xrandr complains that it cannot find the mode:

$ xrandr --output VGA-1 --mode 1280x720
xrandr: cannot find mode 1280x720

it only shows one possible mode (but in the older Ubuntu version I could chose multiple ones):

$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2047 x 2047
VGA-1 disconnected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
  1024x768 (0x13a)   75.0MHz
        h: width  1024 start 1048 end 1184 total 1328 skew    0 clock   56.5KHz
        v: height  768 start  771 end  777 total  806           clock   70.1Hz

and adding the mode fails:

$ xrandr --newmode "1280x720" 74.50 1280 1344 1472 1664 720 723 728 748 -hsync -vsync
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  23
  Current serial number in output stream:  23

I wonder what kind of applet you mean as the standard Ubuntu desktop settings do not allow mto change any resolution.


Gesendet: Donnerstag, 29. November 2012 um 15:21 Uhr
Von: "Xavier Bachelot" <[email protected]>
An: [email protected]
Betreff: Re: [Openchrome-users] Fwd: Ubuntu 12.04 and CN896 chipset only in 1024x768
On 11/29/2012 12:03 AM, [email protected] wrote:
> Nevertheless I can still not chose any other resolution than 1024x768.
> xrandr throws an error:
>
> $ xrandr --output VGA1 --mode 1280x720
> warning: output VGA1 not found; ignoring
>
> $ xrandr --newmode "1280x720" 74.50 1280 1344 1472 1664 720 723 728
> 748 -hsync +vsync
> X Error of failed request: BadName (named color or font does not exist)
> Major opcode of failed request: 149 (RANDR)
> Minor opcode of failed request: 16 (RRCreateMode)
> Serial number of failed request: 23
> Current serial number in output stream: 23
>
> is this a driver issue?

My fault, sorry. the randr call should have read :
xrandr --output VGA-1 --mode 1280x720

Use plain 'xrandr' to get a list of all supported modes.
'man xrandr' for more details.

Also, it might be easier to use some desktop applet rather than the
command line to use RandR.

Regards,
Xavier
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