Display brightness resets on wake...

Hello everyone. I am having an odd issue I cannot seem to troubleshoot. I have an LED Cinema Display connected to my 2009 aluminum MacBook (now they are called Macbook Pro's).
Seemingly at random, when I wake I will find the LED Display has reset it's brightness all the way to minimum. I cannot seem to pinpoint the issue as it is independent of any specific actions I am taking. I always close the lid on my macbook at night and open it in the morning. Some days the display is unaffected. Some days it resets. It is quite annoying.
Note, this is not the "backlight turned off" issue I've read about. It is simply adjusting the brightness to minimum.
Any ideas or solutions I am unaware of? Thanks for taking a moment to read my post.

I'm having a similar issue...
I have a LED Cinema Display connected to my 2009 MacBook Pro and sometimes when I wake it from sleep it 'forgets' which color profile it's using - it switches back to the default profile from the custom calibrated profile I set up.
I work around it by simply opening the Displays System Preference Pane and it suddenly 'remembers' that I'm using a calibrated profile.
Right now it's just an annoyance to open up the Displays Pane ever time this happens, but it'd be nice to have a real solution.

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Hi peart.
I am not kernel programmer, but I have analyzed the code of the ACPI video driver and the problematic patch. I have removed the check which sets the brightness to max but I can't compile because of not enough space to compile the kernel :S. Would you be so kind to compile the modified file and upload a compiled moduel to test.
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My modification is that I removed the check for BCQ object and removed the part where it sets the backlight to max. As far as I can see acpi_video_get_brightness(device->backlight) can be called without prior checking of BCQ object existance, because acpi_video_get_brightness then calls acpi_video_device_lcd_get_level_current which gets the current brightness level. acpi_video_device_lcd_get_level_current checks if BCQ object exists and handles it properly, as far as I can see.

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Hello mate,
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Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information on it.
ThinkPad T510 4313-CTO Windows 8 x64 - Intel Core i7-620M - NVIDIA NVS 3100M - 8GB RAM - 240GB SSD- Intel Centrino Ultimate-N 6300 - Gobi 2000.
ThinkPad Helix 3697-CTO Windows 8.1 x64 - Intel Core i7-3667U - Intel HD Graphics 4000 - 8GB RAM- 256GB SSD - Intel Centrino Advanced-N 6205 - Ericsson C5621gw

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Hello,
Automatic display brightness adjusting on my mid-2010 13" MacBook Pro somehow gets stuck. For example, when I work in bright room and put the computer to sleep (close the lid) the brightness level remains high when I wake the computer in darker ambience. The same happens in opposite direction, when the computer goes to sleep in darker room and wake in brighter, the screen brightness remains at low settings. Is there a way to reset the system to default brightness settings? I was satisfied with default behavior of automatic illumination and all these problems arise after I manually adjusted brightness using F1-F2 keys. Otherwise, illumination adjustments work when I cover the sensor. I can notice screen going darker or lighter when room lighting conditions change.
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Related post: http://forums.lenovo.com/t5/Windows-7-Discussion/Brightness-unadjustable-for-quot-High-Performance-q...
[Quote]
A link to the 3.09/3.10 version of BIOS is given below. Good luck. This is the version I used.
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70351
[End Quote]
T500 BIOS Update: http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70353
~ sierra42 ~
HP TC4400
Lenovo T500
-- I am not support, I'm just trying to help! --

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Hello Mike
Welcome to Discussions
If you are using a wired keyboard and some others you can use the F14 & F15 keys to adjust display brightness, try this it will save you time not having to open display preferences.
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Hello Gnazty,
Thanks for using Apple Support Communities.
I'd like you to reset your SMC and PRAM as the articles below describe:
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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Alex H.

