I think http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8-rc6-raring/
has the bug also.
~$ uname -a
Linux buzz-dee-desktop 3.8.0-030800rc6-generic #201301312135 SMP Fri Feb 1
02:36:25 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
~$ iwconfig
wlan1 IEEE 802.11bgn
Mode:Managed Frequency:2.437 GHz
Bit Rate=2 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=31/70 Signal level=-79 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1989 Invalid misc:5826 Missed beacon:0
~$ dmesg | egrep '\<ath\>|ath9k'
[ 319.522776] ath: EEPROM regdomain: 0x809c
[ 319.522784] ath: EEPROM indicates we should expect a country code
[ 319.522789] ath: doing EEPROM country->regdmn map search
[ 319.522793] ath: country maps to regdmn code: 0x52
[ 319.522797] ath: Country alpha2 being used: CN
[ 319.522800] ath: Regpair used: 0x52
[ 319.544841] ieee80211 phy0: Selected rate control algorithm
'ath9k_rate_control'
[ 5043.736046] ath: phy0: Failed to stop TX DMA, queues=0x001!
[ 5045.716177] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[ 5045.729036] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[ 5045.751117] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[ 5045.751130] ath: phy0: Could not stop RX, we could be confusing the DMA
engine when we start RX up
[ 5045.766824] ath: phy0: Failed to stop TX DMA, queues=0x005!
[10364.984196] ath: phy0: Failed to stop TX DMA, queues=0x004!
[10366.736013] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[10366.749112] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[10366.762559] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[10366.784996] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
[10366.785004] ath: phy0: Could not stop RX, we could be confusing the DMA
engine when we start RX up
[10366.800307] ath: phy0: Failed to stop TX DMA, queues=0x005!
[14422.040940] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x000062c0
[14422.040993] ath: phy0: Could not stop RX, we could be confusing the DMA
engine when we start RX up
[14422.063960] ath: phy0: Failed to stop TX DMA, queues=0x001!
[24897.719993] ath: phy0: Failed to stop TX DMA, queues=0x001!
[46222.024223] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024
AR_DIAG_SW=0x42000020 DMADBG_7=0x000062c0
[46222.024242] ath: phy0: Could not stop RX, we could be confusing the DMA
engine when we start RX up
[46222.033494] ath: phy0: Failed to stop TX DMA, queues=0x001!
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https://bugs.launchpad.net/bugs/1032826
Title:
168c:0023 ath9k wifi slow, and frequently disconnects/reconnects
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