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    Subject[2.6.31-rc1] iwlagn (4965): no wireless due to RFKILL problem
    Date
    I've tried .31-rc1 on my HP 2510p notebook and the only problem I found 
    was that wireless no longer works. The cause looks to be related to
    RFKILL.

    Initially when I booted all I got in dmesg was:
    cfg80211: Using static regulatory domain info
    cfg80211: Regulatory domain: EU
    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
    (2402000 KHz - 2482000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (5490000 KHz - 5710000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
    cfg80211: Calling CRDA for country: EU
    iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27kd
    iwlagn: Copyright(c) 2003-2009 Intel Corporation
    iwlagn 0000:10:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    iwlagn 0000:10:00.0: setting latency timer to 64
    iwlagn 0000:10:00.0: Detected Intel Wireless WiFi Link 4965AGN REV=0x4
    iwlagn 0000:10:00.0: Tunable channels: 11 802.11bg, 13 802.11a channels
    iwlagn 0000:10:00.0: irq 27 for MSI/MSI-X
    phy0: Selected rate control algorithm 'iwl-agn-rs'

    Normally I'd expect to see the following after that (from .30):
    iwlagn 0000:10:00.0: firmware: requesting iwlwifi-4965-2.ucode
    iwlagn 0000:10:00.0: loaded firmware version 228.57.2.23
    Registered led device: iwl-phy0::radio
    Registered led device: iwl-phy0::assoc
    Registered led device: iwl-phy0::RX
    Registered led device: iwl-phy0::TX
    wlan0: authenticate with AP 00:14:c1:38:e5:15
    wlan0: authenticated
    wlan0: associate with AP 00:14:c1:38:e5:15
    wlan0: RX AssocResp from 00:14:c1:38:e5:15 (capab=0x411 status=0 aid=1)
    wlan0: associated

    So it did not even try to load the firmware...


    After the boot completed I tried unloading and reloading iwlagn, and then
    I suddenly got:
    iwlagn 0000:10:00.0: PCI INT A disabled
    cfg80211: Using static regulatory domain info
    cfg80211: Regulatory domain: EU
    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
    (2402000 KHz - 2482000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
    (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (5490000 KHz - 5710000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
    cfg80211: Calling CRDA for country: EU
    iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27kd
    iwlagn: Copyright(c) 2003-2009 Intel Corporation
    iwlagn 0000:10:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    iwlagn 0000:10:00.0: setting latency timer to 64
    iwlagn 0000:10:00.0: Detected Intel Wireless WiFi Link 4965AGN REV=0x4
    iwlagn 0000:10:00.0: Tunable channels: 11 802.11bg, 13 802.11a channels
    iwlagn 0000:10:00.0: irq 27 for MSI/MSI-X
    phy0: Selected rate control algorithm 'iwl-agn-rs'
    iwlagn 0000:10:00.0: firmware: requesting iwlwifi-4965-2.ucode
    iwlagn 0000:10:00.0: loaded firmware version 228.57.2.23
    iwlagn 0000:10:00.0: Radio disabled by HW RF Kill switch

    I then noticed that the wireless led on the notbook was indeed off, but it
    was totally unresponsive to any attempts to turn it on.

    I also compared loaded modules; for .30:
    cfg80211 65944 3 iwlagn,iwlcore,mac80211
    iwlagn 113236 0
    iwlcore 159172 1 iwlagn
    led_class 5080 3 iwlcore,hp_accel,sdhci
    lib80211 7520 1 iwlcore
    mac80211 164744 2 iwlagn,iwlcore
    rfkill 12276 5 hp_wmi,iwlcore
    and for .31-rc1:
    cfg80211 90808 3 iwlagn,iwlcore,mac80211
    iwlagn 107856 0
    iwlcore 167908 1 iwlagn
    led_class 5064 3 iwlcore,hp_accel,sdhci
    mac80211 167024 2 iwlagn,iwlcore
    rfkill 20640 2 hp_wmi,cfg80211

    Note that lib80211 no longer gets loaded.

    After rebooting into .30 wireless worked again.

    Cheers,
    FJP

    Relevant part of config (diff between .30 and .31-rc1):
    CONFIG_WIRELESS=y
    CONFIG_CFG80211=m
    # CONFIG_CFG80211_REG_DEBUG is not set
    +# CONFIG_CFG80211_DEBUGFS is not set
    CONFIG_WIRELESS_OLD_REGULATORY=y
    CONFIG_WIRELESS_EXT=y
    CONFIG_WIRELESS_EXT_SYSFS=y
    CONFIG_LIB80211=m
    # CONFIG_LIB80211_DEBUG is not set
    CONFIG_MAC80211=m
    +# CONFIG_MAC80211_DEFAULT_PS is not set
    +CONFIG_MAC80211_DEFAULT_PS_VALUE=1

    #
    # Rate control algorithm selection
    #
    CONFIG_MAC80211_RC_MINSTREL=y
    # CONFIG_MAC80211_RC_DEFAULT_PID is not set
    CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y
    CONFIG_MAC80211_RC_DEFAULT="minstrel"
    CONFIG_MAC80211_MESH=y
    CONFIG_MAC80211_LEDS=y
    # CONFIG_MAC80211_DEBUGFS is not set
    # CONFIG_MAC80211_DEBUG_MENU is not set
    # CONFIG_WIMAX is not set
    CONFIG_RFKILL=m
    -CONFIG_RFKILL_INPUT=m
    CONFIG_RFKILL_LEDS=y
    +CONFIG_RFKILL_INPUT=y
    # CONFIG_NET_9P is not set
    [...]
    CONFIG_IWLWIFI=m
    CONFIG_IWLWIFI_LEDS=y
    -CONFIG_IWLWIFI_RFKILL=y
    # CONFIG_IWLWIFI_SPECTRUM_MEASUREMENT is not set
    CONFIG_IWLWIFI_DEBUG=y
    CONFIG_IWLAGN=m
    CONFIG_IWL4965=y
    # CONFIG_IWL5000 is not set
    # CONFIG_IWL3945 is not set
    # CONFIG_HOSTAP is not set
    # CONFIG_B43 is not set
    # CONFIG_B43LEGACY is not set
    # CONFIG_ZD1211RW is not set
    # CONFIG_RT2X00 is not set
    # CONFIG_HERMES is not set
    +# CONFIG_IWM is not set


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