Here are the latest lines of the dmesg output:
[ 25.388417] cfg80211: Calling CRDA to update world regulatory domain
[ 25.722207] cfg80211: World regulatory domain updated:
[ 25.722219] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 25.722230] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 25.722239] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 25.722248] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 25.722258] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 25.722266] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 25.971659] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 25.971779] HDA Intel 0000:00:1b.0: irq 45 for MSI/MSI-X
[ 25.971838] HDA Intel 0000:00:1b.0: setting latency timer to 64
[ 26.036405] rt2800pci 0000:01:00.0: enabling device (0000 -> 0002)
[ 26.036425] rt2800pci 0000:01:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 26.036449] rt2800pci 0000:01:00.0: setting latency timer to 64
[ 26.047801] cfg80211: Updating information on frequency 2412 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047815] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047824] cfg80211: Updating information on frequency 2417 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047833] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047842] cfg80211: Updating information on frequency 2422 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047852] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047860] cfg80211: Updating information on frequency 2427 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047870] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047879] cfg80211: Updating information on frequency 2432 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047888] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047897] cfg80211: Updating information on frequency 2437 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047907] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047915] cfg80211: Updating information on frequency 2442 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047925] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047933] cfg80211: Updating information on frequency 2447 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047942] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047950] cfg80211: Updating information on frequency 2452 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047960] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047968] cfg80211: Updating information on frequency 2457 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047978] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.047986] cfg80211: Updating information on frequency 2462 MHz for a 20 MHz width channel with regulatory rule:
[ 26.047996] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.048057] cfg80211: Updating information on frequency 2467 MHz for a 20 MHz width channel with regulatory rule:
[ 26.048068] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.048077] cfg80211: Updating information on frequency 2472 MHz for a 20 MHz width channel with regulatory rule:
[ 26.048087] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.048095] cfg80211: Updating information on frequency 2484 MHz for a 20 MHz width channel with regulatory rule:
[ 26.048105] cfg80211: 2474000 KHz - 2494000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 26.074949] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 26.079273] Registered led device: rt2800pci-phy0::radio
[ 26.079618] Registered led device: rt2800pci-phy0::assoc
[ 26.080174] Registered led device: rt2800pci-phy0::quality
[ 26.084542] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
[ 26.085459] rt2860sta: module is from the staging directory, the quality is unknown, you have been warned.
[ 26.085668] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[ 26.087754] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 26.087770] i915 0000:00:02.0: setting latency timer to 64
[ 26.149390] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[ 26.149400] [drm] Driver supports precise vblank timestamp query.
[ 26.252085] composite sync not supported
[ 26.252876] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 26.253308] [drm] initialized overlay support
[ 26.444827] phy0 -> rt2800pci_mcu_status: Error - MCU request failed, no response from hardware
[ 26.471739] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 26.509635] composite sync not supported
[ 26.534956] Console: switching to colour frame buffer device 128x37
[ 26.535039] fb0: inteldrmfb frame buffer device
[ 26.535045] drm: registered panic notifier
[ 26.535503] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[ 26.784600] composite sync not supported
[ 26.901785] ppdev: user-space parallel port driver
[ 27.326317] composite sync not supported
[ 27.335320] cfg80211: Found new beacon on frequency: 2467 MHz (Ch 12) on phy0
[ 27.356406] composite sync not supported
[ 31.123414] composite sync not supported
[ 31.160301] composite sync not supported
[ 31.195079] composite sync not supported
[ 31.226715] composite sync not supported
[ 31.837040] composite sync not supported
[ 33.810939] EXT4-fs (sda6): re-mounted. Opts: errors=remount-ro,commit=600
[ 36.484371] composite sync not supported
[ 38.521075] composite sync not supported
[ 39.743701] EXT4-fs (sda6): re-mounted. Opts: errors=remount-ro,commit=600
[ 58.565238] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 1)
[ 58.569661] wlan0: authenticated
[ 58.584576] wlan0: associate with 00:1a:2b:2b:5c:72 (try 1)
[ 58.587607] wlan0: RX AssocResp from 00:1a:2b:2b:5c:72 (capab=0x411 status=0 aid=1)
[ 58.587619] wlan0: associated
[ 58.589728] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 69.448043] wlan0: no IPv6 routers present
[ 76.826544] wlan0: deauthenticated from 00:1a:2b:2b:5c:72 (Reason: 7)
[ 76.856260] cfg80211: All devices are disconnected, going to restore regulatory settings
[ 76.856274] cfg80211: Restoring regulatory settings
[ 76.856289] cfg80211: Calling CRDA to update world regulatory domain
[ 76.873110] cfg80211: Updating information on frequency 2412 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873125] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873136] cfg80211: Updating information on frequency 2417 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873146] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873156] cfg80211: Updating information on frequency 2422 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873166] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873176] cfg80211: Updating information on frequency 2427 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873186] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873196] cfg80211: Updating information on frequency 2432 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873206] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873216] cfg80211: Updating information on frequency 2437 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873226] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873236] cfg80211: Updating information on frequency 2442 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873246] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873255] cfg80211: Updating information on frequency 2447 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873266] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873275] cfg80211: Updating information on frequency 2452 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873286] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873295] cfg80211: Updating information on frequency 2457 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873306] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873316] cfg80211: Updating information on frequency 2462 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873326] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873336] cfg80211: Updating information on frequency 2467 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873346] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873356] cfg80211: Updating information on frequency 2472 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873366] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873376] cfg80211: Updating information on frequency 2484 MHz for a 20 MHz width channel with regulatory rule:
