[Bug 23665] New: [RS690] widescreen blinks to black with virtualbox

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23665

           Summary: [RS690] widescreen blinks to black with virtualbox
           Product: xorg
           Version: 7.4
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: bryce at canonical.com
         QAContact: xorg-team at lists.x.org


Forwarding this bug from Ubuntu reporter Gegio0:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/374413

[Problem]
In testing a recent git snapshot of -ati under virtualbox, it was found to
cause very bad flickering.  No flickering is seen when running with a regular
install with no virtualbox.

[Original Description]
I have a LG M227WD widescreen monitor and an integrated ati X1250-based
graphics in my Gigabyte MA69GM-S2H motherboard; monitor and graphics are
connected through an HDMI cable.

When I am in ubuntu (9.04, fully updated) my monitor blinks to black very often
(usually every 3 seconds, but sometimes it blinks even 3-4 times in fast
succession) and remains black for about 1 second (again, sometimes it stays
black for way more seconds).

On the same machine I have a windows xp installation that works just fine.
Problem seems not to arise in gdm login screen.
I have no xorg.conf file.

Please, consider that this is rendering the ubuntu side of my machine nearly
unusable.

I've tested the 1:6.12.99+git20090825.fc74e119 packet for a dozen of hours and
I can now say that:
* flickering is almost gone (apart from one flicker just after upgrading and
another after a restart, I've seen no other flickering) for classic usage;
but
* flickering is much worse now using virtualbox (I use a windows xp with
virtualbox guest additions).

Architecture: i386
DistroRelease: Ubuntu 9.04
Package: xorg 1:7.4~5ubuntu18
ProcEnviron:
 LANG=en_US.UTF-8ProcVersion: Linux versusernamen 2.6.28-11-generic
(buildd at palmer) (gcc versusernamen 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #42-Ubuntu
SMP Fri Apr 17 01:57:59 UTC 2009
SourcePackage: xorg
Uname: Linux 2.6.28-11-generic i686

[lspci]
00:00.0 Host bridge [0600]: ATI Technologies Inc RS690 Host Bridge [1002:7910]
        Subsystem: Giga-byte Technology Device [1458:5000]
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc RS690 [Radeon
X1200 Series] [1002:791e]
        Subsystem: Giga-byte Technology Device [1458:d001]


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