Hallo kB,
mit 5.13:
georg@swift:~$ uname -a
Linux swift 5.13.0-41-generic #46~20.04.1-Ubuntu SMP Wed Apr 20 13:16:21 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
georg@swift:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
link/ether 74:e5:f9:bd:2a:13 brd ff:ff:ff:ff:ff:ff
georg@swift:~$ nmcli device
DEVICE TYPE STATE CONNECTION
wlp2s0 wifi verbunden sweet_home_base_5GHz
p2p-dev-wlp2s0 wifi-p2p nicht verbunden --
lo loopback nicht verwaltet --
georg@swift:~$ modinfo -F srcversion iwlwifi
1DE978A76F5FA09624ADDCE
[ 8.633592] Bluetooth: hci0: unexpected event for opcode 0xfc2f
[ 8.651658] Bluetooth: hci0: Intel BT fw patch 0x32 completed & activated
[ 8.815425] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 8.815434] Bluetooth: BNEP filters: protocol multicast
[ 8.815442] Bluetooth: BNEP socket layer initialized
[ 8.826048] NET: Registered protocol family 38
[ 11.926129] rfkill: input handler disabled
[ 12.098354] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 12.105366] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 12.403862] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 12.403877] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 12.526986] wlp2s0: authenticated
[ 12.529888] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 12.533757] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8c (capab=0x1511 status=0 aid=4)
[ 12.535568] wlp2s0: associated
[ 12.646379] wlp2s0: Limiting TX power to 27 (30 - 3) dBm as advertised by 38:10:d5:5a:91:8c
[ 12.670409] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 12.852252] kauditd_printk_skb: 23 callbacks suppressed
[ 12.852259] audit: type=1400 audit(1658575838.587:35): apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed" pid=2611 comm="cups-browsed" capability=23 capname="sys_nice"
[ 19.409895] rfkill: input handler enabled
[ 20.796455] Bluetooth: RFCOMM TTY layer initialized
[ 20.796471] Bluetooth: RFCOMM socket layer initialized
[ 20.796486] Bluetooth: RFCOMM ver 1.11
[ 23.504883] rfkill: input handler disabled
sofortiger (!) Neustart mit 5.15; Verbindung unauffällig (wie bei 5.13 und Verbindung zum 5 Ghz Band):
eorg@swift:~$ uname -a
Linux swift 5.15.0-41-generic #44-Ubuntu SMP Wed Jun 22 14:20:53 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
georg@swift:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
link/ether 74:e5:f9:bd:2a:13 brd ff:ff:ff:ff:ff:ff
georg@swift:~$ nmcli device
DEVICE TYPE STATE CONNECTION
wlp2s0 wifi verbunden sweet_home_base_5GHz
p2p-dev-wlp2s0 wifi-p2p nicht verbunden --
lo loopback nicht verwaltet --
georg@swift:~$ modinfo -F srcversion iwlwifi
40FD69FEC12568AA09FE04D[ 8.081831] Bluetooth: hci0: unexpected event for opcode 0xfc2f
[ 8.099827] Bluetooth: hci0: Intel BT fw patch 0x32 completed & activated
[ 8.355658] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 8.355667] Bluetooth: BNEP filters: protocol multicast
[ 8.355675] Bluetooth: BNEP socket layer initialized
[ 8.403991] NET: Registered PF_ALG protocol family
[ 8.707977] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
[ 8.786992] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
[ 8.788535] iwlwifi 0000:02:00.0: FW already configured (0) - re-configuring
[ 12.336947] rfkill: input handler disabled
[ 12.539906] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 12.547115] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 12.869185] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 12.869201] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 12.993248] wlp2s0: authenticated
[ 12.997230] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 13.000806] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8c (capab=0x1511 status=0 aid=4)
[ 13.004020] wlp2s0: associated
[ 13.137552] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 13.137785] wlp2s0: Limiting TX power to 27 (30 - 3) dBm as advertised by 38:10:d5:5a:91:8c
[ 13.334106] kauditd_printk_skb: 23 callbacks suppressed
[ 13.334116] audit: type=1400 audit(1658576292.187:35): apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed" pid=2614 comm="cups-browsed" capability=23 capname="sys_nice"
[ 19.957334] rfkill: input handler enabled
[ 20.901320] Bluetooth: RFCOMM TTY layer initialized
[ 20.901337] Bluetooth: RFCOMM socket layer initialized
[ 20.901351] Bluetooth: RFCOMM ver 1.11
[ 25.169545] rfkill: input handler disabled
WLAN ausgeschaltet übers Menu, gewartet und reaktiviert, es dauert eine Weile bis die Verbindung steht (siehe auch dmesg Auszug) und letztlich wird das 2.4Ghz Band genommen:
[ 226.837957] wlp2s0: disassociated from 38:10:d5:5a:91:8c (Reason: 2=PREV_AUTH_NOT_VALID)
[ 227.253325] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 227.259733] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 227.263520] wlp2s0: authenticated
[ 227.266951] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 227.274032] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8c (capab=0x1511 status=0 aid=4)
[ 227.278104] wlp2s0: associated
[ 227.417424] wlp2s0: Limiting TX power to 27 (30 - 3) dBm as advertised by 38:10:d5:5a:91:8c
[ 288.527227] wlp2s0: deauthenticating from 38:10:d5:5a:91:8c by local choice (Reason: 3=DEAUTH_LEAVING)
[ 297.838064] i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
[ 352.521217] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
[ 352.602871] iwlwifi 0000:02:00.0: Applying debug destination EXTERNAL_DRAM
[ 352.604764] iwlwifi 0000:02:00.0: FW already configured (0) - re-configuring
