[Xorg] Dual-head setup with multiple devices
To make this short...
I have a box with 2 VGA Adaptors, both are AMD and both can run the open-source Radeon Driver. Each have a monitor connected to there DVI-I-0 port(dvi port 0). devices are as follows: 1. R9 280x(Tahiti) PCI:1.x 2. HD5xxx(Evergreen) PCI;6.x I havent done a dual-head setup in a very long time and the conf.d makes things a little more confusing while helping making things more modular. i cant figure out how to configure these, i can get X to detect the devices but it doesnt say anything about there screens or independence at all. just keeps plowing through to defaults on 1. Please help me, LQ, your my only hope! |
The 'prefered' way to do this now is to use xrandr, for instance on my system
Code:
keithhedger@LFSHal:~-> xrandr Code:
xrandr --output VGA-0 --below DVI-0 --mode 1920x1080 |
this doesnt work with multiple devices. as it only detects one device.
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MAybe a problem with one of your cards then as, as you can see I have two different devices, both of which are detected properly.
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Normally i would agree, but ive managed a independant dual-head through some wierd configuration once... and only once. cant get xinerama or the like to work
ill give more info. lspci | grep VGA Code:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] Code:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384 xorg.0.log on Gist < with serverlayout disabled, so monitor layout is not set... screen #2(Acer) is powered(active light is on, and backlight is lit). but there is no activity and nothing in xrandr. screen #1(AOC) is fine though. i cant make heads or tails of it. |
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