Bug 59691

Summary:	Bad connectivity with ath9k AR9485 when power management off
Product:	Drivers	Reporter:	jkp (jkp)
Component:	network-wireless	Assignee:	drivers_network-wireless (drivers_network-wireless)
Status:	CLOSED CODE_FIX
Severity:	low	CC:	jkp, linville, sujith
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.10-rc5	Subsystem:
Regression:	No	Bisected commit-id:

Description jkp 2013-06-14 05:18:09 UTC

Moved from https://bugzilla.kernel.org/show_bug.cgi?id=49201https://bugzilla.kernel.org/show_bug.cgi?id=49201 where it came up:

All works fine with power management off with fixes from bug 49201, but with power management off, when I look at the iwconfig bit rate every five
seconds, it's mostly 65 Mbps but about every once in 25 .. once in 50 it's 1
Mbps. Also, occasionally there are longer periods of low speed
(1..30 Mbps) and this affects also practical usability quite a lot.

Hardware: asus transformer book tx300 (4005)

Comment 1 Sujith 2013-06-17 20:40:26 UTC

Can you load the driver with debug=0x8f49 and post the kernel log when this issue happens ? Also the contents of the debugfs files, "rc_stats", "xmit".

If you can use the wireless-testing tree, that would be great since it contains the latest code and patches are posted against it, for John to pick up.

Comment 2 jkp 2013-06-18 07:29:57 UTC

OK, I try to do that but probably not in the next few days. It seems mostly this is not a big practical issue, had power management off for a long while and didn't notice any big problems.

To correct the description, I meant to write that all works fine power management on, but the problems are with power management off.

Comment 3 Sujith 2013-08-20 06:21:36 UTC

Are you still seeing this issue with the latest wireless-testing kernel ?

Comment 4 jkp 2013-08-23 11:36:28 UTC

I'll test, pulling the wireless-testing tree now.

Comment 5 jkp 2013-08-25 06:55:40 UTC

I can't repeat the reported issue with wireless-testing tree pulled at 2013-08-23.

Also, no significant difference observed with power on & off behaviour looking at the speed as reported by iwconfig and speedtest.net. 

With 3.11.0-rc6-wl+, compared to the earlier 3.10.0-rc6, I did have some more trouble getting the wlan connected. But that might well be slight differences in the location of the computer & base station & other wiring.

Comment 6 Sujith 2013-08-26 03:43:55 UTC

Ok, thanks for testing.