[ltp] x31, dualview with xrandr and 1680x1050

[Alex Deucher]

On Dec 18, 2007 8:09 AM, come se fosse antani <antani@gmail.com> wrote:
>
>
> On Dec 17, 2007 10:21 PM, Alex Deucher <alexdeucher@gmail.com> wrote:
> >
> >
> >
> > 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.
> >
>
>
> Thank you for the answer. You writes about 3d limitation but not XVideo
> output, right? I remember that some months ago Xinerama had problems with
> vga-out and XV on external screens.

Xv is probably ok, but I'm not that familiar with the HW.

> If the limit is 2048x2048 with 3d (and compiz) I guess I can't use the
> resolution of my external LCD, 1440x900. :(
> Do you know if it's possible to have a part of the screen with 3d and the
> second one without? I know that speaking about virtual size doesn't make
> sense making distinctions between phisical screen, but I'd like to know if
> such configuration is even possible.

I don't think so as IIRC, the stride register for the 3D engine is the
limiting factor.

> Or: there is any work around to obtain a 1024x768 internal resolution and a
> 16:10 resolution on my external LCD with compiz and xv?
>

sure.  how about putting the external monitor above or below the built in panel?

Alex