https://bugzilla.novell.com/show_bug.cgi?id=360342
User sndirsch@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=360342#c8
--- Comment #8 from Stefan Dirsch 2008-02-11 07:20:53 MST ---
SaX2 creates a single head configuration by default. In your case with a
1280x1024 resolution. (Not sure why it creates one with 16bit color depth. It
should be a 24bit one for the radeon driver.) This is what happens when using
the LiveCD. It is my understanding that the configuration can be changed and
the new X11 configuration will be used the next time the system is booted or
xdm/kdm/gdm is restarted.
Unfortunately the driver detects the wrong resolution for your TFT monitor,
probably due to broken DDC data provided by the monitor.
(II) RADEON(0): Validating modes on Primary head ---------
(II) RADEON(0): DFP table revision: 3
(II) RADEON(0): Panel infos found from DDC detailed: 1920x1200
(II) RADEON(0): Valid Mode from Detailed timing table: 1920x1200
(II) RADEON(0): Valid Mode from Detailed timing table: 1600x1200
(II) RADEON(0): Valid Mode from established timing table: 1024x768
(II) RADEON(0): Valid Mode from established timing table: 800x600
(II) RADEON(0): Total of 4 mode(s) found.
(II) RADEON(0): Total number of valid DDC mode(s) found: 4
The largest possible mode is 1024x768 (<=1280x1024), which is chosed
therefore.
By default the driver tries to setup a MergedFB (=Dualhead) configuration,
which is wrong IMHO. I'll try to fix this behaviour.
Try the options
Option "DDCMode" "off"
Option "MergedFB" "off"
in Section "Device" of /etc/X11/xorgh.conf for now. Let me know if this helps
to fix the single head configuration for your TFT monitor.
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