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Estel's Avatar
Posts: 5,028 | Thanked: 8,613 times | Joined on Mar 2011
#206
Originally Posted by zerox View Post
Firstly, thank you for all your work on the power kernel, and on the functionalities which it enables, most recently KP51 and the new USB Mode Switch.

However, after installing and testing KP51, I have once again found myself reverting to the stock kernel, as I have done previously after installing KP49 and KP50. The reason is that the power kernels seem to degrade the quality of SIP and Skype calling, and this is a deal-breaker for me.

I have searched the forums and found that other users have reported similar experiences. Some of these users believe that the problem arises from the changes in the way the power kernel controls cpu scaling and power management.

Would it be possible for you to produce, or advise how to produce, an experimental kernel which follows the stock kernel's approach to cpu scaling and power management (i.e. no support for overclocking/undervolting), while retaining as many as possible of the other changes which make the power kernel so useful?

Thanks for any help you can give, and again, please accept my sincere appreciation of the work that you do.
Unfortunately, it happens on stock kernel too, and many wise heads were shaked at it, without results. There is "decades" old bug 10388, which, surprisingly, wasn't marked won't fix by Nokians.... But, wasn't fixed either.

It's not simply about degrading quality. the problem is that randomly - sometimes never, sometimes after few seconds, and sometimes after a long as 30 minutes or more - audio for one side (usually, one on N900) starts to sound like experiencing packet loss. Sound become, gradually, more and more distorted, lacking parts of it, to the point of absolute silence on line (for party affected by this, 2nd one hear everything fine).

Surprisingly, suspending call and immediately activating it again, fixes it - until i re-appears again. In case, where it appears after 30 minutes, it's not much of a problem, but every 30 seconds definitely is irritating thing.

It was proved beyond any doubt, that it's not related to net settings, or any other "ambient" thing. It's for sure something on N900, and I would literally bless one, who would fix it. Hoever, it doesn't seem to be kernel-power related, and for sure isn't related to frequency management. Possible candidates are sophiasip & friends, but no one knows for sure. Reading comments on bug report I've provided earlier, you will see many "I got it!" ideas, that later were proved wrong, and bug is as healthy, as it was at the beginning.

As a notorious SIP-user, I'm equally pissed about it.

/Estel
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