Dimmer screen

Discussion in 'iMac' started by wesleyh, Nov 6, 2008.

  1. wesleyh macrumors 6502

    Mar 23, 2007
    I have an imac G5, after I wake it from sleep, the screen appears at normal brightness, but half a second later, the screen is half the brightness.

    Note that the brightness is still at 100% (pressing F15).

    Now, sometimes when my screen is dim, I can get it back to full brightness by going to sleep and waking it up again, but it all seems very finicky.

    Does anyone know what this issue is? Seems like software to me.

  2. joelw135 macrumors 6502


    Oct 15, 2008
    New Jersey, USA
    I am not sure, but I was told that there might be an ambient light sensor in the system. Maybe someone can help you out with a yes or a no.
  3. djc6 macrumors 6502a

    Aug 11, 2007
    Cleveland, OH
    What happens when you boot off the OS X installation media for your iMac? Does it stay at full brightness?
  4. pwn247 macrumors 6502


    Aug 30, 2008
    West Virginia, USA
    I doubt it's software related. Try plugging it into a different wall socket?
  5. wesleyh thread starter macrumors 6502

    Mar 23, 2007
    Never does it just happen during normal usage, only after putting it to sleep.
    (or possibly screensaver as well, dunno). Sometimes it doesn't happen at all, so it's inconsistent.

    I tried booting from CD and had no problems there.

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