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Brightness when in Target display mode

L

Lebatteux

macrumors newbie
Original poster
Jun 26, 2011
3
0
Hi all,

I'm not surer if I'm the only person having this problem, but have failed to find any reference to it anywhere on the web so far so figured I'd ask the experts !! D
:)

I am using my late 2010 27" iMac in target display mode for my pc to play games on. It works fine except for one thing.

When I change over the display using command f2 the brightness goes to max.
When o change back it's dim again

Eveywhere is telling me the brightnessn keys should still alter the bright ness during target display mode, however mine do nothing.

I've tried a dusting the brightness on the windows machine buts it not the same as the physical adjustments on the monitor

Does anyone have any thoughts ?? I'm using the apple wireless keyboard
 
Even if the target display mode, only the brightness of the screen keyboard, the volume and sequence of keys Display Target Mode is active. All other keyboard will be ignored. USB, FireWire, and different input data from the keyboard to ignore try this may be your problem will be resolved.
 
Last edited:
coxhead andy said:
Even if the target display mode, only the brightness of the screen keyboard, the volume and sequence of keys Display Target Mode is active. All other keyboard will be ignored. USB, FireWire, and different input data from the keyboard to ignore try this may be your problem will be resolved.
Click to expand...

That's the thing though. The volume and target display switch both work at all times during the use of target display mode, but the brightness keys don't.

Do your brightness keys work ?

Mine do but only when using the osx desktop
 
This was apparently broken in 10.6.8. I use target display mode frequently. The Brightness keys no longer work at all since the 10.6.8 update.
 
DJRumpy said:
This was apparently broken in 10.6.8. I use target display mode frequently. The Brightness keys no longer work at all since the 10.6.8 update.
Click to expand...


I spoke to Apple today who didn't seem to know what I was talking about !
however, I think they#'re now telling me the brightness keys on the IMAC are for adjusting target displaymode when using another apple product only.

I'm now looking for drivers that I can apply to Windows 7 instead to see if I can get it to reconise the Imacs display properly and adjust the brightness.

I may be getting the wrong end of the stick, but I think most places are telling me to install bootcamp on my windows machine ?? which will give me a birghtness slider bar , anyone done this ?

Also, I guess there's a slim change that the next update will tackle the issue ?
 
You should also file a bug report:

https://bugreport.apple.com/

I've never seen that the target display mode requires an apple display for the target display. I think the person you spoke to was blowing smoke up your arse ;)

This was obviously broken with the last update and will hopefully be resolved with a later update.
 
fyi, I received a reply on mine a few days ago that this was a known issue so they are at least aware of it.
 
It has been addressed somewhat in 10.7.2. It still opens in target mode at full brightness but it is at least adjustable again via the keyboard keys. Hopefully they will fully implement a fix but it's something at least.
 
DJRumpy said:
It has been addressed somewhat in 10.7.2. It still opens in target mode at full brightness but it is at least adjustable again via the keyboard keys. Hopefully they will fully implement a fix but it's something at least.
Click to expand...

Good to hear. Something else to look forward to in .2.
 
10.7.2 has been in beta for quite a few weeks as it contains the iCloud bits which is a pretty big update. I'm still hopefully they fully implement the brightness fix but I haven't seen a new beta in a hair over a week (which reminds me, I should go out and check ;)
 
Hmmm, you're right, I never noticed this. I'm still on SL so I guess I won't see that fix anytime soon. Since I'm only playing games the brightness is ok. I have noticed the occasional glitch (brief flicker) while playing but other than that it works great.

Cheers,
 
Xenc said:
There is light at the end of the tunnel. Brightness control has been restored in the 11C37 seed of 10.7.2. Finally!
Click to expand...

I just confirmed this while using the last beta! My eyes were starting to hurt at night...
 
It's actually been in 10.7.2 for weeks. It is not perfect yet, but the ability to adjust the brightness was put back weeks ago. It still defaults to full brightness though. It's better than it was at least.
 
mike95 said:
I just confirmed this while using the last beta! My eyes were starting to hurt at night...
Click to expand...

Just for some additional information, at home I have iMac 27" 2010 and it required 10.7.2 to control the brightness. At office I have iMac 27" 2011 w/Thunderbolt with 10.7.1 and not only does it control the brightness, it remembers it too. Additionally, I can control the volume with a non Apple keyboard -- something that is not possible via display port as the display port device's volume is in control disabling the local volume control.
 
mike95 said:
Just for some additional information, at home I have iMac 27" 2010 and it required 10.7.2 to control the brightness. At office I have iMac 27" 2011 w/Thunderbolt with 10.7.1 and not only does it control the brightness, it remembers it too. Additionally, I can control the volume with a non Apple keyboard -- something that is not possible via display port as the display port device's volume is in control disabling the local volume control.
Click to expand...

To those still having issues (I just did when I connected my DisplayPort-equipped 27" iMac (2010) to my MacBook Pro 15" (Thunderbolt 2 / 2014), use the free app Shades to adjust brightness if your keyboard doesn't adjust brightness levels properly.

Note: I have no issues adjusting brightness with my USB Apple Keyboard, it just doesn't work with my bluetooth Magic Keyboard.

Shades: http://www.charcoaldesign.co.uk/shades
 
Unfortunately, Shades has no effect on iMac's brightness control. Shades adjusts brightness but in a different way and is limited to whatever iMac's brightness control was set to.

Looking for a solution to freeze iMac 2010 brightness at 50% no matter what iMac sets it to (such as 100% after switching to TDM).
 
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