Forcing xorg into extended vesa mode 1024x768

My computer has an ATI Radeon 9200 graphics card, which has been working fine
at a resolution of 800x600 with the open source radeon driver. However, I have
recently acquired a new monitor, which is capable of operating at 1024x768
and I would like to switch to this mode.

Examining /var/log/Xorg.0.log, I see a load of ModeLine entries as follows:

(II) RADEON(0): Modeline "1024x768"x0.0 94.50 1024 1072 1168 1376 768 769
772 808 +hsync +vsync (68.7 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 78.80 1024 1040 1136 1312 768 769
772 800 +hsync +vsync (60.1 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 75.00 1024 1048 1184 1328 768 771
777 806 -hsync -vsync (56.5 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771
777 806 -hsync -vsync (48.4 kHz)
(II) RADEON(0): Modeline "1024x768"x0.0 44.90 1024 1032 1208 1264 768 768
776 817 interlace +hsync +vsync (35.5 kHz)
(II) RADEON(0): Modeline "1024x768"x84.9 94.50 1024 1096 1200 1376 768 771
775 809 -hsync +vsync (68.7 kHz)

My /etc/X11/xorg.conf file contains the following entries:

Section "Device"
Identifier "Radeon Card"
Driver "radeon"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
Option "PreferredMode" "1024x768"
HorizSync 28-40
VertRefresh 43-60
ModeLine "1024x768" 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Radeon Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

When I start the X session, I am getting an entries in /var/log/Xorg.0.log as
follows:

(II) RADEON(0): Output VGA-0 using monitor section Generic Monitor
(**) RADEON(0): Option "PreferredMode" "1024x768"
(II) RADEON(0): I2C bus "VGA-0" initialized.

(II) RADEON(0): RandR 1.2 enabled, ignore the following RandR disabled message.
(WW) RADEON(0): Option "PreferredMode" is not used
(--) RandR disabled

(II) RADEON(0): Output VGA-0 using initial mode 800x600

xvidtune confirms that the display is in 800x600 mode.


I then deleted the "800x600" "640x480" entries from /etc/X11/xorg.conf, leaving
only entries for "1024x768", but I still get an 800x600 display.

How do I force the display to 1024x768?

I am using Debian if that matters.

Thanks in advance to anyone who can help.

Mark.

--
Mark Hobley
Linux User: #370818 http://markhobley.yi.org/
.

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