Changing resolution on laptop

[Dotan Cohen]

On 13/02/07, Aaron Konstam <akonstam at sbcglobal.net> wrote:
> On Mon, 2007-02-12 at 23:23 +0200, Dotan Cohen wrote:
> > On 12/02/07, Aaron Konstam <akonstam at sbcglobal.net> wrote:
> > > On Mon, 2007-02-12 at 16:40 +0200, Dotan Cohen wrote:
> > > > I've a Dell E1505 laptop with a 1050*1400 resolution LCD screen, and a
> > > > regular external CRT monitor that can display video up to 768*1024.
> > > > I'd like to plug the monitor into the laptop's output, but I need the
> > > > output to display 768*1024. How would one go about ensuring that the
> > > > correct resolution is used depending on whether or not the monitor is
> > > > connected?
> > > >
> > > > Googling about led me to a bash script that changes screen resolution,
> > > > but I'd prefer something automatic: LCD always get 1050*1400 and the
> > > > CRT always gets 768*1024.
> > > >
> > > > Thanks in advance for any ideas.
> > > >
> > > This is not exactly automatic but its use depends on the answer to the
> > > following question. When you plug in the external monitor does the
> > > internal lcd screen cease working, If so one might do this.
> > > <ctrl><Alt> + cycles through resolutions in your xorg.conf so if you had
> > > the resolutions you mention above in your xorg.conf file it would be
> > > easy to switch between them.
> >
> > It only drives one display at a time, so I could switch between
> > resolutions. My xorg.conf file has no screen resolutions:
> > # Xorg configuration created by pyxf86config
> >
> > Section "ServerLayout"
> >       Identifier     "Default Layout"
> >       Screen      0  "Screen0" 0 0
> >       InputDevice    "Keyboard0" "CoreKeyboard"
> >       InputDevice    "Synaptics" "CorePointer"
> > EndSection
> >
> > Section "InputDevice"
> >       Identifier  "Keyboard0"
> >       Driver      "kbd"
> >       Option      "XkbModel" "pc105"
> >       Option      "XkbLayout" "us"
> > EndSection
> >
> > Section "InputDevice"
> >       Identifier  "Synaptics"
> >       Driver      "synaptics"
> >       Option      "Device" "/dev/input/mice"
> >       Option      "Protocol" "auto-dev"
> >       Option      "Emulate3Buttons" "yes"
> > #     Option      "UseShm" "true"
> >       Option      "SHMConfig" "on"
> > EndSection
> >
> > Section "Device"
> >       Identifier  "Videocard0"
> >       Driver      "vesa"
> > #     Driver      "radeon"
> > EndSection
> >
> > Section "Screen"
> >       Identifier "Screen0"
> >       Device     "Videocard0"
> >       DefaultDepth     24
> >       SubSection "Display"
> >               Viewport   0 0
> >               Depth     24
> >       EndSubSection
> > EndSection
> >
> You ar right but if you run system-config-display your file will be
> changed so the last part will look like this:
> Section "Screen"
>         Identifier "Screen0"
>         Device     "Videocard0"
>         DefaultDepth     24
>         Option      "passwordfile" "/root/.vnc/passwd"
>         SubSection "Display"
>                 Viewport   0 0
>                 Depth     24
>                 Modes    "1600x1024" "1440x900" "1400x1050" "1280x1024"
> "1280x960" "1280x800" "1152x864" "1152x768" "1024x768" "800x600"
> "640x480"
>         EndSubSection
> EndSection
>
> and you will be able to choose the resolutions you want to use by
> removing the ones you don't want. That is the semi-automatic way to do
> this , but of course you could just type the lines in with the right
> resolutions, Then restart X.
>

I added the line and restarted X. Now, it's stuck in "768*1024", and
CTRL-ALT-+ does not switch resolutions. I'll go back to my backup of
xorg.conf, but why will it not switch?

Note, that before I added the line, CTRL-ALT-+ did switch resolutions,
but 768*1024 was not amoung the available resolutions. This was with
no resolutions defined at all in xorg.conf.

Dotan Cohen

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