[Bug 34441] radeon 16-bit brokenness in dual-screen setup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34441

Arno Schuring <aelschuring at hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|radeon 16-bit brokenness    |radeon 16-bit brokenness in
                   |                            |dual-screen setup

--- Comment #2 from Arno Schuring <aelschuring at hotmail.com> 2011-02-19 07:00:41 PST ---
I could probably perform a bisection if needed, yes, but I'm not looking
forward to it; I suspect that bisecting only the -video-radeon driver will not
be enough, because of the ABI bump between xserver 1.7.7 and 1.9.4. But if you
could provide some pointers to the correct upstream trees/branches, I'll see
what I can do.

Anyway, I've found some more time to try different things out, and it seems
that things are not all dire: 16-bit mode works as expected if I start in
single-screen and then use xrandr to re-enable dual-screen mode. I've also
encountered two possible bugs with xrandr, but I have been able to reproduce
both on 24-bit as well, so they're not the cause.

I'll list them anyway:
- xrandr CRTC assign seems iffy. When moving from clone mode to dual-display
mode, both displays are not reassigned to separate CRTCs. I'll open a new bug
for this
- xrandr --verbose still lists the displays as Clones, even after succesfully
enabling dual-display mode. Probably a cosmetic issue, I'll open a new bug if
you want me to


Maybe the issue is simply that I'm using the wrong xorg.conf entries, I'll
attach it and list the relevant entries here:
Section "Monitor"
[...]
        Option      "Rotate"         "left"
        Option      "Position"       "1280 -896"
Section "Screen"
[...]
        SubSection "Display"
                Virtual    2360 1920

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