iMac24: how to reduce backlight intensity (brightness)

[hartrock]

Dear All,

 

the backlight of my brandnew iMac24'' is much too bright:

and this is at lowest brightness and contrast settings (at least working at night ;-) ).

 

My settings:

$ ioreg -l | grep rightness
   | | |   "ApplePanelRawBrightness" = 0
   | |       "IODisplayParameters" = {"brightness"={"min"=0,"max"=128},"commit"={"reg"=0}}
   | |   |     |   |       "IODisplayParameters" = {"brightness"={"min"=0,"max"=128,"value"=0},"commit"={"reg"=0},"thrm"={"min"=0,"max"=0,"value"=0}}

 

Could it help to change the value of "ApplePanelRawBrightness" = 0'?

And if so: where to change it?

 

 

Before I have tried (trial'n'error approach, note: this is my first Mac) a change in /System/Library/Extensions/AppleBacklight.kext/Contents/Info.plist:

from

                       <key>IODisplayParameters</key>
                       <dict>
                               <key>brightness</key>
                               <dict>
                                       <key>max</key>
                                       <integer>255</integer>
                                       <key>min</key>
===>                               <integer>40</integer>
                               </dict>
                               <key>commit</key>
                               <dict>
                                       <key>reg</key>
                                       <integer>0</integer>
                               </dict>
                       </dict>

to

                       <key>IODisplayParameters</key>
                       <dict>
                               <key>brightness</key>
                               <dict>
                                       <key>max</key>
                                       <integer>255</integer>
                                       <key>min</key>
===>                               <integer>0</integer>
                               </dict>
                               <key>commit</key>
                               <dict>
                                       <key>reg</key>
                                       <integer>0</integer>
                               </dict>
                       </dict>

 

, followed by deleting Extensions.kextcache and Extensions.mkext and a reboot.

This has not helped (the idea has been that the min val could limit decreasing the brightness somehow).

 

 

Any hints?

[mifki]

lol n00b.

 

press F14 on you're fancy new apple keyboard

[hartrock]

lol n00b.

 

press F14 on you're fancy new apple keyboard

 

 

I wrote: '... and this is at lowest brightness and contrast settings ...', so this does not help.

 

Furthermore I know tools like e.g. 'Gamma Control' and 'Black Light', but they don't reduce the backlight intensity. Calibrating with SuperCal (btw: a very nice tool!) included saying from the user, when some very dark rgb colored region is not seen anymore while reducing brightness with a controlling slider. For me it diminishes just at or very near at the minimum for all colors...

 

A local Apple support said (after phoning with the country-wide one), that for their demo machine it's also not possible to reduce the backlight very much (via brightness control). But I think that should be possible via software (and would be the most elegant solution)...

 

If another forum here is better suited for this problem, I would be thankful for a hint.