Arch Linux

mbahamonde

Member

From: Germantown, MD

Registered: 2005-02-11

Posts: 15

Dual-Head Disconnected DVI-0

Hi,
I am trying to get dual head working with no luck. The two monitors work fine when linux is booting (cloned view) but under Xorg I can't get the second one working.

I am using Xorg 1.6 X.Org X Server 1.6.1 and [testing]
My card is a 01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]

I am using a DVI-to-VGA extension cable for the DVI output and a regular vga cable on the vga one.

xrandr shows:

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1280
VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 380mm x 300mm
   1280x1024      60.0*+   75.0     60.0*
   1152x864       75.0
   1024x768       75.0     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3
   640x480        75.0     72.8     59.9
   720x400        70.1
DVI-0 disconnected (normal left inverted right x axis y axis)
S-video disconnected (normal left inverted right x axis y axis)

So it sees the DVI-0 one disconnected.

I tried it with extra/xf86-video-ati and also with aur/xf86-video-ati-git.
Same results with both.
Like I said, both monitors work fine when Arch is booting up.

Any ideas?

Thanks in advance!

mbahamonde

Member

From: Germantown, MD

Registered: 2005-02-11

Posts: 15

Re: Dual-Head Disconnected DVI-0

Update: I got both monitors working now, I am now using native VGA and a native DVI cable and it works under clone mode. But I can't get dual-head to work.

 xrandr --output DVI-0 --left-of VGA-0
xrandr: screen cannot be larger than 1280x1280 (desired size 2560x1024)

Both screens are exactly the same monitor so I'm not sure why I'm getting that. Any ideas?

signor_rossi

Member

Registered: 2007-08-24

Posts: 257

Re: Dual-Head Disconnected DVI-0

Update: I got both monitors working now, I am now using native VGA and a native DVI cable and it works under clone mode. But I can't get dual-head to work.

 xrandr --output DVI-0 --left-of VGA-0
xrandr: screen cannot be larger than 1280x1280 (desired size 2560x1024)

Both screens are exactly the same monitor so I'm not sure why I'm getting that. Any ideas?

You miss the 'Virtual' line in xorg.conf! Like this:

SubSection "Display"
                Viewport   0 0
                Depth     24
                Virtual 2560 1024   <----
EndSubSection

Add it for for every bit depth you use.

Last edited by signor_rossi (2009-04-22 17:29:25)

mbahamonde

Member

From: Germantown, MD

Registered: 2005-02-11

Posts: 15

Re: Dual-Head Disconnected DVI-0

What if I use hotplugging?
Is there any way to copy over the current running xorg.conf somewhere so that I don't have to start over from scratch configuring X? Also, will I have to disable hotplugging ?

Thanks a lot in advance for your help!

Last edited by mbahamonde (2009-04-22 17:36:05)

Roberth

Member

From: The Pale Blue Dot

Registered: 2007-01-12

Posts: 894

Re: Dual-Head Disconnected DVI-0

This is a bug that exists in 6.12.2 and but doesnt exist in 6.12.1, so I downgraded for now.

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Use the Source, Luke!