Регулировка подсветки дисплея HP Probook 4515s [SOLVED]

решил установкой xbindkeys.
.xbindkeysrc

"sudo /usr/local/bin/adjustBrightless.pl up"
  XF86MonBrightnessUp
"sudo /usr/local/bin/adjustBrightless.pl down"
  XF86MonBrightnessDown

скрипт djustBrightless.pl

#!/usr/bin/perl -w                                            
#===============================================================================
#   adjustBrightness.pl                                                         
#===============================================================================
my $file = "/proc/acpi/video/EGFX/LCD/brightness";                              

unless (scalar(@ARGV) == 1 and ($ARGV[0] eq "up" or $ARGV[0] eq "down"))
{                                                                       
  die("You must specify 'up' or 'down'.\n");                            
}
my $direction = shift();

my $setting = "";
my @levels = ();
open(B, $file) or die("Error opening '$file': $!\n");
while (<B>)
{
  if (m#^current: (\d+)$#)
  {
    $setting = $1;
  }
}
close(B);
chomp($setting);

if ($direction eq "up")
{
  $setting+=10;
}
elsif ($direction eq "down")
{
  $setting-=10;
}
exit(0) if ($setting < 10 or $setting > 100);
open(B, ">$file") or die("Error opening '$file': $!\n");
print(B "$setting\n");
close(B);

(c) Mr. Sinister отсюда - http://ubuntuforums.org/showthread.php?t=331514
я исправил соответственно под себя.