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If you are running in framebuffer mode then I do not think the res can be changed while running X. At least to my knowledge. Then change needs to be made in the /etc/lilo.conf file "vga=" line, lilo written and then rebooted.
If you are running in another mode, then in the screens section it contains the resolutions listed for each color depth. The first listed on the line is the default viewport resolution, and the largest listed defines the desktop area. My default colordepth setting is at 24, so the subsection for 24 bit color will apply and my screens are defined as below for 1280x1024. This is on 17" monitor.
You switch between the different offerings listed by using [ctrl][alt][+] or [-]. The last key must be on the numeric keypad.
If you have higher values listed and they are not working or X refuses to start then look at the monitor definition section. The values provided may not allow for the higher resolutions and will need to be modified if your monitor actually supports it.
My monitor, 17" CTX, is defined as below. I do not know if these values are really respective of my monitor. But they allow the 1280x1024 to work very stable.
If you have your Nvidia kernel driver loaded, then run a /usr/X11/bin/XFree86 -configure. This will automatically generate a /root/XF86Config file (if you are running as root...which you should be). mv that to /etc/X11/XF86Config-4. The auto configuration probes your card for optimum settings. Be sure to edit this new config file and load the NvAGP driver as well. Nvidia's linux drivers were ported from Windows...so my experiences have been better using the Nvidia drivers themselves. You also can change the resolution by setting a DefalutDepth just below the "Display" settings in XF86Config.
Make sure that if you are going into X windows, add the new resolution changes at the front of the line, otherwise, you'll be stuck doing ctrl+alt+ + all the time.
# "1024x768" is also a conservative usable default resolution. If you
# have a better monitor, feel free to try resolutions such as
# "1152x864", "1280x1024", "1600x1200", and "1800x1400" (or whatever your
# card/monitor can produce)
I deleted the lower resolutions from the Config file,
logged out and back in
and seem to be running at a higher resolution than before
XDisplay still says it's 1024x768
I had given up and gone back to Mandrake but then I thought that that was silly so came back to slackware
i downloaded the NVIDIA stuff afresh and the kernel package seemed different this time
don't know if that's related
anyway
problem solved
next problem
how to get the wheel mouse to let me use the wheel
Be sure to to an 'lsmod' to see if 'nvidia' is loaded. If not...the kernel module isn't even running. If not...do a 'modprobe nvidia' and if you have it installed...it should load.
More suggestions below.
Also...you may want to start over with a fresh XF86Config file.
Do '/usr/X11/bin/XFree86 -configure'...then move it to /etc/X11/XF86config-4. Remove any other XF86config or move to a '.old'
# "1024x768" is also a conservative usable default resolution. If you
# have a better monitor, feel free to try resolutions such as
# "1152x864", "1280x1024", "1600x1200", and "1800x1400" (or whatever your
# card/monitor can produce)
Ok I have a newly installed Slackware box here... I am about to run telinit 4 to test the x config but before I do that, I want to make sure that when I start a KDE session the first time that the resolution is going to be 1024x768.
I read somewhere that default resolution is 640x480 when a kde session is started. If the resolution is 640x480 the screen is to small to see the option buttons when KDE Personalization Wizard runs the first time you start a KDE session.
How can you force the starting resolution to be 1024x768 before you start X?
Edit the line in your XF86Config file that talks about bit depth and reslutions. Erase all resolutions before "1024x768" and it will then automagically start X at that resolution. It will always default start to the first resolution listed for that bit depth (in my case it was 1280x1024 or something insane like that).
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