[ 356.318898] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 356.325695] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 356.381844] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 356.716248] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 356.716262] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 356.771825] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 356.845671] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 356.916435] wlp2s0: authentication with 38:10:d5:5a:91:8c timed out
[ 357.171783] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 357.179726] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 357.253329] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 357.309683] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 357.358107] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 357.358121] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 357.421734] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 357.476641] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 357.520794] wlp2s0: authentication with 38:10:d5:5a:91:8c timed out
[ 358.196134] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 358.203477] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 358.278926] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 358.332170] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 358.375596] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 358.375610] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 358.448578] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 358.513713] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 358.517919] wlp2s0: authenticated
[ 358.519877] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 358.577085] wlp2s0: associate with 38:10:d5:5a:91:8c (try 2/3)
[ 358.627648] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8c (capab=0x1511 status=30 aid=0)
[ 358.627669] wlp2s0: 38:10:d5:5a:91:8c rejected association temporarily; comeback duration 1000 TU (1024 ms)
[ 359.659925] wlp2s0: associate with 38:10:d5:5a:91:8c (try 3/3)
[ 359.739966] wlp2s0: association with 38:10:d5:5a:91:8c timed out
[ 375.618382] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 375.625568] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 375.630136] wlp2s0: authenticated
[ 375.634009] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 375.738030] wlp2s0: associate with 38:10:d5:5a:91:8c (try 2/3)
[ 375.739645] wlp2s0: deauthenticated from 38:10:d5:5a:91:8c while associating (Reason: 9=STA_REQ_ASSOC_WITHOUT_AUTH)
[ 382.631237] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 382.638981] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 382.952066] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 382.952080] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 383.076390] wlp2s0: authenticated
[ 383.080848] wlp2s0: associate with 38:10:d5:5a:91:8c (try 1/3)
[ 383.085175] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8c (capab=0x1511 status=0 aid=4)
[ 383.089059] wlp2s0: associated
[ 383.169215] wlp2s0: Limiting TX power to 27 (30 - 3) dBm as advertised by 38:10:d5:5a:91:8c
[ 383.169257] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 428.211882] wlp2s0: deauthenticating from 38:10:d5:5a:91:8c by local choice (Reason: 3=DEAUTH_LEAVING)
[ 446.354514] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 446.361037] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 446.407630] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 446.465928] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 446.509418] wlp2s0: authentication with 38:10:d5:5a:91:8c timed out
[ 455.213998] wlp2s0: authenticate with 38:10:d5:5a:91:8c
[ 455.222125] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 1/3)
[ 455.286377] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 2/3)
[ 455.356404] wlp2s0: send auth to 38:10:d5:5a:91:8c (try 3/3)
[ 455.413053] wlp2s0: authentication with 38:10:d5:5a:91:8c timed out
[ 483.600587] wlp2s0: authenticate with 38:10:d5:5a:91:8b
[ 483.607782] wlp2s0: send auth to 38:10:d5:5a:91:8b (try 1/3)
[ 483.919211] wlp2s0: authenticate with 38:10:d5:5a:91:8b
[ 483.919265] wlp2s0: send auth to 38:10:d5:5a:91:8b (try 1/3)
[ 484.044541] wlp2s0: authenticated
[ 484.047502] wlp2s0: associate with 38:10:d5:5a:91:8b (try 1/3)
[ 484.054604] wlp2s0: RX AssocResp from 38:10:d5:5a:91:8b (capab=0x1431 status=0 aid=6)
[ 484.058137] wlp2s0: associated
[ 484.148104] wlp2s0: Limiting TX power to 20 (20 - 0) dBm as advertised by 38:10:d5:5a:91:8b
[ 484.148203] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
georg@swift:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
link/ether 74:e5:f9:bd:2a:13 brd ff:ff:ff:ff:ff:ff
georg@swift:~$ nmcli device
DEVICE TYPE STATE CONNECTION
wlp2s0 wifi verbunden sweet_home_base_2.4GHz
p2p-dev-wlp2s0 wifi-p2p nicht verbunden --
lo loopback nicht verwaltet --
georg@swift:~$ modinfo -F srcversion iwlwifi
40FD69FEC12568AA09FE04D
...:8b ist 2.4 GHz, ...:8c ist 5 Ghz.
Das Verhalten nach dem manuellen Abschalten entspricht meinen Beobachtungen mit 5.15 Kernel ohne die getrennten Wlan Verbindungsmöglichkeiten. Der Compi versucht die 5 Ghz Verbindung aufzubauen, scheitert, baut die 2.4 Ghz Verbindung auf. Dann versucht er aufgrund der besseren Datenrate auf 5 Ghz zu wechseln, scheitert und wechselt zurück. Dieses Verhalten habe ich beim 5.13 Kernel nie gesehen.
Die gemeinsame SSID ist Bestandteil eines Fritzbox Mesh und läuft so problemlos, die meisten clients hängen am 5 Ghz und dies ist auch das Band zur 2. Fritzbox.