Low brightness on iMac Windows 8 Bootcamp?

I installed windows 8.1 one week ago on my iMac. 2011 model (i5 2.7ghz, 4gb ram, 21" screen). The brightness was lower as soon as the windows desktop came up. Everything says it's at full brightness yet it's extremely dull compared to when the computer boots in osx. How do I fix this? I see a "howtogeek.com/107173/" article popping up in similar posts but it's not working as I'm using an iMac, not a Macbook. Does anyone know of a solution to this? Please help!

Control Panel > Power options > change plan settings for your currently selected power plan > change advanced power settings and in the new window look for adaptive brightness.
Seems to work!

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Windows 8 Bootcamp Low Brightness Issue?

Hi There
I have had my MacBook for 6 months now. Due to a new course I have taken up, I decided to partition my hard drive using the preinstalled bootcamp application. I used windows 7 home premium that I purchased, everything was fine with it after some tinkering and downloading the software unitility files from my Mac OS X and placing the files in Windows 7 and etc. I then upgraded to windows 8 Pro and since I have done this (it installed perfectly and runs beautifully) my brightness has automatically decreased. When I increase the screen brightness to full it is only half as bright as it was when running Mac OS X or Windows 7. When I turn the brightness down the screen display dims completely a little under half way down the brightness statues bar.
I have tried:
- Adjusting the adnvanced brightness settings on Windows 8 as instructed on WiseGeek or some what website (I believe this did not work as it was a guide for an automatic self adjusting brightness glitch)
- Adjusting a certain brightness level file in the registry editor in Windows 8 that was to do with Nvidia- but the file that they told me to look for I could not locate (maybe this is the issue; I lack this file?)
Any help would be much appreciated; please do not hesitate to ask for any extra information.
Many thanks
creyesweeney

This may do the trick:
http://www.howtogeek.com/107173/

IMac, low brightness, sound buzz

Hi, i'm italian mac user, and i bought my imac ( 27" i7 1 Tb HDD 4 Gb Ram) last week, and other user tell me to try to make low brightness in my mac and effectively if i make the brightness to low i feel buzz on foundation. The problems is only low brightness, it's normal ?
It's a hardware or software problem ?
There are other user that have this problem ?
Thanks for disponible

Hi swolpe.
I can confirm this on my late iMac 27" i7.
The buzzing is actually the fan from what I can venture to guess. The buzzing is on the top left near the edge of the vent and is present when the CPU load is rather high for extended periods.
As others are describing, the noise is less noticeable when the screen is at full brightness vs being at the dimmest setting. If it is a fan issue, then perhaps at full brightness there is a voltage drop to the fan; which would indicate that the power supply may just be adequate.
Regardless, it is most annoying - and this is after it had replaced a new 17" unibody macbook pro (core2duo 3Ghz) which destroyed three replacement power supplies. Under heavy load in the macbook pro laptop would actually drain the battery while it had AC power. The "dead" power supply bricks would only push out ~48watts compared when brand-new when it would push out 70-80watts.
Product looks good but doesn't deliver quality .... really disappointed.
With the iMac 27" - other issues are:
The latest Bootcamp (3.1) update which had alleged Windows 7 support forced the ATI graphics driver to render in 16bit mode (did a driver rollback to revert to 32bit color).
The screen never goes in power saving mode within Windows ... never.
My MightyMouse has already burnt through 6 AA batteries in 2 months.

Bootcamp 3.1 and imac windows 7 64bit update not installing. Audio issues!

