No 1680x1050 for external monitor

[Dotan Cohen]

On Sat, Jun 2, 2012 at 1:05 AM, Dotan Cohen <dotancohen at gmail.com> wrote:
> I just installed Kubuntu 12.04 on a neighbour's laptop computer with
> Intel graphics. He uses the computer with an external monitor attached
> as the laptop's builtin monitor is faulty and useless. Both the laptop
> internal monitor and the external monitor are of the same resolution:
> 1680x1050.
>
> When configuring the resolutions with the KDE graphical tool, there is
> an option for 1680x1050 for the laptop monitor, but for the external
> monitor the options only go up to about 1200x768. When connecting this
> monitor to my desktop to test (Kubuntu 11.10) the desktop sends it
> 1680x1050 with no problems. So why won't the Kubuntu 12.04 laptop send
> it that resolution? How can I fix this?
>
> Thanks.
>

I just tried with another 1680x1050 external monitor, and got the same
result. I didn't mention it, but this used to me my own laptop
computer, and when it was mine it worked fine with this second
monitor. That was 2007-2010, so either something went bad in the
laptop or something went bad in recent Kubuntus!

I was able to resolve the issue with xrandr:
$ cvt 1680 1050
# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053
1059 1089 -hsync +vsync
$ cat .xprofile
xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050
1053 1059 1089 -hsync +vsync
xrandr --addmode VGA-0 1680x1050_60.00
xrandr --output VGA-0 --mode 1680x1050_60.00


-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com