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Quote from: zankou on 11-June-13, 23:02:54
Hi, I have recently bought GE60-0ND notebook with Win8 preinstalled which I got rid of in a second I got home, reinstalled with my licensed Win7. Half of things didn't work so I flashed the correct firmware. From that point on everything works perfectly, only brightness control is broken. I simply cannot control my monitor's brightness with my special keys nor in power control setup. So I googled.. and some smart guy recommended a bios flash as well. But when I try, it says either "Problem getting flash information" or "Problem getting bios information".
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Did you switch the BIOS and the EC Firmware to the Windows 7 counterparts?
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Screen resolution reset on wake up

screen resolution reset on wake up
I have a macbook Pro (13 inch, Mid 2010, Processor 2.4 GHz Intel Core 2 Duo, memory 4 GB 1067 MHz DDR3) running Yosemite OS X 10.10.2 (14C1514) connected to a high resolution display (2560x1440 BenQ BL2710) via a MDP2DVID adapter and a dual link DVI cable. Just sometimes (apparently randomly about once in 20 occasions) when I wake up the computer it turns both screens off for a second then turns them on again with the resolution reset to a low level on the built-in screen, and the external display is reduced to a small window in the centre. Sleeping and waking the computer usually brings it back to normal but with many of my open windows resized to a small level.
Does anyone know how this could be corrected?
Thanks
John Nixon

