Thinkpads Forum

I have a T60p with 10.6.6(T7600/V5250 graphics). Almost everything works fine(except for sleep and wireless, which I've given up on) thanks to the great people on this forum. I use SL as my main OS, but there is a permanent, annoying electrical buzzing sound (like from an old CRT TV) which doesn't seem to occur when using XP, so this is obviously not a hardware issue. It changes pitches, depending on what I do and even though I can't seem to find the exact source of the noise, it sounds like it's coming from somewhere behind the screen. Does anybody else experience this issue? Have you found a fix, if so?

It seems you faced a problem with C-States switching which occurs on Windows sometimes as well. http://www.thinkwiki.org/wiki/Problem_w ... tch_noises

If so you need to edit your C-States scheme which is a kind of complex thing. You can try also replacing IOPlatformPluginFamily.kext.
If you're using Sebinouse's package (http://forum.thinkpads.com/viewtopic.php?f=32&t=86621) you may try to edit your Info.plist inside LegacyX60T.kext package. I was experiencing this kind of noise on Lion when I was editing C-States and what I did I combined my MacXXX.plist model inside IOPlatformPluginFamily.kext from various MacBook models. But as I know the things are a bit different on 10.6.X

Anastasius wrote:It seems you faced a problem with C-States switching which occurs on Windows sometimes as well. http://www.thinkwiki.org/wiki/Problem_w ... tch_noises

If so you need to edit your C-States scheme which is a kind of complex thing. You can try also replacing IOPlatformPluginFamily.kext.
If you're using Sebinouse's package (http://forum.thinkpads.com/viewtopic.php?f=32&t=86621) you may try to edit your Info.plist inside LegacyX60T.kext package. I was experiencing this kind of noise on Lion when I was editing C-States and what I did I combined my MacXXX.plist model inside IOPlatformPluginFamily.kext from various MacBook models. But as I know the things are a bit different on 10.6.X

I'm using my custom package, which I've built together myself, after tinkering around with the hardware. One thing which I couldn't enable no matter what I've tried were exactly the C-States, I've tried with kexts and with the new Chameleon RC5 bootloader, which has two methods of generating C-States. None of them seemed to work, I've checked in ioreg, they just don't show up. I won't be able to upgrade to anything higher than 10.6.6 (no Lion, for now) because of the V5250 that I have, they've updated the some frameworks in the later versions and it doesn't seem to play along well anymore(it just stays at that looping blue screen when booting).