Problems with multiple monitors in Ubuntu 13.04

[Carl Perry]

On 05/10/2013 06:13 AM, Alex Deucher wrote:
> On Thu, May 9, 2013 at 3:58 AM,  <caperry at edolnx.net> wrote:
>> On Thu, 9 May 2013 10:21:03 +1000, Dave Airlie <airlied at gmail.com> wrote:
>>>> I have two 6450 cards in my Ubuntu 13.04 system with three monitors.
>> This
>>>> is
>>>> a recent install with no binary drivers installed and no additional X
>>>> ppa's
>>>> installed. I can get X to display output on the primary monitor, and I
>>>> can
>>>> see all three in xrandr:
>>>>
>>>> Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
>>>> HDMI-0 disconnected (normal left inverted right x axis y axis)
>>>> DVI-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis)
>>>> 597mm x 336mm
>>>>    2560x1440      60.0*+
>>>> VGA-0 disconnected (normal left inverted right x axis y axis)
>>>> HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y
>> axis)
>>>> 475mm x 267mm
>>>>    1920x1080      60.0*+
>>>>    1280x1024      75.0     60.0
>>>>    1152x864       75.0
>>>>    1024x768       75.1     60.0
>>>>    800x600        75.0     60.3
>>>>    640x480        75.0     60.0
>>>>    720x400        70.1
>>>> DVI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis)
>>>> 475mm x 267mm
>>>>    1920x1080      60.0*+
>>>>    1280x1024      75.0     60.0
>>>>    1152x864       75.0
>>>>    1024x768       75.1     60.0
>>>>    800x600        75.0     60.3
>>>>    640x480        75.0     60.0
>>>>    720x400        70.1
>>>> VGA-1 disconnected (normal left inverted right x axis y axis)
>>>>
>>>>
>>>> The second and third monitor are on (out of power save mode) but show no
>>>> input. However, XFCE seems to detect them as I have two wallpapers
>>>> stacked
>>>> on top of each other, one at the main monitor's 2560x1440 resolution and
>>>> one
>>>> at a 1920x1080 resolution (see
>>>>
>> http://edolnx-public.objects.dreamhost.com/Screenshot%20-%2005072013%20-%2009_10_02%20AM.png
>>>> ). Attempting to make any changes with xrandr causes X to crash with a
>>>> SIGSEGV. Here's a log: http://paste.ubuntu.com/5640585/ Any ideas?
>>> You probably need to setup an xorg.conf like you always have before
>>> for dual-card setups like that.
>>>
>>> It might be possible to make it work better if you plug two monitors
>>> into the first card and one into second,
>>> you'll be using GPU offload, so the second GPU won't be doing anything
>>> more than displaying what the first
>>> is showing.
>>>
>>> Dave.
>> I've tried creating a basic config for multiple monitors, and now X crashes
>> on startup.
>> The config: http://paste.ubuntu.com/5646972/
>> The log: http://paste.ubuntu.com/5646975/
>>
>> I thought it may be GLX, so I tried disabling that but got the same error.
>> I also tried two displays
>> on the primary card. That created output on two displays, but using xrandr
>> still caused a crash of X.
>> The monitor on the second card still had no output.
>>
>> Any other thoughts?  I've tried ATI and nVidia cards, and both yield
>> similar results. I realize this is
>> the ati driver list, but it may be an interesting data point.
> You need to use the ZaphodHeads option in each device section to
> assign which connector(s) you want to use with each instance of the
> driver.
>
> Alex
I've tried with the ZaphodHeads option, same result: X crashes on startup.
Logs: http://paste.ubuntu.com/5655332/
Config: http://paste.ubuntu.com/5655333/

If I put in the wrong information in the ZaphodHeads option, then only
the primary display works. The other two say in powersave mode. Any
other ideas?

  -Carl