Comment # 10 on bug 971885 from Egbert Eich

(In reply to Felix Miata from comment #9)
> 
> # xrandr -q
> 
> Screen 0: minimum 8 x 8, current 1440 x 900, maximum 32767 x 32767
> DP1 disconnected (normal left inverted right x axis y axis)                 
> 
> HDMI1 disconnected (normal left inverted right x axis y axis)               
> 
> VGA1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 474mm
> x 296mm                                   
>    1680x1050     59.97 +  74.89
>    1600x1000     60.01
>    1280x1024     75.02    72.05    60.02
>    1440x900      74.98    59.89*   59.98
>    1152x864      75.00
>    1024x768      75.08    70.07    60.00
>    800x600       72.19    75.00    60.32
>    640x480       75.00    72.81    66.67    60.00
>    720x400       70.08
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Ok, what happens if you do a
   xrandr --dpi 108 --output VGA1 --mode 1680x1050
right after doing the 'xrandr -q' on the same machine? Does the mode change to
1680x1050 - or do you get an error message?
Please also do what I've asked for in comment #3 on this machine. (The proposal
in comment #3 was not meant as a workaround but as a debugging aid).