confused by xrandr man page example

[Thomas Lübking]

Am Wed, 10 May 2017 04:38:33 -0400
schrieb Felix Miata <mrmazda at earthlink.net>:

> It seems obvious why x is 1600, but y=0 seems inconsistent with the
> specification of x. Are 0 and 768 equally correct for y=768?

Also in that manpage ;-)
> --panning
> [...]
> A  width  or  height  set to zero disables panning on the
> according axis."

> 	--panning 1600x384

Doesn't work for me, 
> X Error of failed request:  BadMatch (invalid parameter attributes)
>  Major opcode of failed request:  140 (RANDR)
>  Minor opcode of failed request:  29 (RRSetPanning)
>  Serial number of failed request:  31
>  Current serial number in output stream:  31

Cheers,
Thomas