[Bug 86436] New: Second GPU second monitor invalid initialization / behavior

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86436

            Bug ID: 86436
           Summary: Second GPU second monitor invalid initialization /
                    behavior
           Product: xorg
           Version: 7.5 (2009.10)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: naquad at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 109672
  --> https://bugs.freedesktop.org/attachment.cgi?id=109672&action=edit
Xorg log

I have 2 video cards: Radeon HD 4870 and Radeon HD 6750. Each of them has 2
monitors connected. Setup works fine in Windows and under Xinerama.

I've been trying to make it work with XRandR. Theese are my settings:

xrandr --setprovideroutputsource 1 0

xrandr --output DVI-0 --auto --right-of DVI-1
xrandr --output DVI-1-2 --auto --left-of DVI-1
xrandr --output DVI-1-3 --auto --left-of DVI-1-2

But only one of the monitors work on the second video card. It can be either
DVI-1-3 or DVI-1-2, but not both of them.
When I try to enable second monitor I see the following in Xorg.0.log:

[  1487.331] (II) RADEON(0): Allocate new frame buffer 7680x1216 stride 7680
[  1487.353] (II) RADEON(0): VRAM usage limit set to 190789K
[  1487.358] Cannot do multiple crtcs without X server dirty tracking 2
interface
[  1487.358] failed to set shadow slave pixmap
[  1487.358] need to create shared pixmap 0

DVI-1-3 is turning on, but it clones DVI-1-2 while X thinks it is extra space
(because I can drag windows there and see it as empty space in workspace
indicator). Trying to do xrandr --output DVI-1-3 --off makes xrandr nuts:

X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Value in failed request:  0x0
  Serial number of failed request:  62
  Current serial number in output stream:  63

After this to get back into normal state I have to restart Xorg.

Complete Xorg.0.log attached.

Any chances this can be fixed?

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