11-05-2021

Dmg Backlight Can't Close Shell


Adjust brightness from Terminal | 18 comments | Create New Account

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For the uninitiated such as myself, PowerPC and 64Bit binaries, along with their installation location, would be useful. Thanks.

I'm the original author of the code listed in this hint. I originally wrote it for two reasons: first, to adjust brightness automatically by location on my iBook G4, which had no ambient light sensor, and second, so I could have my laptop turn on the backlight when a long operation finished, providing a quiet form of notification I could use while at a seminar.

http://sabi.net/nriley/software/brightness.zip is 4-way universal, 10.5+. I compiled it under 10.6 with: (note that if you compile it with the 10.6 SDK you'll get a deprecation warning; it's harmless for now.)

Thanks for this!
Just copied it to /usr/local/bin on my iBook G4 and it works great.

Does this work on Mountain Lion? I've just downloaded it, unzipped and run it and get the following: Mountain Lion 10.8.2 on a MacBook Pro

You'll need to recompile it to work on Mountain Lion, but it's really easy. First, grab the source from http://dev.sabi.net/svn/dev/trunk/LocationDo/brightness.c and save it somewhere on your computer. Pop open terminal and run the following command from the same directory as brightness.c:

gcc -std=c99 -o brightness brightness.c -framework IOKit -framework ApplicationServices

You must have XCode installed to run this, and it worked like a charm for me. Move to /usr/local/bin and make sure it has the correct permissions. Hope this is helpful.

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I guarantee that 64-bit won't gain you anything at all in this case over 32-bit running on Intel. This is such a small and simple application that there's no benefit whatsoever to going beyond 32-bit, even on a system running all 64-bit stuff otherwise. Well, maybe a tiny psychological advantage for those who absolutely can't stand to have their system 'polluted' by 32-bit stuff, but certainly no real-world advantage. ;)

That said, many thanks to the original author and to the hint submitter for calling attention to it! This program gives me a great idea to simulate an intermittent screen problem in my custom anti-theft script for my MacBook. Can't wait to try it out.

Absolutely brilliant! Thankyou!

There are instructions to compile this on the linked page.
The only problem I found is that it only dims the screen of the main display, not a second display hooked to a laptop.

The original brightness.c had a -d (display) option. I've been using this program for about 1/2 a year now and it works very nicely. The usage is something like:

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This only works on my aluminum macbook, and iMac, it does not work on my mac pro with 30' ACD.

Yeah, unfortunately Apple doesn't have a documented way of controlling brightness over USB. The documented method only works with built-in and ADC displays.
Use the version I linked above (http://sabi.net/nriley/software/brightness.zip) instead; it uses the same method as the Displays preference pane does.

-=*Brilliant*=-
THANK YOU!

Likewise, I've been searching high and low for a pure command line (the scripts for System Prefs is too slow). Thanks!

Dmg backlight canThis is the only way I could find to program brightness up/down into my Microsoft Ergonomic 4000 keyboard. I was able to write an application to do brightness up (and a separate app for brightness down)

Here's how to make the mac brightness-up app:

Save the brightness file to Macintosh HD/Library
Open AppleScript and enter this code
do shell script '/Library/brightness -l'
set lev to result's last word
set lev to lev + 0.05
do shell script '/Library/brightness ' & lev

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Go to File > Save As... (remember to select 'Application' from the File format selection)

Then I set a programmable key on my keyboard to run this application I just saved.
Repeat process with a '- 0.05' in the script to make a brightness down app.

Hey to all!
Could you possibly help me with a script?
I have a problem in string 'set lev to lev + 0.05':
AppleScript interpretator can't convert lev to number.

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You'll need to download the 'brightness' file (link given in this original hint) and have the file path in the first and last line point to it.
Come to think of it, I actually downloaded the brightness file to my user's Library folder (It's a bit easier to get to using Finder)
So here's my BrightnessDown.scpt for example:
do shell script '/Users/Myname/Library/brightness -l'
set lev to result's last word
set lev to lev - 0.05
do shell script '/Users/Myname/Library/brightness ' & lev
As a troubleshooting step, open terminal and enter in the commands as a test.
When I enter this in terminal:
/Users/Myname/Library/brightness -l
I get this: (which tells me I have the script downloaded and the command right)
display 0: main display, ID 0x42735c0
display 0: brightness 0.468750

Great tip, I've been looking for something like this for a long time.
Now to get it to do it based on power source, i.e
Battery = 0.5
Ac = 1

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Hey, based on this great tool, this blog (http://www.mikerapin.com/blog/?p=73) and some forums I made an Applescript that stores the current brightness in a hidden file, set it to 0 and back if executed again. All without slow, nasty GUI scripting. So you can use it with Spark or something as shortcut! Here it is:
-- adjust path to User Directory, file will be hidden
set logfilepath to ('/Users/???/.brightness--.txt' as Unicode text)
-- does the log file already exist?
try
set logfilealias to logfilepath as alias
set logfileexists to true
on error
set logfileexists to false
end try
try
set AppleScript's text item delimiters to 'brightness '
do shell script '/bin/brightness -l'
-- get first number after word 'brightness' so its safe if multiple displays
set brightness to (words 1 thru 1 of (text item 2 of result)) as real
end try
if brightness as number is greater than 0 then
try
do shell script '/bin/brightness 0'
writeTo(logfilepath, brightness, text, false)
end try
else
try
set brightness to readFile(logfilepath)
do shell script '/bin/brightness ' & text of brightness
writeTo(logfilepath, '0', text, false)
end try
end if
on writeTo(targetFile, theData, dataType, apendData)
-- targetFile is the path to the file you want to write
-- theData is the data you want in the file.
-- dataType is the data type of theData and it can be text, list, record etc.
-- apendData is true to append theData to the end of the current contents of the file or false to overwrite it
try
set targetFile to targetFile as string
set openFile to open for access targetFile with write permission
if apendData is false then set eof of openFile to 0
write theData to openFile starting at eof as dataType
close access openFile
return true
on error
try
close access file targetFile
end try
return false
end try
end writeTo
on readFile(unixPath)
set foo to (open for access (POSIX file unixPath))
set txt to (read foo for (get eof foo))
close access foo
return txt
end readFile