Crackling sound with Alsa after update.

Hi all !
After my last upgrade I noticed a crackle in the sound but only on the left channel when I plug in my headphones. I don't know if this crackle is present with the laptop's speakers since they are very crappy (Macbook white falling-apart-body 1st gen); at least I can't head it.
The funny thing, is that if I have the headphones plugged during booting, there is no crackle once the system is running ! My system is fully up-to-date, here is the kernel version and alsaversion:
kernel26 2.6.30-5
alsa-lib 1.0.20-1
I have to add, I just brought this pair of headphones and they are very good, maybe the problem has been here for ages but I've never noticed it !
Any suggestions ?
Thanks for reading !

I would suggest trying another pair of headphones just to see if it does the same thing. I am not saying buy a new pair but use someones elses or such. that at least should start narrowing down the problem

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