Comment 147 for bug 971809

Don't know if this is of any help, but my experience with kernel 3.10-rc4 & the patches from power management off and patches from http://msujith.org/patches/test/Jun-05-2013/ is that the signal strength & data rate go down very much after ca. 30 seconds. Both with and without disable_ani. Distance between computer and AP ca. 30 cm.

When I connect to the wlan AP from nm-applet, data rate 72,2Mbps

          Link Quality=58/70 Signal level=-52 dBm
          Link Quality=60/70 Signal level=-50 dBm

Then after ca. 30 seconds, data rate drops to 1Mbps:

          Link Quality=49/70 Signal level=-61 dBm
          Link Quality=47/70 Signal level=-63 dBm
          Link Quality=48/70 Signal level=-62 dBm
          Link Quality=54/70 Signal level=-56 dBm
          Link Quality=46/70 Signal level=-64 dBm
          Link Quality=40/70 Signal level=-70 dBm

The values fluctuate somewhat, but the drop of ca. 10 dBm after ca. 30 seconds appears to be quite systematic.

Not sure what to look for in the logs or which parts to post.

Hardware: asus transformer book tx300 (4005)

lspci -v:

01:00.0 Network controller: Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01)
 Subsystem: AzureWave Device 2126
 Flags: bus master, fast devsel, latency 0, IRQ 16
 Memory at f7c00000 (64-bit, non-prefetchable) [size=512K]
 Expansion ROM at f7c80000 [disabled] [size=64K]
 Capabilities: [40] Power Management version 2
 Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
 Capabilities: [70] Express Endpoint, MSI 00
 Capabilities: [100] Advanced Error Reporting
 Capabilities: [140] Virtual Channel
 Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
 Kernel driver in use: ath9k

Wlan AP: Sierra 4G/wlan router