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Re: screen resolution

Dylan Semler wrote:
On 9/9/06, *Aaron Konstam* <akonstam sbcglobal net <mailto:akonstam sbcglobal net>> wrote:

    On Sat, 2006-09-09 at 11:05 -0400, Dylan Semler wrote:
    > On 9/9/06, Aaron Konstam <akonstam sbcglobal net
    <mailto:akonstam sbcglobal net>> wrote:
    >         On Sat, 2006-09-09 at 02:28 +0100, Thufir wrote:
    >         > I'm just starting to research screen resolution.  I
    want to
    >         safely
    >         > increase my screen resolution, but first need to make
    >         on how to
    >         > recover, via the fedora rescue CD, in the event things go
    >         wrong.
    >         >
    >         > At this point I'm just thinking aloud, but please do chime
    >         in!  :)
    >         Once again I am confused. The way I change screen
    >         is:
    >         1. switch to a terminal [crl-alt-F1]
    >         2. change to init level 3 [ init 3]
    >         3. Use : system-config-display to change resolution [it will
    >         adjust
    >         xorg.conf]
    >         4. Change back to init level 5 [init 5]
    > The screen resolution options available in system-config-display are
    > determined by what's in your xorg.conf.  If your xorg.conf isn't
    > properly set up then you won't be able to use that utility to change
    > to your desired resolution without making some changes to xorg.conf.
    > Also, for a one-liner for changing screen resolutions without
    > x, check out xrandr (which has the same limitation as
    > system-config-display I mentioned above)
    As far as I know the only thing that affects screen resolution that
    cannot be done with in system-config-display is the video card
    identification. But as always I am willing to learn something new.

Well now I'm not sure at all. I just checked my system-config-display and the only resolutions available are 640x480 and 800x600. Considering I'm running my laptop screen at 1920x1200 looks like we're both wrong. But i'd put my confidence in what's in the xorg.conf file rather than what system-config-display says.


Most good graphics drivers will ignore the settings for resolution in xorg.conf, and query the monitor itself. Check your /var/log/Xorg.log.0 file and search for 1920z1200. You will see that it set the default by itself.

However, for monitors that don't identify themselves, user system-config-display to set the monitor type, then go back to the resolution tab and all your available screen resolutions will be displayed as options.

To further muddy the waters, most monitors will get picked up correctly by anaconda, but then NOT picked up correctly by the first default run of system-config-display. You will notice the monitor identification by anaconda during the install as stage2 loads.

So, if system config-display doesn't get it right, simply identify your monitor, then select resolution, then save and log out to restart X. Easy, but should not be necessary, I totally agree.

For laptops and almost all LCD displays, the default settings for LDC Panel NNNNxNNNN will work just fine. No need to dig through the long list.

That is because resolution is based upon horizontal and vertical frequencies, and almost all LCDs run at 60HZ anyways.

Some newer LCDs can run at 70-76HZ, so check on the net before taking my word for it.
see: http://www.ephaseone.com/product.asp?PID=MONCTXS700B

Even so, Identifying the monitor to system-config-display has only the effect of making more resolutions available to choose from on the list, but all LCDs should be run at max resolution in any case. (IMNSHO)

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