[GRLUG] Xnest/Xephyr

[Jeff DeFouw]

On Sun, Aug 28, 2011 at 10:24:01PM -0400, John-Thomas Richards wrote:
> On Sat, Aug 27, 2011 at 09:34:40PM -0400, Jeff DeFouw wrote:
> > On Sat, Aug 27, 2011 at 08:14:43PM -0400, John-Thomas Richards wrote:
> > > I need to login as another user with a fully-functioning X session.  I
> > > can accomplish this easily enough via
> > > 
> > >    gdmflexiserver --xnest
> > > 
> > > However, that produces a window of just 640x480???not enough to do much of
> > > anything with.  Google reveals lots of people asking the question but I
> > > cannot find a definitive answer on how to increase this window size.
> > > Even 1024x768 would be workable, though I would prefer just about
> > > anything up to 1920x1080.
> > > 
> > > One suggestion was to add the line
> > > 
> > >    [daemon]
> > >    Xnest=/usr/bin/Xephyr -screen 1280x800 -extension RANDR
> > > 
> > > to /etc/gdm/gdm.conf but that has no effect.  Any ideas?
> > 
> > Are you using gdm3?  Looks like it's now "NestedXserverCommand" in 
> > /etc/gdm3/daemon.conf.  The default (on Debian unstable) calls 
> > "/usr/share/gdm/gdmXnestWrapper -br -audit 0".
> 
> Yes, I am.  Thanks for pointing me in that direction.  I cannot find any
> documentation on it (gdm3).  Googling "NestedXserverCommand" does not
> provide any links that are useful to me.  

I found it in the /usr/share/gdm/gdm.schemas file, which is supposed to 
contain a list of all the config file options for gdm3.  Based on that, 
you would want something like

[daemon]
NestedXserverCommand=/usr/bin/Xephyr -audit 0 -screen 1280x800 -extension RANDR

in /etc/gdm3/daemon.conf.

-- 
Jeff DeFouw <mrj at plorb.com>

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