This happened again this morning. Here are the Apple System Log (ASL) Messages at the time:
2015-May-01 11:13:36 kernel[0]: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
2015-May-01 11:13:36 kernel[0]: RTC: PowerByCalendarDate setting ignored
2015-May-01 11:13:36 kernel[0]: RTC: PowerByCalendarDate setting ignored
2015-May-01 11:13:36 kernel[0]: Previous sleep cause: 5
2015-May-01 11:13:36 kernel[0]: The USB device Apple Internal Keyboard / Trackpad (Port 3 of Hub at 0x6000000) may have caused a wake by issuing a remote wakeup (2)
2015-May-01 11:13:36 kernel[0]: full wake promotion (reason 1) 108 ms
2015-May-01 11:13:36 watchdogd[213]: [watchdog_daemon] @(         pm_callback) - ref=0x0 msg_type=0xe0000320 msg=0x0
2015-May-01 11:13:36 kernel[0]: wlEvent: en1 en1 Link DOWN virtIf = 0
2015-May-01 11:13:36 kernel[0]: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
2015-May-01 11:13:36 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:36 kernel[0]: en1::IO80211Interface::postMessage bssid changed
2015-May-01 11:13:36 kernel[0]: en1: 802.11d country code set to 'X0'.
2015-May-01 11:13:36 kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
2015-May-01 11:13:36 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv4 listener multicast send failed en1, 50
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 50, fd 69, ErrLogCount 1 ResolverIntf:5
2015-May-01 11:13:36 sharingd[277]: 11:13:36.321 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 2 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 96, ErrLogCount 3 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 4 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 5 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 6 ResolverIntf:5
2015-May-01 11:13:36 configd[26]: setting hostname to "John-Nixons-MacBook-Pro.local"
2015-May-01 11:13:36 configd[26]: network changed: v4(en1-:192.168.1.123) DNS- Proxy-
2015-May-01 11:13:36 discoveryd[51]: Basic WABServer NetResolverEvent no resolvers, resetting domains
2015-May-01 11:13:36 UserEventAgent[16]: Captive: CNPluginHandler en1: Inactive
2015-May-01 11:13:36 discoveryd[51]: Basic Warn DD_Warn: Corrupt NSEC RDATA size
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:36 WindowServer[136]: handle_will_sleep_auth_and_shield_windows: NULL shield_window (lock state: 1)
2015-May-01 11:13:36 WindowServer[136]: CGXDisplayDidWakeNotification [346636855129711]: posting kCGSDisplayDidWake
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour Failed to delete registration recordId=119 error=4
2015-May-01 11:13:37 kernel[0]: en1: 802.11d country code set to 'GB'.
2015-May-01 11:13:37 kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:37 sharingd[277]: 11:13:37.246 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:37 sharingd[277]: 11:13:37.284 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 netbiosd[4354]: network_reachability_changed : network is not reachable, netbiosd is shutting down
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 kernel[0]: MacAuthEvent en1   Auth result for: 4c:09:d4:15:e8:39 MAC AUTH succeeded
2015-May-01 11:13:37 kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
2015-May-01 11:13:37 kernel[0]: AirPort: Link Up on en1
2015-May-01 11:13:37 kernel[0]: en1: BSSID changed to 4c:09:d4:15:e8:39
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 48,-1
2015-May-01 11:13:37 kernel[0]: en1::IO80211Interface::postMessage bssid changed
2015-May-01 11:13:37 kernel[0]: AirPort: RSN handshake complete on en1
2015-May-01 11:13:37 configd[26]: network changed: DNS* Proxy
2015-May-01 11:13:37 UserEventAgent[16]: Captive: [CNInfoNetworkActive:1709] en1: SSID 'BTHub4-H2J5' making interface primary (cache indicates network not captive)
2015-May-01 11:13:37 UserEventAgent[16]: Captive: CNPluginHandler en1: Evaluating
2015-May-01 11:13:37 UserEventAgent[16]: Captive: en1: Not probing 'BTHub4-H2J5' (cache indicates not captive)
2015-May-01 11:13:37 configd[26]: network changed: v4(en1!:192.168.1.123) DNS+ Proxy+ SMB
2015-May-01 11:13:37 UserEventAgent[16]: Captive: CNPluginHandler en1: Authenticated
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 kernel[0]: en1: BSSID changed to 4c:09:d4:15:e8:39
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 48,-1
2015-May-01 11:13:37 sharingd[277]: 11:13:37.880 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x42731c0
2015-May-01 11:13:38 WindowServer[136]: Found 18 modes for display 0x042731c0 [18, 0]
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x746050c5
2015-May-01 11:13:38 WindowServer[136]: Found 2 modes for display 0x746050c5 [2, 0]
2015-May-01 11:13:38 WindowServer[136]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
2015-May-01 11:13:38 WindowServer[136]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 1.65 seconds (server forcibly re-enabled them after 1.64 seconds)
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x42731c0
2015-May-01 11:13:38 WindowServer[136]: Found 18 modes for display 0x042731c0 [18, 0]
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x31000001
2015-May-01 11:13:38 WindowServer[136]: Found 2 modes for display 0x31000001 [2, 0]
2015-May-01 11:13:38 WindowServer[136]: Display 0x042731c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 18 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cc7, S/N 0, Unit 0, Rotation 0
UUID 0xcb5a19e16c20c98ebb2d70fc3bb550b4, ColorSpace { 1632878172 }
2015-May-01 11:13:38 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:38 WindowServer[136]: Display 0x31000001: GL mask 0x2; bounds (1280, 0)[640 x 480], 2 modes available
Active, on-line, enabled, OpenGL-accel, Vendor 3ac4, Model 0, S/N 0, Unit 1, Rotation 0
UUID 0x5a88aeaaae3bbb86e9aec154726397dd, ColorSpace { 1331579117 }
2015-May-01 11:13:38 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:38 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Adobe Reader" for synchronous notification type 100 (kCGSDisplayWillReconfigure) (CID 0x20243, PID 2268)
2015-May-01 11:13:38 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Console" for synchronous notification type 100 (kCGSDisplayWillReconfigure) (CID 0x16403, PID 262)
2015-May-01 11:13:39 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Notification Center" for synchronous notification type 109 (<unknown>) (CID 0x14d13, PID 361)
2015-May-01 11:13:39 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Activity Monitor" for synchronous notification type 109 (<unknown>) (CID 0xa26b, PID 261)
2015-May-01 11:13:39 WindowServer[136]: Display 0x042731c0: Unit 0: Mode 640 x 480, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80003006, ioModeDepth 0x2, IOReturn 0x0
2015-May-01 11:13:39 WindowServer[136]: hw_mirror_device_if_possible: driver picks 0x31000001 as primary
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display mode changed
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display added
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display removed
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Displays mirrored
2015-May-01 11:13:39 WindowServer[136]: Display 0x31000001: GL mask 0x2; bounds (0, 0)[640 x 480], 2 modes available
Master in mirror set; Main, Active, on-line, enabled, OpenGL-accel, Vendor 3ac4, Model 0, S/N 0, Unit 1, Rotation 0
UUID 0x5a88aeaaae3bbb86e9aec154726397dd, ColorSpace { 1331579117 }
2015-May-01 11:13:39 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:39 WindowServer[136]: Display 0x042731c0: GL mask 0x1; bounds (0, 0)[640 x 480], 18 modes available
Hardware mirror of 0x31000001; on-line, enabled, built-in, boot, Vendor 610, Model 9cc7, S/N 0, Unit 0, Rotation 0
UUID 0xcb5a19e16c20c98ebb2d70fc3bb550b4, ColorSpace { 1632878172 }
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: notification observer: com.apple.iChat   notification: __CFNotification 0x7f960b4aaee0 {name = _NSDoNotDisturbDisabledNotification}
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>:    NC Disabled: NO
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>:   DND Enabled: NO
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: Updating enabled: YES   (Topics: (
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:41 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: notification observer: com.apple.iChat   notification: __CFNotification 0x7f960b44dd70 {name = _NSDoNotDisturbEnabledNotification}

