Atheros AR922x dont like 802.11n since todays Kernel-Update

Corubba · 2011-04-14 19:07:48

Hey Guys,

Inside of my Desktop works an D-Lan PCI WLAN card with the Atheros AR922s chipset, supported by the ath9k Kernel Module. The last half year als works fine, until today morning after i upgraded my kernel to version 2.6.38.2-1, and after the reboot my WLAN sucks. I checked with my Laptop, all fine, so the Source was not the router or my internet connection. So i tested around with the 802.11 standards and different Channels, and i could figure out that when i use some combination of 802.11n with b or/and g it goes to low speed (send normal but recieve only around 100kb/s) but iwconfig and the connection-info of the NetworkManager-Applet shows normal 300MB/s.

I also updated my laptop which uses an Intel Wifi adapter, no problems.

Any ideas? maybe some kind of module bug?

greetz corubba

EDIT: oh i forgot, the signal strength is always 75+, mostly above 90. WPA2-Encrypted.

Last edited by Corubba (2011-04-14 19:15:22)

king.flasher.dave · 2011-04-14 19:31:51

Confirmed, have the same issue with a AR928X since kernel2.6.38 (bug report?)
Connection speed is extremely choppy. Right now there's noone but me in this network and surfing becomes paaaaaainful.

@Corubba: Did you find a solution through working out your routers settings?
Will try the same now... but that might break WLAN support for an older adapter in my network... grml.. -_-

milomouse · 2011-04-14 19:32:58

I can confirm this problem since 2.6.38 with AR9287 with ath9k, after upgrading from 2.6.36. Same scenario, but no ideas so far although I haven't done a thorough search yet, just suffering with slow internet since then.. I may actually downgrade.

Corubba · 2011-04-14 22:10:03

@king.flasher.dave: i set my router to use 802.11b+g at channel 10 (2,457GHz) with full power. Seems to work but only with 54MB/s, no 300 support.

king.flasher.dave · 2011-04-14 23:25:17

@Corubba: ugh... that sucks then... only one non n-compatible card in the network... the other guys will be... "pleased" :>

milomouse · 2011-04-15 00:32:55

@anyone: https://bugzilla.kernel.org/show_bug.cgi?id=31452#c19

I created the /etc/modprobe.d/ath9.conf file with

options ath9k nohwcrypt=1

and rebooted my computer (or alternatively rmmod and modprobe?) and so far so good, but only time will tell. Can anyone else try this?

Edit: Some odd hours later with this change and it's still going great. I suggest trying this.

Last edited by milomouse (2011-04-15 03:43:48)

king.flasher.dave · 2011-04-15 09:55:57

@milomouse: thanks! Can confirm this to work (right now)! Seems to fix the speed issues. Hope they'll fix that bug soon in kernel :>

Corubba · 2011-04-15 13:09:42

also working for me. thx milomouse

kvn · 2011-04-27 08:43:27

Thank you so much for that fix @milomouse. I actually tried so hard to believe it was my router at first, then my computer placement, then decided to google the chipset name + arch linux, which lead me here. All my transfers were capped at 50 kB/s and I was going mad. Now back to normal!

king.flasher.dave · 2011-05-03 22:15:12

@kvn: It's not a fix, but a workaround. Disabling the hwcrypt settings is not a solution. You should revert that setting when the fix has been applied to kernel. Don't forget about it!

kvn · 2011-05-09 11:37:23

Will do, thanks for the correction.

Arch Linux

#1 2011-04-14 19:07:48

Atheros AR922x dont like 802.11n since todays Kernel-Update

#2 2011-04-14 19:31:51

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#3 2011-04-14 19:32:58

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#4 2011-04-14 22:10:03

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#5 2011-04-14 23:25:17

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#6 2011-04-15 00:32:55

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#7 2011-04-15 09:55:57

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#8 2011-04-15 13:09:42

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#9 2011-04-27 08:43:27

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#10 2011-05-03 22:15:12

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

#11 2011-05-09 11:37:23

Re: Atheros AR922x dont like 802.11n since todays Kernel-Update

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