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Stoffer
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PostPosted: Sun Nov 23, 2003 9:19 pm    Post subject: Fan/processor making noise Reply with quote

For some reason my fan (i think it's my fan) is making an annoying high-pitched whine when my computer is just sitting doing nothing. When I start an application like XMMS, it stops though (I'm sure it's not just that I can't hear it because of the music, it really does stop). Is there anything I could do about this? It doesn't whine when I boot Windows or if I boot the 2.4.22 kernel. I'm currently using the 2.6 test 9 kernel.
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TheCoop
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PostPosted: Sun Nov 23, 2003 10:16 pm    Post subject: Reply with quote

take the cover off and have a look at it when its whining and not whining. Probably worth getting one of those air sprayers and just hosing the inside of the fan and case
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Stoffer
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PostPosted: Sun Nov 23, 2003 11:10 pm    Post subject: Reply with quote

I can't really take the cover off, it's a laptop so it's really difficult. Also, I did spray compressed air into it and it didn't help. Like I said, when I'm playing songs in XMMS it doesn't whine, but when it's just sitting there it does, and nothing happens in Windows either.
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captnjameskirk
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PostPosted: Mon Nov 24, 2003 3:46 pm    Post subject: Reply with quote

Thought I'd jump in, since all the avatars are matrix-related. :)

It may not actually be your processor fan that's making the noise. Whenever the graphics chip on my laptop is rendering anything with GL, it makes a very faint (but high-pitched) noise. However, you may want to
Code:
ACCEPT_KEYWORDS="~x86" emerge cpudyn
and see if that helps.
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Rhysem
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PostPosted: Mon Nov 24, 2003 4:30 pm    Post subject: Reply with quote

If you aren't using sound on the laptop at the time, try muteing all channels. Probably crosstalk/interference in the audio chipset from something big and powerhungry, like the GPU or CPU.

I know my desktop box has picked up an annoying whine/buzz that comes out thru the speakers when it is doing window scrolling. I don't think it did it before, but I'm not sure as there was so much more noise in my room before I probably wouldn't have noticed (fans, AC, etc).

May have to drop back in my SBLive card. I don't think it has similar problems.
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Stoffer
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PostPosted: Mon Nov 24, 2003 4:40 pm    Post subject: Reply with quote

I emerged cpudyn then ran it and the whining instantly stopped...what did it do?
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Stoffer
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PostPosted: Mon Nov 24, 2003 4:43 pm    Post subject: Reply with quote

Acutally it's back now...
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ctford0
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PostPosted: Mon Nov 24, 2003 6:28 pm    Post subject: Reply with quote

Sitting doing nothing?

could this be related to some type of processor throttling slowing down the cpu fan? Not making the sound when running an app is what makes me think this. Also running the 2.4 vanilla kernel might not make the whinning sound because the 2.6 series has some major acpi enhancements.

chris
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ozonator
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PostPosted: Mon Nov 24, 2003 10:54 pm    Post subject: Reply with quote

Stoffer wrote:
I emerged cpudyn then ran it and the whining instantly stopped...what did it do?


cpudyn manages your CPU speed, by reducing the CPU frequency when your system isn't busy, and increasing it when it is; it does this continuously as long as it's running, based on how much load there is on the CPU. The default config includes sensible settings for most people's machines. In general, CPU frequency scaling is a Good Thing -- it keeps your CPU and laptop cooler when it's idle, and extends your battery life.

Re. the whine, have you determined whether it's a fan or something else? Running cpudyn should let things be cooler, at least when the system is idle, so if it's a fan, this should help. Could be interference from the CPU coming through over the speakers, though, and if so, cpudyn might modulate the sound, but not eliminate it altogether if it's something that comes through when the CPU runs at full clock speed; muting would be a test for that.
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Stoffer
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PostPosted: Tue Nov 25, 2003 10:20 am    Post subject: Reply with quote

It's not coming through my speakers, I know that. When I compile the latest test kernel I'll build in CPU Throttling, because I thought that was causing a problem last time so I left it out. We'll see what happens after that.
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