[Xen-users] Problem setting up VNC on SLES10 HVM DomU

[Evan Lavelle <sa212+xen@xxxxxxxxxxx>]

I've just uneventfully installed SLES10 as an HVM DomU (after finding 
out, the hard way, that OpenSUSE 10.3 won't install on Intel VT).
This almost went without a hitch, but I've been banging my head against 
a brick wall for a few hours trying to get VNC working. I can get a 
remote desktop, but a few seconds after I log in to the remote desktop, 
the screen goes blank (just after I get the "Suse linux enterprise 10" 
screen). Bizarrely, the SLES10 screen saver *does* appear on the remote 
desktop a few minutes later. Another odd thing is that the SDL window on 
my Dom0 has exactly the same behaviour: when I log in on the remote vnc 
client, I get some startup activity on the SDL window for a few seconds, 
and then it goes blank. The screensaver starts on the SDL window at the 
same time as on the vnc client. The only way I can talk to the DomU is 
on ssh.
Any ideas? I'm pretty sure that the vnc setup is correct on the DomU. 
I've enabled it via 'remote administration' on YaST, xinetd is running, 
I can mod /etc/xinetd.d/vnc, etc (and I can log in anyway, so it must 
basically be working).
I'm using a realVNC client, but SLES appears to use tightVNC. I don't 
think this is a problem. I can start a local tightVNC viewer on the DomU 
(with ssh -X), and it has exactly the same behaviour as the remote one 
(though possibly without the screensaver).
Another potential issue is that the relevant stuff on Google generally 
talks about using xdm, but SLES10 uses gdm by default, although I can't 
see how this could be relevant.
Any thoughts? /etc/sysconfig/displaymanager currently contains (I've 
tried some variants):
DISPLAYMANAGER="gdm"
DISPLAYMANAGER_REMOTE_ACCESS="yes"
DISPLAYMANAGER_ROOT_LOGIN_REMOTE="yes"
DISPLAYMANAGER_STARTS_XSERVER="yes"
DISPLAYMANAGER_XSERVER_TCP_PORT_6000_OPEN="yes"
DISPLAYMANAGER_AUTOLOGIN="evan"
DISPLAYMANAGER_PASSWORD_LESS_LOGIN="no"
DISPLAYMANAGER_AD_INTEGRATION="no"
DISPLAYMANAGER_SHUTDOWN="root"

Thanks -

Evan

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