[ 76.873386] cfg80211: 2474000 KHz - 2494000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 76.873397] cfg80211: World regulatory domain updated:
[ 76.873403] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 76.873414] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 76.873424] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 76.873434] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 76.873444] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 76.873454] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 78.101170] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 1)
[ 78.104754] wlan0: authenticated
[ 78.105207] wlan0: associate with 00:1a:2b:2b:5c:72 (try 1)
[ 78.107939] wlan0: RX AssocResp from 00:1a:2b:2b:5c:72 (capab=0x411 status=0 aid=1)
[ 78.107951] wlan0: associated
[ 136.821918] wlan0: deauthenticated from 00:1a:2b:2b:5c:72 (Reason: 7)
[ 136.856299] cfg80211: All devices are disconnected, going to restore regulatory settings
[ 136.856320] cfg80211: Restoring regulatory settings
[ 136.856337] cfg80211: Calling CRDA to update world regulatory domain
[ 136.872790] cfg80211: Updating information on frequency 2412 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872806] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872818] cfg80211: Updating information on frequency 2417 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872829] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872840] cfg80211: Updating information on frequency 2422 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872851] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872861] cfg80211: Updating information on frequency 2427 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872873] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872883] cfg80211: Updating information on frequency 2432 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872894] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872904] cfg80211: Updating information on frequency 2437 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872916] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872926] cfg80211: Updating information on frequency 2442 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872938] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872948] cfg80211: Updating information on frequency 2447 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872959] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872969] cfg80211: Updating information on frequency 2452 MHz for a 20 MHz width channel with regulatory rule:
[ 136.872981] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.872991] cfg80211: Updating information on frequency 2457 MHz for a 20 MHz width channel with regulatory rule:
[ 136.873002] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.873012] cfg80211: Updating information on frequency 2462 MHz for a 20 MHz width channel with regulatory rule:
[ 136.873024] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.873034] cfg80211: Updating information on frequency 2467 MHz for a 20 MHz width channel with regulatory rule:
[ 136.873046] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.873056] cfg80211: Updating information on frequency 2472 MHz for a 20 MHz width channel with regulatory rule:
[ 136.873067] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.873077] cfg80211: Updating information on frequency 2484 MHz for a 20 MHz width channel with regulatory rule:
[ 136.873089] cfg80211: 2474000 KHz - 2494000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 136.873101] cfg80211: World regulatory domain updated:
[ 136.873108] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 136.873119] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 136.873131] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 136.873142] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 136.873153] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 136.873164] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 138.093772] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 1)
[ 138.095368] wlan0: authenticated
[ 138.095918] wlan0: associate with 00:1a:2b:2b:5c:72 (try 1)
[ 138.097714] wlan0: RX AssocResp from 00:1a:2b:2b:5c:72 (capab=0x411 status=0 aid=1)
[ 138.097725] wlan0: associated
[ 148.506162] wlan0: deauthenticating from 00:1a:2b:2b:5c:72 by local choice (reason=3)
[ 148.548466] cfg80211: All devices are disconnected, going to restore regulatory settings
[ 148.548481] cfg80211: Restoring regulatory settings
[ 148.548513] cfg80211: Calling CRDA to update world regulatory domain
[ 148.561416] cfg80211: Updating information on frequency 2412 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561426] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561433] cfg80211: Updating information on frequency 2417 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561440] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561446] cfg80211: Updating information on frequency 2422 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561453] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561459] cfg80211: Updating information on frequency 2427 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561466] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561472] cfg80211: Updating information on frequency 2432 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561479] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561485] cfg80211: Updating information on frequency 2437 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561492] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561498] cfg80211: Updating information on frequency 2442 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561505] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561511] cfg80211: Updating information on frequency 2447 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561518] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561524] cfg80211: Updating information on frequency 2452 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561531] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561537] cfg80211: Updating information on frequency 2457 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561544] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561550] cfg80211: Updating information on frequency 2462 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561557] cfg80211: 2402000 KHz - 2472000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561563] cfg80211: Updating information on frequency 2467 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561570] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561576] cfg80211: Updating information on frequency 2472 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561583] cfg80211: 2457000 KHz - 2482000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561589] cfg80211: Updating information on frequency 2484 MHz for a 20 MHz width channel with regulatory rule:
[ 148.561596] cfg80211: 2474000 KHz - 2494000 KHz @ KHz), (300 mBi, 2000 mBm)
[ 148.561603] cfg80211: World regulatory domain updated:
[ 148.561608] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[ 148.561615] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 148.561621] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 148.561628] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 148.561635] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 148.561641] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 151.320851] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 1)
[ 151.520082] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 2)
[ 151.720084] wlan0: authenticate with 00:1a:2b:2b:5c:72 (try 3)
[ 151.920084] wlan0: authentication with 00:1a:2b:2b:5c:72 timed out
dmesgcommand to get some more information about what is happening. dmesg shows the entire kernel log, so you are only interested in the last few lines of the output during the time the connection is failing. – user1974 May 31 '11 at 14:47