Automatically adjust display brightness via Terminal / Pretty good solution

This hint is for all of you who experience any problem with the adjustment of the display brightness.
*Short version*
After a cold and/or warm start, it sometimes happens that the brightness was changed by the system itself to its dim power saver setting or maximum value and sometimes - what a big surprise - remains as it has been configured.
I had spotted plenty of articles about this phenomenon, but none of them yielded a solution. I then decided to solve this problem by going the pragmatically way and use some kind of software which dims the display to my preferred setting. And the winner is: brightness.
This tiny program works perfect and you will love its benefit by using it in terminal - yes, brightness is a command line utility. On top of this, brightness is able to control different displays, internal and external. The clou: beside using the precompiled binary you can also download the source code here, modify it to make the program fit your needs and then compile it using Xcode.
1. Installation
Download a precompiled version of the command line utility brightness here and extract the binary to your desired path (e.g. /usr/bin).
2. Usage
"brightness -l -v" dumps the current display attributes (-v for verbose mode) while "brightness 0.5" modifies the brightness of the main display to half of its max value and "brightness -m 1 1" let a second display become shiny. Just play little bit around.
3. Automatically launch
Simply create a .plist file and drop it, for example, in ~/Library/LaunchAgents. Or make use of an AppleScript or a Terminal Script to let it launch.
That's it. Comments are welcome.
*Long version*
It seems to be, that the adjustment of the display brightness of an iMac and MacBook/Pro (maybe also other models are affected) drives a life of its own. After a cold and/or warm start, it sometimes happens that the brightness was changed by the system itself to its dim power saver setting or maximum value and sometimes - what a big surprise - remains as it has been configured.
I had spotted plenty of articles about this phenomenon, but only found terms like "Did you already disabled the ambient light sensor", "Did you already reset the PRAM?", "Did you already reset the NVRAM?", "Did you already…BLAH". Far from it, all of these tips have one thing in common: none of them yielded a solution. As a last resort, I thought, it was a good idea to install 10.6 from the scratch just to find out that the above mentioned phenomenon occurs right after a few days of using OS X.
I then decided to solve this problem by going the pragmatically way and use some kind of software which dims the display to my preferred setting. There are a few applications to do this, but always it was necessary to drag a slider or type in a value to dim the display, so none of them allowed an automatic configuration. No, I am not a very sophisticated person, I only prefer to use software which is simply well-thought-out. And the winner is: brightness.
This tiny program works perfect and you will love its benefit by using it in terminal - yes, brightness is a command line utility. On top of this, brightness is able to control different displays, internal and external. The clou: beside using the precompiled binary you can also download the source code here, modify it to make the program fit your needs and then compile it using Xcode.
1. Installation
Download a precompiled version of the command line utility brightness here and extract the binary to your desired path (e.g. /usr/bin).
2. Usage
"brightness -l -v" dumps the current display attributes (-v for verbose mode) while "brightness 0.5" modifies the brightness of the main display to half of its max value and "brightness -m 1 1" let a second display become shiny. Just play little bit around.
3. Automatically launch
Sure, OS X provides different ways to launch a program automatically. If you are an enthusiast, feel free to use the one you prefer and stop reading, because you are already finished. If you are not that familiar to OS X take the next step as an advice.
An easy way to trigger OS X launching a program automatically is to add the desired program to your Login Items. But, in this case, it will not work the easy way, because we have to launch a so called classic command line utility with a given option. It is not like starting Mail or iCal, which appears as typical applications to OS X. You must start brightness via Terminal by typing "brightness 0.5" (without quotes) to modify the main display brightness to half of its max.
We now use a Launch Agent. Just create a .plist file, e.g. com.brightness.plist, with your favorite text editor. For the lazy ones here comes the template (simply copy and paste):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Disabled</key>
<false/>
<key>Label</key>
<string>com.brightness</string>
<key>ProgramArguments</key>
<array>
<string>/usr/bin/brightness</string>
<string>.5</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
Save the file in ~/Library/LaunchAgents, if you want brightness to be executed everytime you log in.
You could also use an AppleScript. Copy and paste this code "do shell script "brightness 0.5"" (without the leading and closing quotes) to a new Script. Then choose Save As and enable the Option to make it Execute only. Now add the Script to your Login Items.
Another option is to use a Terminal Script. Copy and paste this code
#!/bin/bash
/usr/bin/brightness 0.5
exit 0
and save it as, for example, brightness.sh. Make the Script executeable and add it to your Login Items.
That's it. Comments are welcome.

