Comment 12 for bug 938509

I tested with upstream kernel 3.4.0 (uname -a says "Linux armonica 3.4.0-030400-generic #201205210521 SMP Mon May 21 09:22:02 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux", the .debs I downloaded from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/ were linux-image-3.4.0-030400-generic_3.4.0-030400.201205210521_amd64.deb, linux-headers-3.4.0-030400-generic_3.4.0-030400.201205210521_amd64.deb, and linux-headers-3.4.0-030400_3.4.0-030400.201205210521_all.deb) and the issue persisted.

I have a 5Ghz network (broadcasting SSID) that my MacBook Air can see and connect to just fine. The machine with ubuntu precise can neither see nor connect to this network.

Interestingly (?) even though "iw reg get" tells me:

$ iw reg get
country 00:
        (2402 - 2472 @ 40), (3, 20)
        (2457 - 2482 @ 20), (3, 20), PASSIVE-SCAN, NO-IBSS
        (2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
        (5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
        (5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS

iw list only shows frequences in the 2.4Ghz range:

$iw list
Wiphy phy0
        Band 1:
                Capabilities: 0x11ce
                        HT20/HT40
                        SM Power Save disabled
                        RX HT40 SGI
                        TX STBC
                        RX STBC 1-stream
                        Max AMSDU length: 3839 bytes
                        DSSS/CCK HT40
                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
                Minimum RX AMPDU time spacing: 8 usec (0x06)
                HT TX/RX MCS rate indexes supported: 0-7
                Frequencies:
                        * 2412 MHz [1] (14.0 dBm)
                        * 2417 MHz [2] (15.0 dBm)
                        * 2422 MHz [3] (15.0 dBm)
                        * 2427 MHz [4] (15.0 dBm)
                        * 2432 MHz [5] (15.0 dBm)
                        * 2437 MHz [6] (15.0 dBm)
                        * 2442 MHz [7] (15.0 dBm)
                        * 2447 MHz [8] (15.0 dBm)
                        * 2452 MHz [9] (15.0 dBm)
                        * 2457 MHz [10] (15.0 dBm)
                        * 2462 MHz [11] (15.0 dBm)
                        * 2467 MHz [12] (15.0 dBm) (passive scanning)
                        * 2472 MHz [13] (14.0 dBm) (passive scanning)
                        * 2484 MHz [14] (17.0 dBm) (passive scanning)
                Bitrates (non-HT):
                        * 1.0 Mbps
                        * 2.0 Mbps (short preamble supported)
                        * 5.5 Mbps (short preamble supported)
                        * 11.0 Mbps (short preamble supported)
                        * 6.0 Mbps
                        * 9.0 Mbps
                        * 12.0 Mbps
                        * 18.0 Mbps
                        * 24.0 Mbps
                        * 36.0 Mbps
                        * 48.0 Mbps
                        * 54.0 Mbps
        max # scan SSIDs: 4
        max scan IEs length: 2257 bytes
        Coverage class: 0 (up to 0m)
        Supported Ciphers:
                * WEP40 (00-0f-ac:1)
                * WEP104 (00-0f-ac:5)
                * TKIP (00-0f-ac:2)
                * CCMP (00-0f-ac:4)
                * CMAC (00-0f-ac:6)
        Available Antennas: TX 0x1 RX 0x3
        Configured Antennas: TX 0x1 RX 0x3
        Supported interface modes:
                 * IBSS
                 * managed
                 * AP
                 * AP/VLAN
                 * WDS
                 * monitor
                 * mesh point
                 * P2P-client
                 * P2P-GO
        software interface modes (can always be added):
                 * AP/VLAN
                 * monitor
        interface combinations are not supported
        Supported commands:
                 * new_interface
Wiphy phy0
        Band 1:
                Capabilities: 0x11ce
                        HT20/HT40
                        SM Power Save disabled
                        RX HT40 SGI
                        TX STBC
                        RX STBC 1-stream
                        Max AMSDU length: 3839 bytes
                        DSSS/CCK HT40
                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
                Minimum RX AMPDU time spacing: 8 usec (0x06)
                HT TX/RX MCS rate indexes supported: 0-7
                Frequencies:
                        * 2412 MHz [1] (14.0 dBm)
                        * 2417 MHz [2] (15.0 dBm)
                        * 2422 MHz [3] (15.0 dBm)
                 * set_interface
                 * new_key
                 * new_beacon
                 * new_station
                 * new_mpath
                 * set_mesh_params
                 * set_bss
                 * authenticate
                 * associate
                 * deauthenticate
                 * disassociate
                 * join_ibss
                 * join_mesh
                 * remain_on_channel
                 * set_tx_bitrate_mask
                 * action
                 * frame_wait_cancel
                 * set_wiphy_netns
                 * set_channel
                 * set_wds_peer
                 * Unknown command (82)
                 * Unknown command (81)
                 * Unknown command (84)
                 * Unknown command (87)
                 * Unknown command (85)
                 * testmode
                 * connect
                 * disconnect
        Supported TX frame types:
                 * IBSS: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * managed: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * AP: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * AP/VLAN: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * mesh point: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * P2P-client: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
                 * P2P-GO: 0x0000 0x0010 0x0020 0x0030 0x0040 0x0050 0x0060 0x0070 0x0080 0x0090 0x00a0 0x00b0 0x00c0 0x00d0 0x00e0 0x00f0
        Supported RX frame types:
                 * IBSS: 0x00d0
                 * managed: 0x0040 0x00d0
                 * AP: 0x0000 0x0020 0x0040 0x00a0 0x00b0 0x00c0 0x00d0
                 * AP/VLAN: 0x0000 0x0020 0x0040 0x00a0 0x00b0 0x00c0 0x00d0
                 * mesh point: 0x00b0 0x00c0 0x00d0
                 * P2P-client: 0x0040 0x00d0
                 * P2P-GO: 0x0000 0x0020 0x0040 0x00a0 0x00b0 0x00c0 0x00d0
        Device supports RSN-IBSS.