I've recently started using Linux Mint on my Dell E7440 laptop with AR9485 chip. Intermittently, the wireless will drop to 1Mbit/sec (as observed with iwconfig) or my ping times will go to 2000ms+.
syslog shows strange things I don't understand, such as :
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Jul 6 12:44:12 mark-e7440 kernel: [ 888.193261] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jul 6 13:07:00 mark-e7440 kernel: [ 2257.537009] ath: phy0: Failed to stop TX DMA, queues=0x004!
Jul 6 13:07:00 mark-e7440 kernel: [ 2257.548366] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x0000a400
Here is the output of mintWifi.py script:
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$ sudo /usr/lib/linuxmint/mintWifi/mintWifi.py
-------------------------
* I. scanning WIFI PCI devices...
-- Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
==> PCI ID = 168c:0032 (rev 01)
-------------------------
* II. querying ndiswrapper...
-------------------------
* III. querying iwconfig...
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"TheSatellite"
Mode:Managed Frequency:2.427 GHz Access Point: 34:6F:90:2C:6C:80
Bit Rate=11 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=23/70 Signal level=-87 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:165 Invalid misc:1780 Missed beacon:0
-------------------------
* IV. querying ifconfig...
eth0 Link encap:Ethernet HWaddr 34:e6:d7:49:e8:9f
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:20 Memory:f7e00000-f7e20000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:6439 errors:0 dropped:0 overruns:0 frame:0
TX packets:6439 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:630067 (630.0 KB) TX bytes:630067 (630.0 KB)
wlan0 Link encap:Ethernet HWaddr d0:53:49:b0:9b:75
inet addr:172.20.32.156 Bcast:172.20.63.255 Mask:255.255.224.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:305307 errors:0 dropped:1 overruns:0 frame:0
TX packets:242888 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:320758729 (320.7 MB) TX bytes:43285600 (43.2 MB)
-------------------------
* V. querying DHCP...
RTNETLINK answers: File exists
-------------------------
* VI. querying nslookup google.com...
Server: 75.75.75.75
Address: 75.75.75.75#53
Non-authoritative answer:
Name: google.com
Address: 216.58.192.14
thank you
