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reset SMC but Screen Brightness Keys still don't work

1170 Views 8 Replies Latest reply: Jul 28, 2013 9:46 PM by hotwheels 22 RSS
hotwheels 22 Level 1 Level 1 (0 points)
Currently Being Moderated
Jul 27, 2013 9:22 AM

hi all.

 

i noticed after squinting at the screen all day yesterday that my screen brightness keys F1 and F2 on my mac pro keyboard are not working.

 

first thing i did was look in the UI for some kind of manual setting like for the Sound and i was not able to find one so the screen is still a bit dark for my needs.

 

then i /unchecked/ the "Use Function Keys as..." box in the Settings in case something was screwed up or changed there.

 

then i reset the SMC controller which i basically did by default (as i understand it) by shutting down the computer and unplugging it overnight during a thunderstorm.

 

now i am back at trying to solve this and i am wondering if i should reset the PRAM which i guess i will do but i don't want to have to bother with resetting all the settings on this if i don't have to.

 

any ideas on what may be going on? i have a 23" cinema display and a Mac Pro 1,1.

 

THANKS

 

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MacBook Pro, OS X Mountain Lion (10.8.1)
  • The hatter Level 9 Level 9 (58,535 points)

    Direct you to the proper forum for MacBook :


    MacBook Series Forums
    https://discussions.apple.com/community/notebooks?view=discussions

    Mac OS X Forum
    https://discussions.apple.com/community/mac_os?view=discussions

     

    Resetting the System Management Controller (SMC)

    Summary

    In some situations, you may need to reset your computer's SMC.  Learn how to identify these conditions and reset the SMC.

    Products Affected

    Desktop Computers, Portable Computers

    Note: It is possible that the SMC could encounter an issue that may cause unusual system behavior typically related to the symptoms described below. In some cases, resetting the SMC may be the only correct method to resolve the issue, however, an SMC reset should only be attempted after all other standard troubleshooting has been performed.

    Before Resetting the SMC

    Try each of the following steps in this order before you reset the SMC.  Test the issue after completing each troubleshooting step to determine if the issue still occurs.

    1. Press Command + Option + Escape to force quit any application that is not responding.
    2. Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
    3. Restart your Mac by by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
    4. Shut down your Mac by by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
      If your Mac appears to be running normally but isn't responding, force the computer to shut down by pressing and holding the power button for 10 seconds. Note: You will lose any unsaved work in any open applications. 

    For Mac portables experiencing issues related to the MagSafe power adapter and/or battery, try:

    1. Unplug the MagSafe power adapter from the Mac and the wall power socket for several seconds.
    2. Shutdown the Mac. Physically remove and re-insert the battery (if it's removable) and startup the Mac.
      If the issue is still not resolved after following the troubleshooting items above, an SMC reset may be necessary. 

    After performing normal troubleshooting, these symptoms may indicate that an SMC reset may be necessary:

    Fans
    The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.

    Lights
    The keyboard backlight appears to behave incorrectly (on Mac computers that have this feature).
    The Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have an SIL).
    Battery indicator lights, if present, appear to behave incorrectly (on portables that use non-removable batteries).
    The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.

    Power
    The computer doesn't respond to the power button when pressed.
    A portable Mac doesn't appear to respond properly when you close or open the lid.
    The computer sleeps or shuts down unexpectedly.
    The battery does not appear to be charging properly.
    The MagSafe power adaptor LED doesn't appear to indicate the correct activity.

    System Performance
    The computer is running unusually slowly although it is not experiencing abnormally high CPU utilization.

    Video
    A computer that supports target display mode does not switch into or out of target display mode as expected.
    A computer that supports target display mode switches into or out of target display mode at unexpected times.

     

    Resetting the System Management Controller (SMC)

    Resetting the SMC on Mac portables with a battery you can remove

    Resetting the SMC on portables with a battery you should not remove on your own

    Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

    Additional Information

    The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs. These functions include:

    • Responding to presses of the power button
    • Responding to display lid opening and closing on portable Macs
    • Battery management
    • Thermal management
    • The SMS (Sudden Motion Sensor)
    • Ambient light sensing
    • Keyboard backlighting
    • Status Indicator Light (SIL) management
    • Battery status indicator lights
    • Selecting an external (instead of internal) video source for some iMac displays

    Mac Pro, Mac OS X (10.7.5), ATI 5770 16GB Samsung SSD Sonnet 6G
  • DieselFuelForLife Level 2 Level 2 (370 points)

    SMC does not control the keyboard or screen brightness.

     

    • Responding to presses of the power button
    • Responding to the display lid opening and closing on portable Macs
    • Battery management
    • Thermal management
    • The SMS (Sudden Motion Sensor)
    • Ambient light sensing
    • Keyboard backlighting
    • Status Indicator Light (SIL) management
    • Battery status indicator lights
    • Selecting an external (instead of internal) video source for  some iMac displays

     

    Make sure in the Keyboard panel, "Use all F keys as standard keys" is not checked and that all modifier keys are set correctly.

  • Courcoul Level 6 Level 6 (11,135 points)

    Settings like the brightness are stored in the PRAM, so they carry over thru restarts. So yeah, a PRAM reset should help.

     

    Maybe the switching between OS X and WinXP caused the PRAM contents to become corrupted. The fact that Apple no longer supports XP in BootCamp (which includes providing adequate device drivers) doesn't help.

  • Courcoul Level 6 Level 6 (11,135 points)

    Ok, Win 7 / BootCamp. So I have to ask. When you did the partitioning and install with BootCamp Assistant, did you download and install the Apple device drivers as well?

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