[Bug 12476] New: PreferredMode freezes xserver 1.4

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=12476

           Summary: PreferredMode freezes xserver 1.4
           Product: xorg
           Version: 7.3
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: sargentd at die-welt.net
         QAContact: xorg-team at lists.x.org


I have a ThinkPad X31 with an ATI Technologies Inc Radeon Mobility M6 LY (r100
afaik) which serves two screens, the 1024x768 internal one, and a 1280x1024
external one. Latest radeon randr-1.2 git used as the driver.
For the last one to automaticaly start at the right resolution and extend my
desktop, I have an entry in my xorg.conf which looks like:
Section "Monitor"
        Identifier      "VGA"
        Option          "DPMS"
        Option          "RightOf"       "LVDS"
        Option          "PreferredMode" "1280x1024"
EndSection

Today I've upgraded to Xorg 7.3 (had 7.2 before, on Debian unstable) and after
a restart, X freezed (what 7.2 did not), but system was still reachable via
SSH, so I've killed X and restarted it again, which again gave me a freeze. I
killed it once more, pulled out my external screen and started X again - it
worked without problems.

After some debugging (trying older radeon driver, the latest git, different
options etc) I found out, that X freezes only when PreferredMode is set, either
for the internal or for the external screen.
When I remove the option I can start X without problems, but the external
screen is at 1024x768 (what looks really ugly on a cheap LCD designed for
1280x1024).
However, after successful start and login, I can use "xrandr --output VGA-0
--mode 1280x1024 --right-of LVDS" to set the screen correctly up.

I will attach a Xorg.log of a freeze with latest radeon git
(2fbbd9c5f0ec27e72780e8b054bc59502f1e5651) and PreferredMode set for the
internal screen.
Please let me know, if I can supply any other information.

Regards
Evgeni


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