Bug#443122: xserver-xorg-video-ati: dualhead setup not possible with xrandr1.2
Andreas Pakulat wrote:
> - the dpi setting seems to be set wrongly, I've got a 332x205 laptop
> display (mm) and a 365x275 mm CRT. And xorg sets 96dpi and xrandr tells
> me that the screen size is actually 888x220 mmm??? Right would be
> something like 130dpi
There are some known problems like this one, I think it is being worked
on upstream.
> - I couldn't get a virtual desktop of 3080x1050 with a modeline of
> 1400x1050 for the CRT, X11 always created a 3360x1050 virtual desktop,
> i.e. double the size of the lvds
Not sure about this, maybe the ATI driver insists on using such a size.
If the latest upstream git of the driver does this, it might be worth
sending the corresponding config and log on bugzilla.freedesktop.org.
> - most importantly: I can't start either XFC4 or KDE3 session from that
> xterm or from kdm. As soon as they're up and running the 2nd head is
> switched off and when I set a mode on it again and then use
>
> xrandr --output VGA-0 --left-of LVDS
>
> to put it on the left side of the lvds, but that just makes the whole
> screen go blank :( Maybe this is a xfce/kde issue?
If starting with KDE/XFC works fine on both heads, I would guess that
KDE/XFC does some incorrect RandR 1.2 calls at startup. It is hard to
be sure. Did you check in the corresponding KDE/XFC configuration utilities?
Brice
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