xorg.conf PreferredMode resolution ignored in ATI video driver

[Don Waugaman]

On Mon, Jun 23, 2008 at 9:57 AM, Alex Deucher <alexdeucher at gmail.com> wrote:

> On Mon, Jun 23, 2008 at 11:14 AM, Don Waugaman <dpw at cs.arizona.edu> wrote:
> > Greetings,
> >
> > I have an asymmetric dualhead setup - 1920x1200 LCD on the left,
> > 1600x1200 CRT on the right - and I'm trying to get a static xorg.conf
> > setup working without resorting to xrandr every time I log in.  (Getting
> > the screen resolution to native on the LCD monitor under GDM would be a
> > plus.)
> >
> > I'm using Fedora 9 with xorg-x11-drv-ati-6.8.0-14 on an ATI 9550-based
> > card, by the way.
> >
> > Upon X startup, the LCD sets itself to 1600x1200:
> >
> > Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 3520 x 1200
> > VGA-0 connected 1600x1200+1600+0 (normal left inverted right x axis y
> > axis) 0mm x 0mm
> >   1600x1200 at 75Hz   75.0*+
> >   1360x768       59.8
> >   1152x864       60.0
> >   1024x768       60.0
> >   800x600        60.3
> >   640x480        59.9
> > DVI-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis)
> > 518mm x 324mm
> >   1920x1200      60.0 +   60.0
> >   1600x1200      60.0*    60.0
> >   1680x1050      60.0
> >   1600x1024      60.2
> >   1400x1050      74.8     70.0     60.0
> >   1280x1024      75.0     60.0     60.0
> >   1440x900       59.9
> >   1280x960       60.0     60.0
> >   1360x768       59.8
> >   1152x864       75.0     75.0     75.0     70.0     60.0
> >   1024x768       75.1     75.0     70.1     60.0
> >   832x624        74.6
> >   800x600        72.2     75.0     60.3     56.2
> >   640x480        75.0     72.8     72.8     75.0     66.7     60.0
> > 59.9
> >   720x400        70.1
> > S-video disconnected (normal left inverted right x axis y axis)
> >
> > I can change it to use 1920x1200, and also rebase the VGA to the
> > screen's right to eliminate the overlap, but I'd prefer to not have to
> > do this every time I log in.
> >
> > I noticed the following lines in my Xorg.0.log:
> >
> > (II) RADEON(0): Using user preference for initial modes
> > (II) RADEON(0): Output VGA-0 using initial mode 1600x1200 at 75Hz
> > (II) RADEON(0): Output DVI-0 using initial mode 1600x1200
> >
> > which seems odd since my preference in the file is for the 1920x1200
> > mode.  Is there a bug in the X server preventing this from being
> > selected somehow?  Is it selecting a mode to match the CRT head?
> >
> > Also, periodically the X server's CPU utilization goes through the roof,
> > and interactivity pauses briefly.  After about 3-5 seconds, it picks
> > back up again.  These pauses are annoying, and they really interfere
> > with the work cycle - is there a way to figure out why this is happening
> > and what can be done about it?
> >
> > If there is a better forum for asking these kinds of questions, feel
> > free to direct me to it.
> >
> > I'm attaching my current xorg.conf, I can send the server log as well if
> > it would help, but it's rather larger and I'd hate to take up so much
> > bandwidth.
>
> Wht xserver are you using.  I think this has been fixed in git master
> and the 1.5rc releases.
>
> Alex
>

It's the current Fedora xserver package, so it's a little hard to say. :-)

The rpm version string is 1.4.99, and the source file in the srpm is
xorg-xserver-20080612.tar.bz2.  It looks like that was generated by checking
out commit #53a84d75c65f75c629c6610a2ec4093507cea3f7 from git://
git.freedesktop.org/git/xorg/xserver, assuming that my rpm-fu is strong
enough to understand the setup.

It appears, though, that this didn't come from the server-1.5-branch, since
that's in the other arm of the script used to make the git snapshot.  So it
looks like I'll have to wait for a 1.5-based server to make this work.

Out of curiousity, is there a way to look for the commit that fixed this?  I
could try turning it into a patch and rebuilding the rpm to see if it fixed
the problem.

Thanks,

Don
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