Arch Linux

toomanymirrors

Member

Registered: 2007-11-06

Posts: 15

Dual screen with radeon driver stopped working

I've been using the xf86-video-ati or xf86-video-radeonhd drivers on my ATI 1950Pro card with a dual screen setup on two 22" widescreen Acer monitors for the last year and all of a sudden the dual display is not working anymore. I had not changed my xorg.conf http://pastebin.ca/1409905 but here is my current Xorg log http://pastebin.ca/1409904
Right now I'm seeing "cloned" desktops on the two screens but ARandR only sees one monitor http://s288.photobucket.com/albums/ll17 … ot-1-1.png. There was an update to xf86-video-ati yesterday, but no change in my situation unfortunately. Any suggestions or solutions would be awesome. Thanks.

darthaxul

Member

Registered: 2008-09-24

Posts: 156

Re: Dual screen with radeon driver stopped working

It might be an issue with the ati driver.
As I was reading on the wiki if u have a relatively new ati card u should use radeonhd driver, not the ati which is for older cards.

toomanymirrors

Member

Registered: 2007-11-06

Posts: 15

Re: Dual screen with radeon driver stopped working

Using radeonhd driver, it won't let the first monitor have any resolution higher than 1024x768, but the other monitor works fine even though they are identical monitors and my xorg.conf file has full Modeline entries for both and both screen sections have the resolution set to 1680x1050.
Here is what ARandR is showing:

toomanymirrors

Member

Registered: 2007-11-06

Posts: 15

Re: Dual screen with radeon driver stopped working

I've resolved the issue. It turns out that the latest version of xorg-server is finally obeying their documentation on the xorg.conf file. In the Device section I had to change
Option "DVI-I_1/digital" "One"
to:
Option "monitor-DVI-I_1/digital" "One"