Currently Being ModeratedJul 30, 2012 3:29 AM (in response to dereism)
One work around until they release the Mountain Lion patch updateis install smc Fan Control. Basically by defauly the fan runs at 2000RPM and this allows you to increase that minimum. I have set it to 4000RPM and there is very minimal audible difference and it is bringing the core temparature down for the most part all of the time. You can go higher but I think thats overkill.
smc Fan Control is free, after you install it, it resides in your notification area in the top right (this is where you can change settings etc)
Hope this helped you as I know personally how annoying these overheats can be.
Currently Being ModeratedJul 30, 2012 3:34 AM (in response to Ivan Clarke1)
Thanks for this... Though I remain concerned why my iMac went from a quiet, speedy, available machine to a weird, noisy, overheating, unreliable piece of equipment due to what seems to be a simple OS upgrade.
Currently Being ModeratedJul 30, 2012 3:36 AM (in response to dereism)
Yes, its a problem. SMC fanm control will help cool down your machine and avoid any permenant damage. but please do monitor it.
I hope that Apple will release a fix very soon.
Currently Being ModeratedJul 30, 2012 3:41 AM (in response to Ivan Clarke1)
Thanks for the info, Ivan Clarke1.
I can understand indexing going on for an extended period of time after a major installation.
But what bugs me here are those short bursts activity which suggests – in my non-professional mind – a process that crashes immediately after it is initiated and then restarts and gets caught in an endless loop.
This is suggested by the total absence of feedback whatsoever from the Spotlight Menu-extra and Search text field.
Currently Being ModeratedJul 30, 2012 3:49 AM (in response to Ivan Clarke1)
Though I am curious: Any ideas as to what fans are dealing with what problem, and thusly: which should be monitored?
It would seem like they are all going crazy, should I view this as purely blind, or this to be triaged? Activity Monitor showed no abnormailty besides unsettling HDD behavior...
Edit: Oh do I miss the days of having a case to open.
Currently Being ModeratedJul 30, 2012 3:50 AM (in response to dereism)
I don't know of any other tool, but if you have a bootable backup of a former System on an external drive or DVD, I would try to find out if it is a hardware problem by booting on it and see if it still overheats.
Currently Being ModeratedJul 30, 2012 4:06 AM (in response to dereism)
The fans solution is merely there to keep your CPU temprature down. this is just an interim measure. you can fiddle around and save some settings and instantly switch to whatever fan setting you need to keep the operating temprature to normal levels.
Currently Being ModeratedJul 31, 2012 2:39 AM (in response to khopster)
Had the same issue, thought it was due Spotlight reindexing data, but it lasted several days.
Try to open Activity Monitor, click CPU and you will see what is loading your processor the most. Try to stop that process.
In my case it was TVMobili app, probably incompatible with ML. I have uninstalled it together with all related files and now its much better.
Currently Being ModeratedJul 31, 2012 8:16 AM (in response to tonjik)
In my case, as I mentioned earlier, it is mdworker that is using almost 100% of CPU usage. I should say WAS using almost 100% of CPU usage. Because I think I definitely fixed the problem.
I had installed Mountain Lion 10.8 over a Lion 10.7.4 clone on an external drive so as not to nuke my internal 10.7.4 in case something went wrong.
As all went well, and after a day or two of testing and updating, I "Carbon Copied" my working brand new Mountain Lion back to my internal drive. And that is when this mdworker 100% CPU usage started the overheating problem.
This morning, I remembered that yesterday, while cloning back my Mountain Lion installation to my internal drive, I had declined Carbon Copy's invitation to also create a 10.8 recovery partition, thinking that it wouldn't be of any use.
I then decided to start over Mountain Lion's cloning to my internal drive, but this time, WITH the installation of the 10.8 Recovery Partition.
I don't know how to explain – or if there is a link – but Mountain Lion is now working flawlessly on my internal drive, and mdworker seems happy and has been quiet for more than 2 hours now. My processor's temperatures went down from a steady 55-58 C yesterday to a mere 32-34 C eversince.
Anybody knows if there is a link between Spotlight indexation os a Mountain Lion partition and the existence or not of its relevant Recovery partition ?
Currently Being ModeratedJul 31, 2012 11:34 AM (in response to khopster)
Same heating problem (and battery drainage). I upgraded my macbook air summer 2012 to ML on last Friday. The first 2 days were okay. Yesterday (Monday), I fully charged it, and when I was off from work, I unplugged and made it to sleep. Around midnight, when I wanted to use it for some work, I found it to be warm and even heated up the documents put next to it in my bag. The battery drained to ~50%. I used it for ~20 min without plugging in (only for internet and reading some ducuments). This morning, I got to plug it to power so I could wake it up!