Currently Being ModeratedJul 1, 2011 9:53 AM (in response to KelvinLeFabuleux)
Kelvin -- Same here, connecting a 2011 MacBook Pro to a 2009 iMac 27" and using Target Display Mode. The volume adjustment keys work, but not the display brightness. This used to work prior to 10.6.8...
Currently Being ModeratedJul 4, 2011 7:53 AM (in response to KelvinLeFabuleux)
Same here. Late 2009 iMac 27". This must be a bug. (Apple: please fix this, thanks!)
As a temporary solution I installed one of the brightness control apps you can find in the App store.
I used Midnight from Ollix, searching for 'brightness' in the app store reveals some more.
<note: controlling brightness this way affects colors and is no REAL fix, just makes your eyes hurt less until the bug is fixed>
Currently Being ModeratedJul 7, 2011 1:01 AM (in response to KelvinLeFabuleux)
Same issue. 27" mid 2010 iMac and 2011 MBP. Full brightness but it started first with target display getting lost : iMac display was not recognized on the MBP. CMD-F2 was just flashing the screen black and nothing. Had to reboot iMac to enjoy the 27" full brightness.
Same issue using Mac Pro with HD5870 as a source.
Audio still working as expected, through Display Port, and through Line In for the Mac Pro.
Currently Being ModeratedJul 21, 2011 10:44 PM (in response to KelvinLeFabuleux)
I had the same problem on my 27" iMac (late 2010) under OS X 10.6.8.
Sadly, upgrading to Lion still hasn't fixed the bug.
Currently Being ModeratedJul 24, 2011 5:29 PM (in response to KelvinLeFabuleux)
This bug is still apparent the latest developer builds of Lion. I wonder if this means a fix won't appear in 10.7.1.
Currently Being ModeratedJul 28, 2011 9:11 PM (in response to KelvinLeFabuleux)
This bug was introduced in 10.6.7 with the addition of Thunderbolt. Until Apple bother to fix their mess, the only solution I have found is to restart the iMac repeatedly until you are able to control the brightness in target display mode. FYI, I use target display mode with an AMD Radeon 6990 connected to my iMac, your result may vary with a Mac to Mac.
Currently Being ModeratedAug 11, 2011 8:16 AM (in response to KelvinLeFabuleux)
I've the same issue with 10.7.0 on iMac and MacBook Pro.
Currently Being ModeratedAug 12, 2011 9:59 AM (in response to KelvinLeFabuleux)
Exactly same problem is here. I have upgraded to Lion OS. Apple, please fix it on priority basis.
Currently Being ModeratedAug 19, 2011 8:01 AM (in response to jeevanx)
Updated my iMac to 10.7.1 and the bug is still there. However, a sign of hope: 10.7.2 may fix this annoying issue. See post #11 here: http://forums.macrumors.com/showthread.php?t=1177587
Currently Being ModeratedSep 23, 2011 12:03 PM (in response to ramm1964)
For others wanting a fast reply, the thread above indicates this is fixed in OSX Lion 10.7.2. This update has the iCloud bits in it so it will be out within a week or two at the most.
Currently Being ModeratedOct 12, 2011 12:22 PM (in response to Mike95)
I've installed 10.7.2 on my iMac. It has fixed the problem : I can now change the brightness using the iMac keyboard when I use it as target display for my MacBook Pro.
Yeaah, finally !
Currently Being ModeratedJan 20, 2012 8:52 PM (in response to KelvinLeFabuleux)
I installed 10.7.2 on both iMac and MacBook Pro. The problem persists for me.
It started with 10.6.8 as stated above, full brightness no controls :-(
Currently Being ModeratedJan 26, 2012 5:00 AM (in response to KelvinLeFabuleux)
I am stuck having to keep 10.6.8 because I have an irreplaceable peripheral that will never go beyond Snow Leopard. This issue of Imacs in target mode has gone on for a long time. Apple has fixed it in Lion but this isuue has existed in SL since 10.6.7. PLEASE APPLE!! Fix this.
Currently Being ModeratedJan 26, 2012 8:26 AM (in response to BK Studio)
As mentioned, it's not fixed in Lion for me (even though some people reported so). Anybody else having the problem persist in Lion?
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