Thanks. Works great. I made a ScriptBundle and a User Agent (launchd) . So if someone sets the display brightness to maximum, it automaticaly corrects it at next login.
The ScriptBundle contains your mentoined command line utility and the following applescript:
do shell script quoted form of (POSIX path of (path to resource "brightness")) & " 0.7"
Be aware of the space in " 0.7" or whatever value you have set.

External Monitor in Target Display Mode Won't Wake Up

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Same issue here, I'm using a macbook pro retina and connecting to a 27 inch imac via thunderbolt and target display mode.
I also have a 27 inch thunderbolt display hooked up via tbolt cable as well.
Whenever the displays goto sleep, the iMac does not wake up with the other screens. My setup knows the iMac is part of the displays, it doesn't act like there are only 2 screens available.
If I press the target display mode shortcut (command + f2) then the imac screen turns on, but now its left target display mode (so it clearly is in target display mode, but does not receive the command to turn on display or ignores it). Hitting hte shortcut again now switches back.
I have not tried just the mbpr + imac as target display mode, but based on your post it still wouldn't wake up if it was the only machine connected.
I've found that when I come back to my computer, i just hit command +f2 on the imac, which wakes it up and jumps to its screen, t hen i hit command +f2 again, and now I wake the mbpr from sleep so it doesn't have to go from 2 screens to 3 screens.

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I just bought a macbook pro in June and the display brightness keys are not working, nor is there a scale I can find in the system preferences to adjust the lighting level across the screen. Why is that and how do I fix it?

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Dimming Display Brightness to Zero

Hello All,
I have been having a problem with the display brightness adjustment for a long time. Basically, the display of my 17" 1GHz G4 cannot be dimmed to black. From the System Preferences the display brightness can be lowered with the slider. In the final third however dragging the slider further to the left not only does not reduce the brightness it actually slightly increase it, and the display start to flicker.
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That model doesn't support dimming the display brightness to zero, except through Energy Saver (which may not work with all third party USB devices), or a screen saver that has a picture that shows nothing but black. Some third party hacks dim the display, but they are not necessarily that reliable.
Only Apple's notebook displays dim to full black.

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Hi, i am using latest B2G 2.2 [2014-10-08, flame phone]
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Every time i update firmware, i set this value to 10%.
i think this value is too high, it consume more battery.

Hi, my point is default value is too high,
it affect battery life.
user some time forget set this value,
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