[ltp] x31, dualview with xrandr and 1680x1050

[Alex Deucher]

On Dec 15, 2007 2:55 AM, Toens Bueker
<toens.bueker@lists0903.nurfuerspam.neuroserve.de> wrote:
> Hi *,
>
> at work I just received a new display. As I have just
> changed from crt to tft at home, I thought, I could do the
> same at work.
>
> At home I use a 19'' tft with 1280x1024 resolution. In
> order to get more desktop space, I use xrandr to use the
> lcd of the x31 and the tft in a dualview configuration:
>
>  xrandr --output VGA-0 --right-of LVDS --mode 1280x1024 --rate 60
>
> At the same time I've changed the Virtual setting in
> xorg.conf to (1024 + 1280 = 2304):
>
>  Virtual 2304 1024
>
> Everything works as expected. With a windowmanager, which
> supports xrandr (xmonad), windows can be moved between
> screens but can display different virtual desktops as well.
>
> Now the problem: Changing the virtual line taking into
> account the display size (1680x1050) of the tft at work, X
> no longer starts. The virtual line in question is
>
>  Virtual 2704 1818
>
> "X no longer starts" is probably wrong. Actually the lcd
> of the x31 becomes dark, but if I look really close, I see
> a dialog box (probably from gdm), but I cannot read the
> error message.
>
> Any ideas? Is there anybody out there, who uses an x31
> with a 1680x1050 tft in a dualview configuration?

2704x1818 =~ 19 MB at 4 bytes per pixel (depth 24) which is more vram
than the chip has.  If you are using depth 24, try switching to depth
16 which will cut you down to ~9.5 MB.

Alex