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Can’t adjust brightness on ADC monitor [message #19514] Fri, 12 October 2012 12:42 Go to next message
Geke is currently offline  Geke
Messages: 28
Registered: August 2012
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Junior Member
I have two monitors on a PowerMac G4 (dual 500MHz): one is a Viewsonic
on DVI, the other an Apple Studio 17" on ADC.
Is it normal that I can’t adjust the brightness on the Apple monitor
now?
There’s no slider for it in the screen’s preferences, and pressing the
button on the screen frame doesn’t bring up the usual dialog.
Maybe I should mention that both monitors are connected to the same
graphics card, a GeForce4 MX (AGP).

If this is indeed the common behaviour, my theory is that the OS
(10.4.11) can’t get a handle on the Viewsonic’s brightness, and then
disables the software control for both.
But I think it’s strange, given that other settings can be adjusted
for each screen separately.

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Re: Can’t adjust brightness on ADC monitor [message #19533 is a reply to message #19514] Fri, 12 October 2012 13:00 Go to previous messageGo to next message
Bruce Johnson is currently offline  Bruce Johnson
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Registered: August 2012
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Senior Member

On Oct 12, 2012, at 9:42 AM, Geke wrote:

> I have two monitors on a PowerMac G4 (dual 500MHz): one is a Viewsonic

> on DVI, the other an Apple Studio 17" on ADC.

> Is it normal that I can’t adjust the brightness on the Apple monitor

> now?


"Now" implies something has changed...what is it? Do you get the expected behavior back when whatever that is is undone? You should be able to do everything separately on the two monitors. Did you try trashing the display prefs? Changing monitor profiles?


--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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Re: Can’t adjust brightness on ADC monitor [message #20447 is a reply to message #19533] Sun, 21 October 2012 09:13 Go to previous message
Geke is currently offline  Geke
Messages: 28
Registered: August 2012
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Junior Member
(What's happening? I was sure I had posted this already...)

OK, I did my homework better this time and it turns out the button on the
screen's frame (Apple Studio Display 17") doesn't bring up the brightness
dialog even when it's the only screen connected to the PowerMac.
That's not as I remember it, but I can't say 100% sure that it has worked
correctly in the past, because I've been working with several such screens.

So I looked around where the display prefs are and moved them (there were
two files) to the desktop, then restarted. The button's behaviour remained
the same: it lights up when pressed, but no dialog box appears.

Anyway, no new prefs file was created until I changed the profile of a
monitor, which gives me the feeling these display prefs are not involved
with this error. Maybe it's hardware, after all? Or the system software? I
really don't know.
I guess the next step will be to borrow a ADC screen and see how that
behaves on this computer, or connect this screen on a different PowerMac.

"Now" implies something has changed...what is it? Do you get the expected
> behavior back when whatever that is is undone? You should be able to do

> everything separately on the two monitors. Did you try trashing the display

> prefs? Changing monitor profiles?

>

>

> --

> Bruce Johnson

> University of Arizona

> College of Pharmacy

> Information Technology Group

>

> Institutions do not have opinions, merely customs

>

>

>


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You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
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