[ltp] x31, dualview with xrandr and 1680x1050

[Alex Deucher]

On Dec 17, 2007 4:07 PM, come se fosse antani <antani@gmail.com> wrote:
>
>
> On Dec 17, 2007 9:39 PM, Alex Deucher <alexdeucher@gmail.com> wrote:
> >
> >
> >
> > 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
> >
> >
> >
> thank you for the link.
> In that page I can't found any information about the limit (of xrandr's
> virtual size) that can reach the video chipset or how can I calculate it.
> in the hardware  matrix I found only one laptop with my chipset, the 855GM.
> it's a Dell Latitude D505 and the user says that he was able with
> 915resolution to set the res to 1400x1050. Googling for this laptop I found
> that the 15'' has an internal LCD with a max res of 1400x1050, so I would
> guess that he's not speaking about external resolution.
> I tried with gutsy with the new xorg configuration tools (for both internal
> and external resolution) but with no luck: either the external LCD gives me
> a "input not supported" or X.org doesnt start at all.
> can you give some (more) resources to read to understand this points?

The max 3D surface on the i945 and below is 2048x2048.  I *think* you
can use total desktop larger than that (by specifying a larger virtual
size) but you won't be able to use 3D.  For i965 the limit is
8192x8192.  You don't need to worry about applications like
915resolution or 855resolution any more since the newer intel drivers
have full mode setting support.

Alex