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Thread: Wifi disconnects ONLY at school

  1. #1
    Join Date
    Nov 2012
    Beans
    12

    Wifi disconnects ONLY at school

    Hello everybody,

    After installing Ubuntu on my computer I had problems with wifi it disconnected from networks in an aleatory way. Then Wild Man helped me and now I have no problems with connection at home or at my friends.
    Now the problem is that at school it disconnects me quite regularly. When it disconnects me it doesn't see any wireless network (which is impossible we have four of them), and then tries to reconnect me and succeed. And after five minutes it's the same scenario.
    The signal of the wifi is strong enough pretty much everywhere

    sudo watch -n 10 iwlist wlan0 scan :

    Code:
    wlan0     Scan completed :
              Cell 01 - Address: 28:93:FE:4E:0F:90
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=57/70  Signal level=-53 dBm
                        Encryption key:on
                        ESSID:"epfl"
                        Bit Rates:6 Mb/s; 9 Mb/s; 11 Mb/s; 12 Mb/s; 18 Mb/s
                                  24 Mb/s; 36 Mb/s; 48 Mb/s
                        Bit Rates:54 Mb/s
                        Mode:Master
                        Extra:tsf=0000000af1356824
                        Extra: Last beacon: 3104ms ago
                        IE: Unknown: 00046570666C
                        IE: Unknown: 01080C12169824304860
                        IE: Unknown: 030106
                        IE: Unknown: 0706434820010D14
                        IE: Unknown: 0B050D001E8D5B
                        IE: Unknown: 2A0100
                        IE: IEEE 802.11i/WPA2 Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (1) : CCMP
                            Authentication Suites (1) : 802.1x
                        IE: Unknown: 32016C
                        IE: Unknown: 9606004096000500
                        IE: WPA Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (1) : TKIP
                            Authentication Suites (1) : 802.1x
                        IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                        IE: Unknown: DD06004096010104
                        IE: Unknown: DD050040960305
                        IE: Unknown: DD050040960B09
                        IE: Unknown: DD050040961401
    lspci -v :

    Code:
    00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0
        Capabilities: <access denied>
        Kernel driver in use: agpgart-intel
    
    00:01.0 PCI bridge: Intel Corporation Ivy Bridge PCI Express Root Port (rev 09) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=06, sec-latency=0
        I/O behind bridge: 00003000-00003fff
        Memory behind bridge: d0000000-d1ffffff
        Prefetchable memory behind bridge: 00000000a0000000-00000000bfffffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport
        Kernel modules: shpchp
    
    00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 44
        Memory at d2000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 4000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915
    
    00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI])
        Subsystem: Dell Device 0552
        Flags: bus master, medium devsel, latency 0, IRQ 42
        Memory at d2700000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd
    
    00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 43
        Memory at d2714000 (64-bit, non-prefetchable) [size=16]
        Capabilities: <access denied>
        Kernel driver in use: mei
        Kernel modules: mei
    
    00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04) (prog-if 20 [EHCI])
        Subsystem: Dell Device 0552
        Flags: bus master, medium devsel, latency 0, IRQ 16
        Memory at d2719000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: <access denied>
        Kernel driver in use: ehci_hcd
    
    00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at d2710000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd-hda-intel
    
    00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=07, subordinate=07, sec-latency=0
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: d2600000-d26fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport
        Kernel modules: shpchp
    
    00:1c.2 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 3 (rev c4) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=08, subordinate=08, sec-latency=0
        Memory behind bridge: d2500000-d25fffff
        Prefetchable memory behind bridge: 000000009fb00000-000000009fbfffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport
        Kernel modules: shpchp
    
    00:1c.3 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 4 (rev c4) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=09, subordinate=09, sec-latency=0
        Memory behind bridge: d2400000-d24fffff
        Capabilities: <access denied>
        Kernel driver in use: pcieport
        Kernel modules: shpchp
    
    00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04) (prog-if 20 [EHCI])
        Subsystem: Dell Device 0552
        Flags: bus master, medium devsel, latency 0, IRQ 23
        Memory at d2718000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: <access denied>
        Kernel driver in use: ehci_hcd
    
    00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
        Subsystem: Dell Device 0552
        Flags: bus master, medium devsel, latency 0
        Capabilities: <access denied>
        Kernel modules: iTCO_wdt
    
    00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0])
        Subsystem: Dell Device 0552
        Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 41
        I/O ports at 4088 [size=8]
        I/O ports at 4094 [size=4]
        I/O ports at 4080 [size=8]
        I/O ports at 4090 [size=4]
        I/O ports at 4060 [size=32]
        Memory at d2717000 (32-bit, non-prefetchable) [size=2K]
        Capabilities: <access denied>
        Kernel driver in use: ahci
    
    00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
        Subsystem: Dell Device 0552
        Flags: medium devsel, IRQ 10
        Memory at d2715000 (64-bit, non-prefetchable) [size=256]
        I/O ports at 4040 [size=32]
        Kernel modules: i2c-i801
    
    01:00.0 VGA compatible controller: NVIDIA Corporation Device 0fd1 (rev ff) (prog-if ff)
        !!! Unknown header type 7f
    
    01:00.1 Audio device: NVIDIA Corporation Device 0e1b (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: snd_hda_intel
    
    07:00.0 Ethernet controller: Atheros Communications Inc. AR8151 v2.0 Gigabit Ethernet (rev c0)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 46
        Memory at d2600000 (64-bit, non-prefetchable) [size=256K]
        I/O ports at 2000 [size=128]
        Capabilities: <access denied>
        Kernel driver in use: atl1c
        Kernel modules: atl1c
    
    08:00.0 Network controller: Atheros Communications Inc. AR9462 Wireless Network Adapter (rev 01)
        Subsystem: Bigfoot Networks, Inc. Device 2003
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at d2500000 (64-bit, non-prefetchable) [size=512K]
        Expansion ROM at 9fb00000 [disabled] [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: ath9k
        Kernel modules: ath9k
    
    09:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5116 PCI Express Card Reader (rev 01)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 19
        Memory at d2401000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: <access denied>
        Kernel driver in use: rts_pstor
        Kernel modules: rts_pstor
    
    09:00.1 SD Host controller: Realtek Semiconductor Co., Ltd. RTS5116 PCI Express Card Reader (rev 01)
        Subsystem: Dell Device 0552
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at d2400000 (32-bit, non-prefetchable) [size=256]
        Capabilities: <access denied>
        Kernel driver in use: sdhci-pci
        Kernel modules: sdhci-pci
    The only difference I see is that at home I have a WPA encryption and at school a WPA&WPA2 Entreprise encryption.

    So if someone has any ideas, please help.

    Thank you in advance

  2. #2
    Join Date
    Jan 2008
    Location
    Manchester UK
    Beans
    13,635
    Distro
    Ubuntu

    Re: Wifi disconnects ONLY at school

    Thread moved to Networking & Wireless.

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