Messages in this thread | | | Subject | Re: many "changed bandwidth, new config is" messages in the log | From | Johannes Berg <> | Date | Thu, 24 Nov 2016 16:12:14 +0100 |
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On Thu, 2016-11-24 at 15:07 +0000, Michal Hocko wrote:
> I have only now managed to move to 4.9-rc5 (from 4.8) and started > seeing quite a lot of following messages > " > [ 346.612211] wlan0: AP c0:4a:00:f1:48:f2 changed bandwidth, new > config is 2472 MHz, width 1 (2472/0 MHz) > [ 352.655929] wlan0: AP c0:4a:00:f1:48:f2 changed bandwidth, new > config is 2472 MHz, width 2 (2462/0 MHz) > "
I don't think these messages are new in any way. checking ... nope, it's been around that way since 3.9 :-)
> It always seems to be changing width from 1 -> 2 and back
Makes sense, that's 20 MHz <-> 40 MHz.
Did you buy a new device that says it's 40 MHz incompatible or something? Or perhaps one of your neighbors did ... Or something is causing interference that makes the AP switch around.
> $ dmesg | grep "changed bandwidth" | wc -l > 42 > in 13 minutes of uptime. I have noticed this came in via 30eb1dc2c430 > ("mac80211: properly track HT/VHT operation changes").
Right, but that went into 3.9 :-)
> Is this something to be worried about?
Not at all. I suppose we could make this a debug message though, it's not super useful when it happens OK (sometimes it causes disconnections when we can't support the new mode, which is more relevant).
johannes
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