lubuntu-rc.xml -shortcuts

[farinet at arcor.de]

I don't know if it's correct to ask here my questions. If not, sorry in
advance ...

Anyway, i'm encountering several problems with the predefined shortcuts
in the - default! - ~/.config/openbox/lubuntu-rc.xml shortcuts (lubuntu
13.10):

1.
<CTRL><F10> and <CTRL><F11> do not work (xbacklight is missing). My
question is: Why xbacklight is not installed by default if this commands
presume its presence? I installed it, dimming and increasing now works
but there seem to be a problem with 'xbacklight -inc 20'. At maximum
brightness the screen becomes dead (that's not a lubuntu problem, sure ;) ).

2.
The screenshot related command <PRINT> has no effect. I looked into it
and executed the command 'lxsession-default screenshot' from the
commandline. There, i'm getting the error msg:

/usr/bin/lxsession-default: 53: [: missing ]
/usr/bin/lxsession-default: 57: [: missing ]

I looked into that file and line 53 says:

elif [ "$1" = "screenshot" && "$2" = "window"]

And line 57:

elif [ "$1" = "screenshot"]

Now, im not into scripting but i presume many out here are. I checked if
scrot is installed and it is. So, what could miss there?

3.
Sound control (XF86Mute, XF86RaiseVolume, XF86LOwerVolume) do not work
at all. Executing the XF86Mute related command, i got this:

~$ amixer set Master toggle
amixer: Unable to find simple control 'Master',0

Then i tried:

~$ amixer scontrols
Simple mixer control 'IEC958',0

And therefore i tried to substitute 'Master' by 'IEC958':

~$ amixer set IEC958 toggle
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

[Effectively, in the terminal the command toggles between [on] and
[off], but that did not have any effect on the sound output of the
machine. But,may be there is a problem with/between alsa and pulse.
Unfortunately pulse audio has a lot of dependencies so trying to
uninstall it uninstalls a lot of useful (and necessary) programs like
Blueman for instance too.

Thanks a lot in advance for your patience.