TP-Link WDR3600: 2, 4GHz WLAN aus, dmesg: Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down

[Andreas Stenglein]

Habe gerade beobachtet dass eine WLAN Lampe leuchtet anstelle blinkt,
es sieht so aus als ob 2,4GHz nicht funktioniert.

dmesg:
[    0.000000] Linux version 5.4.188 (fbl@) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r16554-1d4dea6d4f)) #0 Sat Apr 16 12:59:34 2022
[    0.000000] printk: bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 0001974c (MIPS 74Kc)
[    0.000000] MIPS: machine is TP-Link TL-WDR3600 v1
[    0.000000] SoC: Atheros AR9344 rev 2
[    0.000000] Initrd not found or empty - disabling initrd

...

[  474.939938] br-client: port 4(w2ap) entered forwarding state
[  475.027054] IPv6: ADDRCONF(NETDEV_CHANGE): w2ap: link becomes ready
[  475.054258] IPv6: ADDRCONF(NETDEV_CHANGE): w2configap: link becomes ready
[  475.086689] IPv6: ADDRCONF(NETDEV_CHANGE): w5configap: link becomes ready
[  476.976769] IPv6: ADDRCONF(NETDEV_CHANGE): w2mesh: link becomes ready
[  477.000050] IPv6: ADDRCONF(NETDEV_CHANGE): w5mesh: link becomes ready
[  477.614265] batman_adv: bat0: Adding interface: w2mesh
[  477.619769] batman_adv: bat0: Interface activated: w2mesh
[  477.656159] batman_adv: bat0: Adding interface: w5mesh
[  477.661579] batman_adv: bat0: Interface activated: w5mesh
[ 1078.541981] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[ 1905.958993] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[ 1951.014402] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[ 1952.038669] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[ 1953.062443] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[ 2960.673892] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[ 3045.664839] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 1 is up
[ 3165.109887] batman_adv: bat0: Adding interface: fffVPN
[ 3165.115253] batman_adv: bat0: The MTU of interface fffVPN is too small (1426) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
[ 3165.140365] batman_adv: bat0: Interface activated: fffVPN
[ 8965.355789] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[ 9065.707323] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[ 9067.755037] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[13014.218688] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[35714.060807] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[35786.764454] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down
[35925.002913] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is up
[39086.066217] Atheros AR8216/AR8236/AR8316 mdio.0:00: Port 5 is down

Frage: kann man das irgendwie "einschalten"?

Zusatzinfo: der Router hat beim Booten schon manchmal nicht funktioniert, manchmal hat es etwas länger gedauert, manchmal ging gar nichts, allerdings war es möglich per TFTP neu zu flashen.
Ich vermute ein Problem mit der CPU (BGA?), will aber ohne Ersatzrouter nicht dran herumexperimentieren.

freundliche Grüße,
Andreas