 0

https://unix.stackexchange.com/questions/408114/configure-2-video-cards-on-debian-9-stretch/408198#408198

[Member gg753]

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Thank you very much – this solved the problem.

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