[ltp] T42 DVI xorg 7.0

[Alex Deucher]

On 2/14/06, Aidan Marks <aidan@cisco.com> wrote:
> Hi,
>
> T42 running gentoo with radeon 7500 mobility under xorg 7.  I want to
> simply have cloned 1024x768 on the T42 LCD + DVI on the port replicator.
>  Ext LCD is an NEC 2080UX+.
>
> I thought the correct layout was:
>
> Option "MonitorLayout" "LVDS,TMDS"
>
> however with this line, when X is started, the T42 internal lcd fades
> slowly from black to white and freezes the box and nothing appears on
> the ext lcd.  ctrl-alt-backspace does nothing, the box does not respond
> to pings.
>
> However, I can successfully drive the DVI out with:
>
> Option "MonitorLayout" "TMDS"
>
> which leaves the T42 LCD on.  But this only works when attached to the
> port replicator with the DVI.  If not, xorg chokes.  Fair enough I guess?
>
> I have analog CRT working fine.
>
> So why does "LVDS,TMDS" not work and even so, die horribly?
>


The xorg radeon driver does not yet support LVDS plus internal TMDS.=20
I have an experimental patch to re-works the entire output/crtc
mapping stuff, but It still has some problems.  For now you can use
radeontool and a small hack to get it working:

hack:
http://ozlabs.org/~jk/docs/mergefb/

radeon output rework:
http://ozlabs.org/~jk/docs/mergefb/

Alex

> Thanks/Aidan