driver wireless ath9k parou de funcionar no kernel Linux 4.9

Question

Eu estou executando o Gentoo com o kernel 4.4 agora. Quando tentei atualizar para 4.9, meu driver sem fio (ath9k) finalmente parou de funcionar. No 4.4, o wireless funciona bem.

Na primeira inicialização em 4.9, o wireless funcionará bem por algum tempo, mas eventualmente a conexão começará a desacelerar e chegará a um ponto morto. Eu não tenho certeza qual é a fonte da causa, exceto que ela tem algo a ver com a versão 4.9 do kernel.

dmesg:

[  654.808240] wlp3s0: authenticate with XX:XX:XX:XX:XX:XX
[  654.825789] wlp3s0: send auth to XX:XX:XX:XX:XX:XX (try 1/3)
[  654.827856] wlp3s0: authenticated
[  654.829768] wlp3s0: associate with XX:XX:XX:XX:XX:XX (try 1/3)
[  654.833827] wlp3s0: RX AssocResp from XX:XX:XX:XX:XX:XX (capab=0x411 status=0 aid=2)
[  654.833934] wlp3s0: associated 

Registros do NetworkManager:

Feb 12 17:04:15 laptop-gentoo NetworkManager[2116]: <warn>  [1486937055.8134] sup-iface[0x1662ab0,wlp3s0]: connection disconnected (reason -4)
Feb 12 17:04:15 laptop-gentoo NetworkManager[2116]: <info>  [1486937055.8276] device (wlp3s0): supplicant interface state: completed -> disconnected
Feb 12 17:04:15 laptop-gentoo NetworkManager[2116]: <info>  [1486937055.9196] device (wlp3s0): supplicant interface state: disconnected -> scanning
Feb 12 17:04:16 laptop-gentoo NetworkManager[2116]: <info>  [1486937056.9935] device (wlp3s0): supplicant interface state: scanning -> authenticating
Feb 12 17:04:17 laptop-gentoo NetworkManager[2116]: <info>  [1486937057.0005] device (wlp3s0): supplicant interface state: authenticating -> associated
Feb 12 17:04:17 laptop-gentoo NetworkManager[2116]: <info>  [1486937057.0137] device (wlp3s0): supplicant interface state: associated -> 4-way handshake
Feb 12 17:04:17 laptop-gentoo NetworkManager[2116]: <info>  [1486937057.0232] device (wlp3s0): supplicant interface state: 4-way handshake -> completed