Not working wifi on Ubuntu 11.04

[HhyperR]

Binary package hint: network-manager

After upgrading 10.10 to stable 11.04, wifi is stop working. When checking "wireless connection" in nm applet - nothing happens, even in syslogs. I'm tried booting with previous 2.6.35-29-generic kernel, wich was working, but all the same. And I already tried to compile modules from http://linuxwireless.org with no result. But it works when I manually initialize connection with such script:

wpa_supplicant -iwlan0 -c/home/val/wpa_supplicant.conf -B
sleep 2
route add default dev wlan0
dhclient wlan0

Laptop is Acer Aspire 1551. Output of lspci -vv:

06:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
 Subsystem: Foxconn International, Inc. Device e01f
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 32 bytes
 Interrupt: pin A routed to IRQ 17
 Region 0: Memory at d0300000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: ath9k
 Kernel modules: ath9k

When I manually bring interface "ifconfig wlan0 up" there is output in syslog:
Apr 29 13:35:11 val kernel: [13459.158797] ADDRCONF(NETDEV_UP): wlan0: link is not ready
And "iwlist scan" found my network correctly.

There is output of "rfkill list" on fresh reboot:

0: acer-wireless: Wireless LAN
 Soft blocked: yes
 Hard blocked: no
1: acer-bluetooth: Bluetooth
 Soft blocked: yes
 Hard blocked: no
5: phy2: Wireless LAN
 Soft blocked: no
 Hard blocked: no
6: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

Fn-F2 key not working too (already submited), and I tried rfkill unblock 0 (5, wifi, all). This is output of syslog:

Apr 29 13:47:19 val NetworkManager[952]: <info> WiFi now enabled by radio killswitch
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): bringing up device.
Apr 29 13:47:19 val kernel: [14187.153313] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): supplicant interface state: starting -> ready
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): device state change: 2 -> 3 (reason 42)
Apr 29 13:47:19 val NetworkManager[952]: <info> WiFi now disabled by radio killswitch
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): device state change: 3 -> 2 (reason 0)
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): deactivating device (reason: 0).
Apr 29 13:47:19 val NetworkManager[952]: <info> (wlan0): taking down device.

And sometimes with additional errors:

Apr 29 13:46:15 val NetworkManager[952]: <info> WiFi now enabled by radio killswitch
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): bringing up device.
Apr 29 13:46:15 val kernel: [14123.283533] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): supplicant interface state: starting -> ready
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): device state change: 2 -> 3 (reason 42)
Apr 29 13:46:15 val wpa_supplicant[1119]: Failed to initiate AP scan.
Apr 29 13:46:15 val NetworkManager[952]: <info> WiFi now disabled by radio killswitch
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): device state change: 3 -> 2 (reason 0)
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): deactivating device (reason: 0).
Apr 29 13:46:15 val NetworkManager[952]: <info> (wlan0): taking down device.

Apr 29 13:48:35 val NetworkManager[952]: <info> WiFi now enabled by radio killswitch
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): bringing up device.
Apr 29 13:48:35 val NetworkManager[952]: (nm-device-wifi.c:3785):real_set_enabled: runtime check failed: (priv->supplicant.iface == NULL)
Apr 29 13:48:35 val kernel: [14263.722029] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 29 13:48:35 val kernel: [14263.876903] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): supplicant interface state: starting -> ready
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): device state change: 2 -> 3 (reason 42)
Apr 29 13:48:35 val wpa_supplicant[1119]: Failed to initiate AP scan.
Apr 29 13:48:35 val NetworkManager[952]: <info> WiFi now disabled by radio killswitch
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): device state change: 3 -> 2 (reason 0)
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): deactivating device (reason: 0).
Apr 29 13:48:35 val NetworkManager[952]: <info> (wlan0): taking down device.

[W.McL (w-mcl)]

manually disabling the killswitch with `sudo rfkill unblock wifi` leads to the device being unblocked, but it is softblocked again instantly thereafter by radio killswitch. The wifi Fn-Key is not recognized and therefore triggers no action.

However, with an infinite loop that constantly unblocks the device, I achieved some sort of (messy) workaround, that gave me a (very unstable) wireless connection, so I am able to post this comment:

sudo `while true; do echo 0 > /sys/class/rfkill/rfkill1/soft; done`

[W.McL (w-mcl)]

Seems to be related to this bug, the fix posted there (blacklist module 'acer_wmi' fixed the Issue for me.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/771758

[Mathieu Trudel-Lapierre (cyphermox)]

Setting this bug as a duplicate of bug 771758