If you add the option vga=0x318 to the kernel boot, it stops working, the command xstart, writes an error:
[root@node0 ~]# startx
xauth: creating new authority file /root/.serverauth.4559
X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.18-164.11.1.el5 x86_64 Red Hat, Inc.
Current Operating System: Linux node0 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64
Build Date: 06 March 2010
Build ID: xorg-x11-server 1.1.1-48.76.el5
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Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Oct 19 06:25:35 2010
(EE) Unable to locate/open config file
New driver is "mga"
(==) Using default built-in configuration (55 lines)
Fatal server error:
Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices
XIO: fatal IO error 104 (Connection reset by peer) on X server ":0.0"
after 0 requests (0 known processed) with 0 events remaining.
If you remove vga=0x318 from the menu.lst, then xstart is loaded, but it is low resolution.
How to make a console with vga=0x318 and xstart worked in 1024x768?