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Old 11-26-2012, 10:09 AM
reza.kashef reza.kashef is offline
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Default Can you see this entry in your log file?

kernel: COEX: downgraded chanspec 0x2d04 to 0x2b02: channel x used by exiting BSSs

Hi

As the topic implies, can you see the entry in your log file?
I cant find it in the FW source code, so if someone knows EXACTLY what this is please inform me!

Thanks in advance!
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Old 11-26-2012, 12:39 PM
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It's the wireless driver simply adapting itself to the presence of other networks causing interference with it. This is just a normal notice, it doesn't indicate any real problem.
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Old 11-26-2012, 01:54 PM
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I believe it is the wireless downgrading from 40 to 20MHz.
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Old 11-27-2012, 03:21 AM
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Thank you.

RMerlin: It is the ”adapting” part I’m interested in.

This has nothing to do with “downgrading” from 40 to 20MHz, neither with changing of the channel in auto mode.

I have 2 routers operating in the same neighborhood (roughly the same interference), one with FW .220 and the other with .260.
In the log file for the .220 router I see the entry all the times but never in the one running .260.
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Old 11-27-2012, 10:09 AM
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Quote:
Originally Posted by reza.kashef View Post
Thank you.

RMerlin: It is the ”adapting” part I’m interested in.

This has nothing to do with “downgrading” from 40 to 20MHz, neither with changing of the channel in auto mode.

I have 2 routers operating in the same neighborhood (roughly the same interference), one with FW .220 and the other with .260.
In the log file for the .220 router I see the entry all the times but never in the one running .260.
Asus has been experimenting with ways to make the router more stable under high interference environments. They added a new option to manually trigger that behaviour while they look deeper into the root issue - that's what the Enhanced Interference Management option under Wireless -> Professional will toggle how the router react if there's too much radio interference.

I'm not sure if that downgrade is related to the channel width or to switching to a different channel. If you have your router set to "Auto" for the channel selection, then that might be what you are seeing in the log - a switch to a less crowded channel. Unfortunately, I don't know enough about the lowlevels of the wireless driver itself to know for sure.
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Old 11-28-2012, 03:15 AM
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Thanks RMerlin

Yes, I also suspected that this might have something to do with the "Enhanced Interference Management" (wl interferance).

As I mentioned before the log entry has nothing to do with a channel or bandwidth change, I think that the driver calls the fw about the interference and at the same time logs this.
I have found the string in an object file but nothing in the fw source.

Is it right that the "Enhanced Interference Management" option, when enabled sets interference = 4 and when disabled sets it to 0?

Oh, by the way, do you know if and where the wl interference equivalent value is stored in nvram?

Last edited by reza.kashef; 11-28-2012 at 04:55 AM. Reason: Add a question
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Old 11-28-2012, 10:05 AM
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Quote:
Originally Posted by reza.kashef View Post

As I mentioned before the log entry has nothing to do with a channel or bandwidth change, I think that the driver calls the fw about the interference and at the same time logs this.
I have found the string in an object file but nothing in the fw source.
The driver is closed source. Fairly sure that this message comes from the wireless driver itself and not from the firmware.

Quote:
Originally Posted by reza.kashef View Post
Is it right that the "Enhanced Interference Management" option, when enabled sets interference = 4 and when disabled sets it to 0?
That's correct.

Quote:
Originally Posted by reza.kashef View Post
Oh, by the way, do you know if and where the wl interference equivalent value is stored in nvram?
The value itself isn't stored in nvram, only the state of that option you mentioned. The nvram setting wl_noisereduction will be set to 0 or 1.
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