[Bug 81476] New: three monitors on two radeon cards works with some layouts not others

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81476

          Priority: medium
            Bug ID: 81476
          Assignee: xorg-driver-ati at lists.x.org
           Summary: three monitors on two radeon cards works with some
                    layouts not others
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: idallen at idallen.ca
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

Created attachment 103009
  --> https://bugs.freedesktop.org/attachment.cgi?id=103009&action=edit
Xorg.0.log

Summary: Three monitors on two cards work fine in some layouts but not others.

Ubuntu 12.04.4 LTS with updated kernel and Xorg from Ubuntu "Trusty".
Two ATI FireMV 2250 cards with three 1600x1200 Dell LCD monitors.
(More details below.)
No xorg.conf file - using defaults.

Works fine out-of-the-box when configured with two screens adjacent on one card
and the third screen (on the second card) anywhere above or below either of the
two adjacent screens.  All three monitors display their screens nicely and I
can drag windows to all three screens on all three monitors.

Relevant xrandr for the above working configuration:
Screen 0: minimum 320 x 200, current 3200 x 2400, maximum 8192 x 8192
DVI-0 connected primary 1600x1200+0+0 (normal left inverted right x axis y
axis) 367mm x 275mm
DVI-1 connected 1600x1200+1600+0 (normal left inverted right x axis y axis)
367mm x 275mm
DVI-1-2 connected 1600x1200+0+1200 367mm x 275mm
DVI-1-3 disconnected

If I use either xrandr or the Ubuntu "Screen Display" panel to move the third
screen to be in-line with the other two, either to the right or to the left, it
causes the video on the other two to fail and only the third screen to display
correctly.  The failed screens have video garbage on them and don't change when
I move windows onto them.  Switching to the console (CTRL+ALT+F1) and back
causes the third monitor to re-display correctly but the other two monitors are
now black.  Using the "Apply" button in "Screen Display" refreshes the two
black monitors with more video garbage that changes with every "Apply".

If I move all three screens to be in-line and use the "Screen Display"
"Rotation" option to set the two non-working screens to use any rotation or 180
flip, they clean up and display correctly on their monitors (in rotated or
flipped mode, of course)!

When I restore the "Rotation" back to "Normal" on either screen, the video
fails again with garbage.  Adding back rotation or 180 flip, the video cleans
up again and displays correctly (in rotated or flipped mode, of course).

Things would probably work fine across all three monitors if I could flip 180
all three monitors and stand on my head, but for some reason the "Screen
Display" configuration options allow rotation only on the two adjacent screens
on the one card and not on the third screen on the other card.

It's odd that the video is fine when rotated or flipped, but is garbage when
left as "Normal".  Alas, I can't easily use the screens when rotated or
flipped.

Ubuntu 12.04 Package: xserver-xorg-lts-trusty  1:7.7+1ubuntu8~precise1

Hardware (from lspci):
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
GL [FireMV 2250]
04:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516 GL
[FireMV 2250] (Secondary)
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
GL [FireMV 2250]
05:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516 GL
[FireMV 2250] (Secondary)

Excerpts from /var/log/Xorg.0.log (full log attached):
X.Org X Server 1.15.1
Release Date: 2014-04-13
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.42-54-generic x86_64 Ubuntu
Current Operating System: Linux home 3.13.0-32-generic #57~precise1-Ubuntu SMP
Tue Jul 15 03:51:20 UTC 2014 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic
root=UUID=49af0ade-c356-429f-a723-85d7358f0484 ro
Build Date: 29 May 2014  10:29:10AM
xorg-server 2:1.15.1-0ubuntu2~precise1 (For technical support please see
http://www.ubuntu.com/support) 
Current version of pixman: 0.30.2
...
(II) LoadModule: "radeon"
(II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
(II) Module radeon: vendor="X.Org Foundation"
  compiled for 1.15.1, module version = 7.3.0
  Module class: X.Org Video Driver
  ABI class: X.Org Video Driver, version 15.0

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