screen resolution

[Rick Stevens]

On 02/09/2012 02:30 PM, Aaron Konstam wrote:
> <snip>
>>>> If you don't see your 1920x1080 in there, then you can forcing it by
>>>> trying "xrandr --mode 1920x1080" to see if that'll bite.  If it does,
>>>> then you can add appropriate lines to your xorg.conf file.
>>> tried what yoou suggest. Although man xrandr says there is a --mode
>>> option when I run xrandr --mode I get a response that the option does
>>> not exist. Why is that?
>>
>> Ah, yes.  Try "xrandr --fb 1920x1080".  I think "--mode" was for a
>> previous version of xrandr.  Did just "xrandr" show the ability to do
>> 1920x1080?  I'm trying to see if your monitor or cable just isn't
>> reporting the EDID info properly.
> I am not the original poster but I was just trying this method to
> configure my screen. In my case 1280x1024. When I ran:
> xrandr --fb 1289x1024
> I got the error message:
> xrandr: Failed to get the size of gamma for output default.
>
> What does that mean?

I've been playing with this.  First off, do "xrandr" all by itself to
find out what your outputs are called.  In my case, here's what I see:

[root at prophead ~]# xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DVI-I-1 connected 1920x1080+0+0 (normal left inverted right x axis y 
axis) 598mm x 336mm
    1920x1080      60.0*+   60.0
    1600x1200      60.0
    1680x1050      60.0
    1280x1024      75.0     60.0
    1440x900       59.9
    1280x960       60.0
    1152x864       75.0
    1024x768       75.1     70.1     60.0
    832x624        74.6
    800x600        72.2     75.0     60.3     56.2
    640x480        72.8     75.0     66.7     60.0
    720x400        70.1
DVI-I-2 disconnected (normal left inverted right x axis y axis)

So, I actually have two outputs, one called "DVI-I-1" (which is the
active one and is currently in 1920x1080 mode) and "DVI-I-2" (which
isn't hooked up to a monitor right now).  My active monitor can handle
all the modes listed below it.  To change to 1600x1200 mode:

	xrandr --output DVI-I-1 --mode 1600x1200

I just did this on my laptop (F16) to prove the concept and it did
work.  The missing gamma thing is because you didn't specify an output,
and the "--mode" does work, but only when "--output" is also specified.

I should read the man pages more thoroughly myself.  Sorry if I
confused anyone.  You may now hurl angry birds at me if you wish.
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- Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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