On Tue, Aug 14, 2018 at 2:24 PM "Jürgen Bausa" <[email protected]> wrote:
> I have a Xiaomi Air 12 Laptop (Intel Core m3-7Y30, Network controller: > Intel Corporation Wireless 8260 > (rev 3a)). I use debian Stretch (linux 4.9.0-7-amd64) with KDE and > Network-Mananger (1.6.2-3). > > Until now, wifi worked fine. However, after I exchanged my router (which > had only 2.4 GHz) against a > newer model that has both 2.4 and 5 GHz (both frequencies with the same > ssid), I experienced the > following problem: The computer switches permanently between both > frequencies. This happens approximately > every 2 minutes. In /var/log/messages I find the following: > > Aug 12 14:45:12 lina kernel: [ 2256.208621] wlp1s0: disconnect from AP > xx:xx:xx:xx:xx:xx for new auth to yy:yy:yy:yy:yy:yy > Aug 12 14:45:12 lina kernel: [ 2256.213032] wlp1s0: authenticate with > yy:yy:yy:yy:yy:yy > Aug 12 14:45:12 lina kernel: [ 2256.223163] wlp1s0: send auth to > yy:yy:yy:yy:yy:yy (try 1/3) > Aug 12 14:45:12 lina NetworkManager[564]: <info> [1534077912.6843] device > (wlp1s0): supplicant interface state: completed -> authenticating > Aug 12 14:45:12 lina kernel: [ 2256.228342] wlp1s0: authenticated > Aug 12 14:45:12 lina kernel: [ 2256.229481] wlp1s0: associate with > yy:yy:yy:yy:yy:yy (try 1/3) > Aug 12 14:45:12 lina kernel: [ 2256.230627] wlp1s0: RX AssocResp from > yy:yy:yy:yy:yy:yy (capab=0x11 status=0 aid=1) > Aug 12 14:45:12 lina kernel: [ 2256.231932] wlp1s0: associated > Aug 12 14:45:12 lina NetworkManager[564]: <info> [1534077912.6931] device > (wlp1s0): supplicant interface state: authenticating -> associated > Aug 12 14:45:12 lina NetworkManager[564]: <info> [1534077912.7338] device > (wlp1s0): supplicant interface state: associated -> 4-way handshake > Aug 12 14:45:12 lina NetworkManager[564]: <info> [1534077912.7414] device > (wlp1s0): supplicant interface state: 4-way handshake -> completed > > where xx:xx:xx:xx:xx:xx the MAC of 2.4 and yy:yy:yy:yy:yy:yy the MAC of 5 > GHz net is. > > However, this happens not at all places in my house. Near the router, 5 > GHz is much stronger than 2.4 Ghz > and the system keeps th 5 GHz net. But in the living room, both nets have > nearly the same strength and the > systems switches all the time. > > I found a lot of description of exactly this problem, but no solution on > the net. See e.g. > https://forum.manjaro.org/t/frequent-wifi-disconnect/12211 > > https://jeremyfelt.com/2017/01/02/things-i-learned-or-broke-while-trying-to-fix-my-wireless-in-ubuntu-16-10/ > > https://www.archybold.com/blog/post/intermittent-connectionhigh-packet-loss-intel-wireless-driver-iwlwifi-ubuntu-linux-networkmanager > > I think there should be some treshold that avoids switching between nets > based on small fluctiations. But > where can I set this treshold. And is the switching caused by NM or by the > driver? As the bugreports > mention different adapters, I think its not driver specific. > > Any hints welcome. > > juergen > > This is a long time nuisance of mine with NM and wpa-supplicant in Linux. I just set the BSSID in NM to the MAC of the 5Ghz chip on the AP . This also keeps it from scanning into 2.4 and causing 10 seconds drop outs. Unfortunately, I do not think a better way exists in Linux, which is unfortunate for us desktop users. IMO, it is a major flaw that needs to be reworked ground up - it only happens on Linux (compared to MacOS and Windows on the same AP anyway - I have never run *BSD variants on a desktop machine). - Greg
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