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I have an old Proliant DL380 G4, dual 3.6 GHz Xeons, 6GB RAM. I installed CentOS 6.2 and added X during the install. When I startx, I get kind of a blue screen with three little icons. No menus or anything. No way to exit. Ctrl-Alt-Backspace doesn't work. Sometimes I can Ctrl-Alt-Fx to another console and kill all X processes to end it, but sometimes that strange desktop just freezes solid and I have to pull the power.
1) How can I find out what WM it's actually using?
2) How can I specify which WM to use?
3) How can I get it to exit without a hard reboot so I can look in the logs to see why it's acting weird?
4) Is there an X configuration utility I can run from the command line? There used to be one years and years ago, and it was very useful to find a working X config!
You should be able to inspect /etc/X11/xinit/Xclients. It sources /etc/sysconfig/desktop to find out what desktop to use, but uses a couple of different fallbacks if the preferred/specified one doesn't work out.
Use "yum grouplist" and see if you've got Desktop, Desktop platform, and General putpose desktop installed.
I was missing one of the three, so I installed it. Now I get menus, but no mouse pointer, and no key combination seems to do anything.
[me@localhost ~]$ yum grouplist
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Group Process
Loading mirror speeds from cached hostfile
* base: mirror.anl.gov
* extras: centos.mirror.nac.net
* updates: centos.aol.com
Client management tools
Console internet tools
Dial-up Networking Support
General Purpose Desktop
Graphical Administration Tools
Hardware monitoring utilities
Large Systems Performance
Legacy UNIX compatibility
Legacy X Window System compatibility
Messaging Client Support
NFS file server
Network Infrastructure Server
Network file system client
Systems Management Messaging Server support
X Window System
iSCSI Storage Client