After many days of work getting the windows 7 working in bootcamp in my imac 27 (still with audio issues) I eagerly awaited the bootcamp update and imac updates.
Neither will install.
Then I find that according to tech support as of now I have to reinstall Windows 7 again for the updates to work!
It took me 5 full 8 hours days to get all my scientific programs installed and working, now I find I can't even simply update the drivers I need. I don't want to reinstall.
My only issues are audio.
Here they are:
1) The headset jack works fine on the Mac side, but in Windows 7, it causes the i7 intel CPU to go crazy. There is no CPU spike on the mac side.
2) The headset jack in the imac is a trrs jack. The same as in the iphone, a tri-band jack that has three bands, two audio out channels and one mic in channel. A trrs headset works fine on the mac side with using the headset mic (as in iphone) rather than the built in mic. (this provides much better quality for sound recording). I don't want to use a usb mike.
In Windows 7 the mic part of the trrs headset does not work.
3) In Windows 7 when going into audio devices recording, no audio mixer shows up, so when I do video or audio screen capture the only way to capture the sound is through the speakers and then back through the imac built in mic, rather than directly through the unit. (terrible sound quality) On the mac side the mixer element works fine.
Now I find from other imac users that even the new updates for the imac on windows 7 don't address and fix the audio issues. I am sure not going to go through 5 more days work only to find the audio issues still don't work.
I need these audio aspects to work properly though!
I have tried to get drivers for the cirrus logic audio card, but guess what there are none available and cirrus logic doesn't even recognize the board or offer drivers.
I have many windows programs I must have for my scientific research!I bought the top of the line Imac with all the bells and whistles because Apple promised that the machine could run Windows 7 in bootcamp natively!
It doesn't. This has been a nightmare of problems.
Is Apple going to step up to the plate and make good on their promises?
Does any one have a fix for any of the audio issues, or know how to install the new drivers without a complete reinstall of Windows?
Installing a few sound drivers and software should not require a complete reinstall. Getting the proper drivers for the headset jack audio in and audio out jack should be the most basic of fixes. Making the audio mixer work should be elementary.
If you are an Apple tech person or an Apple user that can help on these issues, please do!
Thanks, Dr. Duke
An American profesor in Europe.
PS I will post this under Imac windows 7 updates without a reinstall and under
imac Sound issues.

On another thread a few people have responded saying that their imac has the same situation, the cpu is going crazy and the imac gets hot with headphones or speakers plugged in. But this doesn't happen in the mac side.
If you have an late 2009 imac and don't have these audio issues, let us hear from you. If you don't, lay out the problem here.
Here is my last two cents in to the inquiry.
Not only does the cpu run crazy but the imac 27 gets very, very hot. Since I unplugged the headphones, it runs much, much cooler.
Certainly, some Mac engineers should take care of this problem, it seems it is universal on all the imac 27's and from what I gather, the smaller screened cousins too.
Also, we certainly want a stereo mix option for audio in or out, or what is called "what you hear" or wave out. Imac is supposed to be much geared to multimedia apps.
Finally, the mic jack part of the trrs set up MUST be fixed! A lot of manufacturers are going to headset combo jacks as they call them, mic in and stereo out on the same tribanded plug. But, the old single jack for mic in and single jack for stereo out are two tiny parts of the hardware and super inexpensive for the manufacturer. Why in the **** to go to the "advanced" triplug if the **** thing doesn't work.
Mac has a great reputation. I hope they remedy these problems right away.
Anyone whose imac 27 or 24 whose headset plug is working correctly. Let us know! I don't think anyone's is, but I think that few people understand that their cpu is running so much faster with the plug in, plus few even understand the combo jack and the triband, or trrs audio jack! Out of 4 audio technicians I talked to, not one of them knew what a trrs jack was or that you even have a mic in jack as part of the headset jack!
When I told one senior that it worked on the Mac side, he didn't believe for a while, thought my sound might be recorded from the onboard mic, but I proved it to him by tapping iaudibly on my iphone mic headset and and it showing up in garage band clearly and listening to big difference in audio.
As for a usb audio adapter, I am in a neon light environment and find that those adapters are more sensitive to electrical interference. Besides I want to use the headset jack as it was meant to be used!
Thats it.
Again, if anyone using an imac 27 and windows 7 64 or 32 doesnt have these problems, let us know! We are all anxious for a fix!
Best to all!

Locks up on google, yahoo mail, running windows 7 on imac with bootcamp

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I tried installing Windows 7 on my new 27" iMac using Bootcamp. When I installed, however, the installation did not complete successfully. This is because after the initial setup, Windows can't seem to continue and doesn't get onto the "Setting up for first usage" screen - I just get a black screen, and the iMac reboots after several minutes.
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Even at lowest possible brightness under Windows 7,
this is much too bright for working in the evening/night.
I was using VistaShades under Vista, but now under Windows 7
VistaShades only darkens the background!
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It seems like it's a known issue after I researched about it.
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Should I exchange it?
Thanks for the help!

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Low brightness on iMac Windows 8 Bootcamp?

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