Bug#544518: A way for --prop to not take half a second

[Julien Cristau <jcristau@debian.org>]

On Mon, Aug 31, 2009 at 19:53:36 +0200, Wouter Verhelst wrote:

> Package: x11-xserver-utils
> Version: 7.4+2
> Severity: wishlist
> File: /usr/bin/xrandr
> 
> Hi,
> 
> wouter@celtic:~$ time xrandr --prop
> [...xrandr output snipped...]
> real	0m0.444s
> user	0m0.004s
> sys	0m0.008s
> 
> I currently have a shell script that does the following:
> 
>   BL=$(xrandr --prop|awk '/BACKLIGHT:/{print $2}')
> 
> with the intention of then being able to use that to compute stuff and
> set the new value, and hook that to the XF86MonBrightnessDown and ...Up
> keys as a hotkey.
> 
> However, due to the fact that xrandr spends almost half a second waiting
> on the X server for information that I don't need, and combined with the
> fact that I don't see any way for me to change the set of data that
> xrandr requests from the X server, this script is nearly unusable.
> 
> There could be alternate solutions to this wishlist item; e.g., it would
> help if I would be able to tell xrandr that the X server has to increase
> the value of a property relative to its current value with a value
> relative to its valid range, or some such (say, a command similar to
> 'increase the value of the BACKLIGHT property on the LVDS output by 10%
> of the total range).
> 
Try xrandr --current --prop?

Cheers,
Julien