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Bug#332548: xserver-xorg: breaks dual-head on radeon: more info

On Thu, Jan 05, 2006 at 09:27:36PM +0100, Dominique Dumont wrote:
> Lionel Elie Mamane <lionel@mamane.lu> writes:

>> Section "Device"
>> 	Identifier	"ATI Radeon 9200 SE Primary"
>> 	Driver		"ati"
>> 	BusID		"PCI:2:0:0"
>> #	Option		"CloneMode"	"1280x1024"
>> #	Option		"CloneDisplay"	"0"
>> 	Screen		0
>> #        Option          "UseFBDev"              "true"
>> 	Option		"MergedFB"	"false"
>> #       Option		"DDCMode"	"true"
>> EndSection

> On my radeon 9200, forcing MergedFB to false breaks the video output
> on the secondary head. (no signal at all on the video output).

I didn't seriously try to get MergedFB dual-head working; I don't want
dead unreachable spots in my desktop, nor floating viewports.

> PS: In all cases, the VT (CTRL-ALT-F1 to CTRL-ALT-F6) are garbled:
> the color and oveall layout is there, but the character are
> unreadable as if each character display is individually (but
> similarly) mucked up.

That one (as well as the need to boot with the LCD unplugged) got
solved for me by upgrading the kernel. Not sure when it started
working, but 2.6.12 works. I get it back if I use "IgnoreEDID" for the
primary device (that serves the LCD).


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