Red Hat Bugzilla – Bug 425950
[PATCH] ath5k does not associate after suspend
Last modified: 2008-03-11 09:01:27 EDT
Description of problem:
After a suspend to ram, a wireless card does not associate to the accesspoint
any more. Even stopping/starting NetworkManager etc. does not solve this.
Unloading the module crashes the machine every second time.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot into kernel
2. use NetworkManager to connect to wireless spot (WPA encrypted)
No network connection possible
Network connection as before suspend
Machine is a Thinkpad T43 (ATI X300 video card, Atheros 5312 WLAN device)
Do you get any sort of output from the crash?
Created attachment 289915 [details]
section from /var/log/messages just resuming from sleep
I'm just trying to get useful logs or to find a reproducible way to crash the
kernel via suspend/resume. Attached is a section cut from /var/log/messages
showing wakeup from resume.
I'm not really sure, whether the line stopping disk etc. while resuming is
right. Even "disabling non-boot-cpus" looks like coming from suspend.
I am seeing the exact same symptoms, reproducible every time, with a thinkpad T41.
If anyone can suggest what additional info can be useful, I would be happy to
1. service NetworkManager stop && ifconfig ath0/wlan0 down && modprobe -r ath5k
2. Wait a few minutes (why?)
3. ifconfig wlan0 up && service NetworkManager start
reconnects to AP (for me), but not every time. Sadly I don't know exactly, what
On my system, unencrypted connections work without a problem. Also I can connect
to WEP network after a resume, if I unload the ath5k mac80211 and cfg80211 modules.
For me, the failure mode involves lots of
WEP decrypt failed (ICV)
messages, coming from dmesg. Does this happen for you as well?
I also seem to have to wait a few minutes after unloading ath5k
in order to have a chance to connect to the AP with NetworkManager.
However, unloading the modules during suspend and using
system-config-network instead of NetworkManager works every time.
Does anyone have any suggestions on how to track this down?
OK, I have a WPA2 encrypted link and use NetworkManager. Normally,
wpa_supplicant is not started as service; after suspend it looks like
wpa_supplicant is started. Stopping it seems to enhance a chance getting a
I'll try to reproduce this at the weekend or to configure a network connection
I can't confirm nor deny WEP decrypt messages. My var/log/messages is already
appended to this bugzilla entry.
Created attachment 292306 [details]
Clear the key cache after resume in the ath5k driver
Recompiling the kernel with the attached patch fixes this problem for me,
and I can connect to WEP networks after a suspend-resume cycle.
It seems that on my computer, the key cache comes back as junk after resume,
causing the bug. I suppose this patch should be merged with the
Another crash after unloading ath5k. Sadly, nothing is logged into
/var/log/messages. Any recommendations, how to get more information about this one?
Thanks a lot! Your attached patch solves my problem. After recompiling a recent
kernel (22.214.171.124-107) with your supplied patch I was able to connect directly
I'd appreciate, if this patch could go into ath5k/fedora kernels.
NEEDINFO for me? What is the question?
As I wrote in my first post, a device managed by ath5k did not associate to an
access point after suspend/resume. I did try to unload/load the module after
resume. That brought me some kernel crashes, but not each time. Sadly, there is
no message /stack trace in /var/log/messages
With the patch applied to the kernel, those problems do not occur any more. Thus
I don't need to unload ath5k.
As I said at #10, I'd really appreciate, if the patch would be integrated in
fedora kernels. Is it possible, to get the patch into fedora kernels?
That is a rawhide kernel, but AFAIK it should work on F8. There should be an
F8 kernel with it soon, but I'm not sure exactly when -- I'll let you know.
Thank you! That sounds great! since I was able to compile a kernel for F8, I'll
wait for a new F8 kernel.
Did the fix get into kernel-126.96.36.199-115.fc8? There were some fixes for
wireless, so I tried it. Sadly, after suspend ath5k does not reconnect. Either,
the fix does not work with the new version, or it didn't make it into 2.6.23-14-115
Not in -115
fixed in 188.8.131.52-12.
Thanks a lot.