Changing monitor resolution on 12.04

[Jim Byrnes]

On 12/12/2012 12:31 PM, James wrote:
>
> There may be an easier way but...
>
> At the command prompt enter: 'xrandr'
>
> Your output will resemble:
> ---
> Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 4096 x 4096
> VGA-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 0mm x
> 0mm
>     1024x768       60.0
>     800x600        60.3     56.2
>     848x480        60.0
>     640x480        59.9
>     1600x1200_70.00   69.9*
> ---

As a test I did it on my working 10.04 dual monitor setup to see what 
the output would look like.

~\ $ xrandr
Screen 0: minimum 3840 x 1080, current 3840 x 1080, maximum 3840 x 1080
default connected 3840x1080+0+0 (normal left inverted right) 0mm x 0mm
    3840x1080      50.0*



> Record the DisplayDesignator in line two. (“Mine is VGA-1”)

Mine seems to be quite a bit less informative and it only displays info 
about one monitor.

> Using the documentation for your equipment, determine a valid resolution and
> refresh rate.
> I'm using 1600x1200 at a refresh of 70.
>
> At the command prompt enter: 'cvt <res_X> <res_Y> <RefreshRate>'
> For example: cvt 1600 1200 70
>
> Your output will resemble:
> ---
> # 1600x1200 69.92 Hz (CVT) hsync: 87.55 kHz; pclk: 190.50 MHz
> Modeline "1600x1200_70.00"  190.50  1600 1720 1888 2176  1200 1203 1207 1252 -
> hsync +vsync
> ---
>
> Record the Mode and Modeline from the second line.
>
> At the command prompt enter:
> xrandr --newmode <Modeline>
> xrandr --addmode <DisplayDesignator> <Mode>
> xrandr --output <DisplayDesignator> --mode <Mode>
>
> For example, I use:
> xrandr --newmode "1600x1200_70.00"  190.50  1600 1720 1888 2176  1200 1203
> 1207 1252 -hsync +vsync
> xrandr --addmode VGA1 1600x1200_70.00
> xrandr --output VGA1 --mode 1600x1200_70.00
>
> This will change your monitor resolution.
> To make these changes permanent add the three 'xrandr' lines to end of:
>     /etc/kde4/kdm/Xstartup

You seem to be on kde, I am on Unity/Gnome and don't seem to have a 
Xstartup file.

This got me thinking.  I have a perfectly working twinview setup on 
10.004. I just compared the two xorg.conf files. The 10.04 one has 
references to two monitors and screens and the 12.04 one refers to only 
one.  I wonder if it is as simple as copying the 10.04 xorg.conf to 
12.04?  Probably not but I think I will give it a try later.

Thanks,  Jim

> (Sarcastic unnecessary comment:
>   Any modern operating system aught to be able to accomplish what Windows 95
> could do nearly 20 years ago, but I guess this is the new and improved Linux.)
>