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X on external VGA


somehow i have problems getting X to work on an external display
connected to my powerbook. Instead of an X display i get a white screen

... ok
copying OF device tree...done
Initializing fake screen: ATY,RageM3p12A
Calling quiesce ...
returning 0x01400000 from prom_init

My configuration is:

- first generation powerbook 400 (with rage 128)

- kernel from benh-rsync: 2.4.20-ben8

- XFree86 Version

relevant parts of XF86Config-4:

Section "Device"
	Identifier	"ATI Rage 128 M3 (Mobility)"
	Screen		0
	Driver		"fbdev"
#	Driver		"r128"
	 BusID		"PCI:0:16:0"
	 Option		"UseFBDev"			"true"

Section "Monitor"
	Identifier	"Apple PowerBook G4"
	HorizSync	30-100
	VertRefresh	50-160
	Option		"DPMS"
	Modeline "1152x768" 64.995 1152 1213 1349 1472  768 771 777 806 -HSync
	Modeline "800x600" 64.995   800  820  840  869  699 610 620 630 -HSync

Section "Screen"
	Identifier	"PowerBook"
	Device		"ATI Rage 128 M3 (Mobility)"
	Monitor		"Apple PowerBook G4"
	DefaultDepth	16
	SubSection "Display"
		Depth		16
		Modes		"1152x768" "1024x768" "640x480"

I tried both the driver r128 an driver fbdev in the device-section. Both
work with the internal display, but for the external it makes no

ATI Rage M3 mirror tool, v0.1
Mirror is currently: lcd: on, crt: on

What am i missing?
If i succeed to show an X-Screen on the external display, is it usable?
I read in the archives that it is "woobly". The screen I the
text-display is perfectly clear.

Any help is appreciated.

	Matthias Kloas

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