[ltp] x31, dualview with xrandr and 1680x1050

[Alex Deucher]

On Dec 17, 2007 3:23 PM, come se fosse antani <antani@gmail.com> wrote:
> On Dec 17, 2007 6:28 PM, Alex Deucher <alexdeucher@gmail.com> wrote:
>
> >
> >
> >
> > On Dec 17, 2007 12:17 PM, come se fosse antani <antani@gmail.com> wrote:
> > > On Dec 15, 2007 8:47 PM, Alex Deucher < alexdeucher@gmail.com> wrote:
> > >
> > > > 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.
> > > >
> > > Hi.
> > > Sorry for the thread hijacking.
> > > I have a thinkpad x40  and I think the video chipset is the same as the
> one
> > > in the X31.
> >
> > It's not the same.  the x40 is intel based.
> >
> >
> > > How can I know the maximal resolution I can obtain in dual view?
> > > I don't care about depth (16 would be fine) but I'd like to use a
> 1440x900
> > > on external vga since on non-16:9 resolutions my external lcd sucks.
> >
> > The intel driver works similarly to the radeon driver so the same
> > things apply (more or less).
> >
> >
> >
>
> can you point me to some resource to understand how the radeon/intel hw
> works and which external resolution can I obtain?

http://www.intellinuxgraphics.com/dualhead.html