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Snow Leopard changed the brightness range of MBP 13" ?

19476 Views 112 Replies Latest reply: Nov 19, 2009 1:12 PM by Iggy65 RSS
  • uriaha Calculating status...
    NiCOOo wrote:
    Well, not sure my english is good enough, but I have at home my MacBook Pro 13" (9CC2) and my brother's one (9CC2 too).

    Both laptop are set a the same visual level of brightness: the Snow leopard one (my own MBP) is a level 1, but my brother's one is set at level 8 (but both show same brightness).

    When both are set to level 1, my brother's one is really (really!) less bright (but less power eater).

    Any chance you could post a picture of your brother's MBP and yours, side-by-side, both at brightness level 1?
    13" MacBook Pro, Mac OS X (10.6)
  • direwolf8 Level 4 Level 4 (1,280 points)
    Besides being very subjective, that could be a normal variance in the LCD panels. I have two identical Dell 22" LD monitors side by side, from the same manufacturing run and their appearance isn't nearly the same with identical settings (and I can't get them to be identical no matter how they're set).
    G5, Mac OS X (10.5)
  • Calculating status...
    It's obviously a bug in the AppleBacklight.kext kernel extension of Snow Leopard.

    When you replace /System/Library/Extensions/AppleBacklight.kext (Snow Leopard version 170.0.2) with the version 1.6.0 from Leopard 10.5.8, after a reboot you have again the brightness levels on your MacBook Pro 13" known from Leopard.

    I've opened a bug report at Apple, problem ID 7195636 - I don't know if Apple engineers read this discussions...

    BTW, when you want to automate the brightness adjustment of your MacBook Pro in conjunction with a LED Cinema Display, maybe my BrightnessSync preference pane helps. It's still beta, but it works fine with Snow Leopard. See => BrightnessSync.
    MacBook Pro 13", Mac OS X (10.6)
  • Pandaholic Calculating status...
    NiCOOo: I just had a clean install of Snow Leopard on my MacBook Pro 13", and I have the exact same problem. It doesn't really bother me that much because I keep my screen brighter, but I do think this isn't a case specific issue and seen that it has affect a lot of people.
    Mac OS X (10.6)
  • uriaha Level 1 Level 1 (0 points)
    I had some extra time today, so I set my MBP to dual-boot Leopard and Snow Leopard. I then compared screen brightness in 10.5 to 10.6 at low, medium, and high brightness, as adjusted by the function keys. Exposure and white balance were set manually and held constant across images. As others have suggested, the minimum brightness on Snow Leopard is roughly equal to the mid-point on Leopard. We weren't crazy!

    You can see the results here:

    Message was edited by: uriaha
    13" MacBook Pro, Mac OS X (10.6)
  • Pandaholic Level 1 Level 1 (0 points)
    How do I tell if its a 9cc2 panel?
    Mac OS X (10.6)
  • uriaha Level 1 Level 1 (0 points)
    Yep, 9CC2 panel for me.
    13" MacBook Pro, Mac OS X (10.6)
  • Pandaholic Level 1 Level 1 (0 points)
    Ya, mine is a 9CC2.
    Mac OS X (10.6)
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