On Tue, Jun 19, 2012 at 1:34 PM, Jon Wikne <Jon.Wikne@xxxxxxx> wrote: > Hi List, > > I am experiencing a puzzling problem with WLAN on a Toshiba Qosmio > F750 laptop, running CERN SLC 5.8 (mostly identical to RHEL 5.8), > but with kernel 2.6.39.4. (The kernel that came with the distro did > not work properly with WLAN on this machine at all.) please quickly try http://linuxwireless.org/en/users/Download#Where_to_download_bleeding_edge or the latest wireless testing tree http://linuxwireless.org/en/developers/Documentation/git-guide#Cloning_latest_wireless-testing > > What happens is that the WLAN comes up flawlessly, and works well > until it suddenly hangs. This happens when (or seconds after) I see > an entry like the following in the log: > > Jun 18 19:04:42 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > > I do not understand why cfg80211 does this long after the connection > has been established. If I understand correctly, this "regulatory > domain" business only makes sense when the WLAN interface is started. > > Subsequent DHCP requests are issued, but never answered: > > Jun 18 19:23:38 redcat dhclient: DHCPREQUEST on wlan0 to 137.138.16.6 port > 67 (xid=0x63998557) > Jun 18 19:24:16 redcat last message repeated 3 times > Jun 18 19:25:30 redcat last message repeated 6 times > ..... > Jun 18 19:50:10 redcat dhclient: DHCPREQUEST on wlan0 to 255.255.255.255 > port 67 (xid=0x63998557) > Jun 18 19:50:55 redcat last message repeated 3 times > ..... > Jun 18 19:58:41 redcat dhclient: No DHCPOFFERS received. > > I interpret this as something has (effectively) been turned off, > but that the drivers do not realize this. > > Restarting WLAN when the problem has occurred is simple: > > root@redcat 97 # /sbin/ifdown wlan0 > root@redcat 98 # /sbin/ifup wlan0 > > What puzzles me even more is that cfg80211 seems to be activated > and mess up things at highly irregular intervals, ranging from > a few minutes to many hours: > > root@redcat 105 # tail -2000l /var/log/messages | grep cfg80211 > Jun 17 20:28:51 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 17 23:09:37 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 17 23:36:01 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 09:27:59 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 11:57:48 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 18:42:00 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 18:46:49 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 19:04:42 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > Jun 18 22:40:42 redcat kernel: cfg80211: Calling CRDA to update world > regulatory domain > > At the time of writing this (Tue 19 Jun 2012 09:27:54 CEST) the WLAN > has not stopped since the last entry in the above. What on earth is > governing the timing in this? > > Some relevant info on the laptop: > > root@redcat 108 # lspci > ..... > 03:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless > Network Adapter (PCI-Express) (rev 01) > ..... > > root@redcat 109 # lsmod > Module Size Used by > ..... > ath9k 89934 0 > mac80211 160999 1 ath9k > ath9k_common 3051 1 ath9k > ..... > ath9k_hw 291258 2 ath9k,ath9k_common > ath 15289 2 ath9k,ath9k_hw > ..... > cfg80211 141299 3 ath9k,mac80211,ath > > Any ideas will be greatly appreciated. I will be happy to test > patches. Please CC me at jon.wikne@xxxxxxx since I am not on > the list. > > > Regards, > -- Jon Wikne > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- thanks, shafi -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
