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J D Knight III
Level 4 (3,415 points)

Q: Apple Studio Display LCD brightness control software

I have an old Apple Studio Display LCD with the ADC connector. When last using it connected to the OEM display card you simply push the brighness button on the display and the brightness control would open up in the Display Control Pannel. Last use I dimmed the display.

 

Now it is hooked up to a PM G4 running 10.4.6, with a upgraded display card, via DVI out using an Apple DVI to ADC adaptor. The brightness button lights up but does not launch the control panel. Also there is NO brightness control in the control pannels.

 

Any ideas? I traded the OEM video card so that cannot be put back into the system.

PowerMac, Mac OS X (10.5.8), G4 AGP

Posted on Aug 31, 2011 3:04 PM

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J D Knight III

Q: Apple Studio Display LCD brightness control software

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  • by JeanLuc7,

    JeanLuc7 JeanLuc7 Sep 2, 2011 6:12 AM in response to J D Knight III
    Level 1 (5 points)
    Sep 2, 2011 6:12 AM in response to J D Knight III

    Just plug in the USB connector from the ADC adaptor, and the control will return. The brightness control is implemented as an USB device.

  • by J D Knight III,

    J D Knight III J D Knight III Sep 2, 2011 7:13 AM in response to JeanLuc7
    Level 4 (3,415 points)
    Sep 2, 2011 7:13 AM in response to JeanLuc7

    I wish it was that simple.

     

    The USB from the Apple DVI to ADC adaptor is plugged in, and the mouse and keyboard work off of the display.

    It doesn't matter if I plug it into a USB1/2 port.. still not working.

     

    It seems that it is known, but seen as not connected even though it is online:

     

    ATI Radeon 8500:

     

      Chipset Model:          ATY,R200

      Type:          Display

      Bus:          AGP

      Slot:          SLOT-A

      VRAM (Total):          64 MB

      Vendor:          ATI (0x1002)

      Device ID:          0x514c

      Revision ID:          0x0000

      ROM Revision:          113-85710-123

      Displays:

    Apple Studio Display:

      Display Type:          LCD

      Resolution:          1024 x 768

      Depth:          32-bit Color

      Built-In:          Yes

      Core Image:          Not Supported

      Main Display:          Yes

      Mirror:          Off

      Online:          Yes

      Quartz Extreme:          Supported

    Display:

      Status:          No display connected

     

     

    This  is a legacy system that I use with my UMAX Mirage IIse. I'll clone the system and try a combined update to 10.4.11 next. I know there was reason I didn't upgrade the OS, but don't remeber what the incompatibility was in the past.

  • by J D Knight III,

    J D Knight III J D Knight III Sep 2, 2011 8:37 AM in response to J D Knight III
    Level 4 (3,415 points)
    Sep 2, 2011 8:37 AM in response to J D Knight III

    I've done it before, and I just tried it again. I hooked it up to my MBP Early 2011 via DisplayPort>DVI adaptor and the same result. The proximity sensor lights up but no control panel is opened. The brightness controll is absent in the Monitors control panel, and a mouse and keyboard still work. The display is correctly identified in the control panel as well.

     

    I'm beginning to think the problem might be in the display itself.

  • by JeanLuc7,

    JeanLuc7 JeanLuc7 Sep 11, 2011 1:50 PM in response to J D Knight III
    Level 1 (5 points)
    Sep 11, 2011 1:50 PM in response to J D Knight III

    Unfortunately that is also possible. One of my 17" Studio Displays shows the same misbehaviour. Also the USB ports on the backside have gone.