Bug#451972: no longer supports xinerama across multiple graphics cards
martin f krafft wrote:
> I know we're in the middle of a transition from legacy xinerama to
> XRandR, but I still think it's a bug if a new version of X breaks
> the triple-head setup I have. It may seem that triple-head is mere
> geeky joy, but to me it's actually a requirement to get my work
> done.
Sure, my mail wasn't meant to tell you to go to hell with your useless
triple head :) Given some discussion with upstream, I was just checking
whether your problem changed a bit recently.
> Given that I don't really like my xorg.conf anyway (it's old) and
> really want to move towards XRandR, I then simply removed xorg.conf
> and would like to go from here. X comes up, but it only speaks to
> one of the two ATI boards, and the screen is mirrored on the two
> attached displays.
Mirror is the default behavior, it is meant to give you the login window
on all monitors so that you can always login with a default config even
if some monitors do not work correctly. See III.2 of
http://wiki.debian.org/XStrikeForce/HowToRandR12 for xorg.conf based
configuration.
Having only one board work is what we need to get fixed...
> 1. use xrandr to create screen 2 on the second VGA port of the
> PCI:1:0:0 card and to put it right-of screen 1 attached to the
> first port. I don't know what output name to use for that.
>
See above.
> 2. somehow teach X about the PCI:0:12:0 card and use xrandr to put
> the one display attached to its primary card left-of screen 1.
>
> Is this possible?
>
Not sure about that unfortunately. If the driver doesn't even look at
board 0:12:0, it doesn't look good. Maybe you need to restore 2 devices
sections with the appropriate BusID lines? Not sure whether you need to
restore some corresponding Screen and ServerLayout sections...
Brice
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