I am experiencing a problem with a USB dongle for a computer, so that I can get WiFi access on my home network. The device works at boot, until it doesn't. No idea what is causing it. Here is dmesg. Note that the last two messages are from when I physically detached the device form my computer:
$ dmesg | grep urtwn
[ 2.313298] urtwn0 at uhub3 port 1
[ 2.313298] urtwn0: Realtek (0x2357) 802.11n NIC (0x0109), rev 2.10/2.00, addr 1
[ 2.503297] urtwn0: MAC/BB RTL8192EU, RF 6052 2T2R, address 7c:c2:c6:11:c1:e6
[ 2.503297] urtwn0: 1 rx pipe, 3 tx pipes
[ 222.503517] urtwn0: device timeout
[ 223.153519] urtwn0: transmit failed, TIMEOUT
[ 227.503523] urtwn0: device timeout
[ 228.153523] urtwn0: transmit failed, TIMEOUT
[ 233.503530] urtwn0: device timeout
[ 234.153530] urtwn0: transmit failed, TIMEOUT
[ 239.503536] urtwn0: device timeout
[ 240.153536] urtwn0: transmit failed, TIMEOUT
[ 248.503545] urtwn0: device timeout
[ 249.153546] urtwn0: transmit failed, TIMEOUT
[ 275.503572] urtwn0: device timeout
[ 276.153572] urtwn0: transmit failed, TIMEOUT
[ 335.503633] urtwn0: device timeout
[ 336.153633] urtwn0: transmit failed, TIMEOUT
[ 390.503688] urtwn0: device timeout
[ 390.903689] urtwn0: transmit failed, TIMEOUT
[ 2.315813] urtwn0 at uhub3 port 1
[ 2.315813] urtwn0: Realtek (0x2357) 802.11n NIC (0x0109), rev 2.10/2.00, addr 1
[ 2.505812] urtwn0: MAC/BB RTL8192EU, RF 6052 2T2R, address 7c:c2:c6:11:c1:e6
[ 2.505812] urtwn0: 1 rx pipe, 3 tx pipes
[ 790.460607] urtwn0: transmit failed, TIMEOUT
[ 795.500575] urtwn0: device timeout
[ 795.590574] urtwn0: transmit failed, TIMEOUT
[ 800.500544] urtwn0: device timeout
[ 800.790541] urtwn0: transmit failed, TIMEOUT
[ 805.500511] urtwn0: device timeout
[ 806.270505] urtwn0: transmit failed, TIMEOUT
[ 810.500480] urtwn0: device timeout
[ 811.380472] urtwn0: transmit failed, TIMEOUT
[ 816.500438] urtwn0: device timeout
[ 817.210436] urtwn0: transmit failed, TIMEOUT
[ 822.500399] urtwn0: device timeout
[ 823.110397] urtwn0: transmit failed, TIMEOUT
[ 828.500359] urtwn0: device timeout
[ 828.850357] urtwn0: transmit failed, TIMEOUT
[ 840.500280] urtwn0: device timeout
[ 841.110275] urtwn0: transmit failed, TIMEOUT
[ 867.500102] urtwn0: device timeout
[ 868.110098] urtwn0: transmit failed, TIMEOUT
[ 900.499885] urtwn0: device timeout
[ 901.179880] urtwn0: transmit failed, TIMEOUT
[ 906.499845] urtwn0: device timeout
[ 907.179842] urtwn0: transmit failed, TIMEOUT
[ 915.499785] urtwn0: device timeout
[ 916.179781] urtwn0: transmit failed, TIMEOUT
[ 934.499660] urtwn0: device timeout
[ 934.589660] urtwn0: transmit failed, TIMEOUT
[ 951.499548] urtwn0: device timeout
[ 951.609548] urtwn0: transmit failed, TIMEOUT
[ 957.499509] urtwn0: device timeout
[ 957.609508] urtwn0: transmit failed, TIMEOUT
[ 966.499450] urtwn0: device timeout
[ 966.609449] urtwn0: transmit failed, TIMEOUT
[ 970.329425] urtwn0: detached
[ 970.329425] urtwn0: at uhub3 port 1 (addr 1) disconnected
Any ideas what is going on?