Screen resolution
 

Alrighty then, I'm using Slackware 9.1, KDE and I think the default screen resolution was 800 x 600. I changed it to 1152 x 870 but I can't really notice any difference. It looks the same and when I was going to stretch the entire picture on my screen it said 800 x 600 in the bottom.
Now, when I check the settings it says 1152 x870. Is there a way to see if it really is what is says it is? And, if it's not what it says it is, how do I change it?

xdpyinfo tells you all about what's really going on.

X allows you to set a display size to one thing, but only display a part of it - for example, your disply size might by set to 1152x870, but only 800x600 pixels are shown on the screen. This is called zooming. You can test this by using Ctrl-Alt-Num+ and Ctrl-Alt-Num-.

Re: Screen resolution
 

How/where did you change it?

In KDE (which version, btw?) you can at least
use kcontrol to display the settings (and in 3.1.4
you can change them, too).

Another way to find out what you're actually
using would be to look at /var/log/XFree86.0.log

Cheers,
Tink

I changed it at Peripherals - Display.
When typing xdpyinfo it says:
Dimensions 800x600 pixels
And K X Config says:
1280x1024/61hz Color depth 24

Did you restart X after changing it?

Log out, and then <Ctrl>+<Alt>+<BckSpc>

Cheers,
Tink

I restarted my computer and I also turned it off and on.
<Ctrl>+<Alt>+<BckSpc> doesn't seem to do anything for me though. I tried it when logging out the user and where I'm at the text thing to log in with a user or so. Wrong place?

nuh ... I gather you're starting x from
the command-line using startx and
not through a graphical login :)

The next thing to look at is to find
out whether X and K control look
at the same file...

cd /etc/X11
ls -ltr

Have you got several files starting
with XF86Config?
Which file is X actually using? Look
in /var/log/XFree86.0.log

Cheers,
Tink

I'm not sure what I did but it got changed now :)
Does <Ctrl>+<Alt>+<BckSpc> do anything without showing that it actually does something? 'Cause I tried it but nothing seemed to happen so I assumed it didn't work.

It didn't .... the hotkeys restart the X server.

Cheers,
Tink