[Bug 81476] 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

Ian! D. Allen <idallen at idallen.ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |---

--- Comment #2 from Ian! D. Allen <idallen at idallen.ca> ---
(In reply to comment #1)
> Your desktop is too large for the 3D engine.  The max surface size
> supported by the r5xx 3D engine is 4096x4096.  1600*3 = 4800 pixels.
> That's why it only works above and below.

I don't think that is the problem:

1. I'm not asking any one FireMV card to do more than two 1600x1200 monitors;
that's only 3200x1200 pixels per card, well within 4096x4096.

2. Three adjacent monitors works fine (no video garbage) if I flip 180 the two
affected screens.  (But then of course I can't use those screens unless I
physically turn those two monitors upside-down!)  Here's the relevant xrandr
output for this working configuration, with the first two screens inverted:

Screen 0: minimum 320 x 200, current 4800 x 1200, maximum 8192 x 8192
DVI-0 connected primary 1600x1200+0+0 inverted (normal left inverted right x
axis y axis) 367mm x 275mm
DVI-1 connected 1600x1200+1600+0 inverted (normal left inverted right x axis y
axis) 367mm x 275mm
DVI-1-2 connected 1600x1200+3200+0 367mm x 275mm
DVI-1-3 disconnected

3. The failure is always on the card with the two monitors, even if I configure
the third monitor to the left of those two.  If I was going out-of-bounds,
surely moving the screen from one side to the other side would affect where the
error appeared?

4. Is the software really so badly written that it can't tell me that I'm going
out-of-bounds?  I get no error from xrandr for the three-adjacent layout.

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