Howto override wrong EDID information?

[Alex Deucher]

On Mon, Aug 30, 2010 at 6:14 AM, Clemens Eisserer <linuxhippy at gmail.com> wrote:
> Hi,
>
> I would like to use an iiyama X436S at 1280x1024 on VGA1 with my
> Laptop, unfourtunatly it seems the EDID information the monitor sends
> is bogus:
>
>> VGA1 connected (normal left inverted right x axis y axis)
>>   1024x768       60.0
>>   800x600        60.3     56.2
>>   848x480        60.0
>>   640x480        59.9
>
> The monitor is capable of 1280x1024, is it possible to override the
> max-resolution, if possible without touching xorg.conf.d?
> Both xrandr and kde's control center only let me select 1024x768 as
> maximal resolution :/

xrandr --newmode 1280x1024  109.00  1280 1368 1496 1712  1024 1027
1034 1063 -hsync +vsync
xrandr --addmode VGA1 1280x1024
xrandr --output VGA1 --mode 1280x1024

You may have to tweak the modeline or specify a reduced blanking mode
if your monitor is picky about the timing.  use cvt or cvt -r to
generate modelines.

Alex