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Weird X shutdown behavior

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asdf:
Hi,
I'm running RH7.2 with 2.4.9 on a Dell laptop. It's running just fine (a lot better than Windows!) but sometimes, whenever I exit X (either by logging out of GNOME which dumps me back to gdm, shutting down or rebooting using the GUI, or switching to a text console) my machine locks up and the screen fades to a spooky white. I'm pretty sure that this can't be good for my hardware. This seems to happen with no noticeable patterns, but it seems to happen more often when the AC power isn't on (it happens about 75% of the time.. if it doesn't lock up I'm just lucky). Has anybody experienced similar problems before? Any ideas?

Thanks.

voidmain:
I'm also running RH72 on a Dell laptop (Lattitude 350Mhz w/64MB) and do not have those problems but I do not run Gnome.  I was running KDE for quite some time but switched to Windowmaker since I only have 64MB.  WindowMaker is a lot faster on the laptop.  Do you have the same problem when using KDE (and kdm rather than gdm)?  I have a feeling it's not the window manager though, sounds more like X is not configured quite right.  What version of X are you running?  I'm running 4.1.0.  There is an X update on RedHat's errata, might want to try upgrading...

asdf:
Sorry, I didn't intend to mean this happened only on GNOME (though I do use GNOME). This happens even when I run plain old X without anything and try to shut it down or switch to the text console. I already upgraded XFree86 (well, Red Hat's upgrade at least, not to 4.2). I'm currently running XFree86 4.1.0.

voidmain:
What model laptop are you running?  And what resolution of text mode are you running (80x25, etc).  The text mode resolution is adjustable in the kernel and in the lilo.con (or GRUB conf if that is what you are using).  But be careful changing this on a laptop, very limited number of text modes. I'll do some searching.  From my experience I have had this problem on several models of laptop.  I found that when started in text mode usually no problem, graphics mode is usually no problem but switching from graphics mode back to text mode can be a problem.  I'll check around for suggestions if you let me know the model number.

asdf:
Thanks a lot, but I'm warning you - I've searched everywhere  

I have a Dell Inspiron 4000, which has an ATI Rage Mobility M3 2x AGP in it. My text mode is 80x25. I can start X just fine from the text console but I run into problems (sometimes.. actually, most of the time) when shutting down X or switching to the text console.

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