It still stalls, when running via sudo.

an strace -p reveals it's continously doing this:
lock_gettime(CLOCK_MONOTONIC, {15406, 822234541}) = 0
poll([{fd=6, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=6, revents=POLLOUT}])
writev(6, [{">\3\7\0\32\0`\5\21\0`\5\23\0`\5\t\0U\0\t\0U\0\17\1\27\0", 28}, 
{NULL, 0}, {"", 0}], 3) = 28
recv(6, 0x914c338, 4096, 0)             = -1 EAGAIN (Resource temporarily 
unavailable)
poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=6, events=POLLIN}], 3, 
0) = 2 ([{fd=3, revents=POLLIN}, {fd=6, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
recv(6, "\16\0\205-\21\0`\5\0\0>\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 
4096, 0) = 32
recv(6, 0x914c338, 4096, 0)             = -1 EAGAIN (Resource temporarily 
unavailable)
poll([{fd=6, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=6, revents=POLLOUT}])
writev(6, [{"+\3\1\0", 4}, {NULL, 0}, {"", 0}], 3) = 4
poll([{fd=6, events=POLLIN}], 1, -1)    = 1 ([{fd=6, revents=POLLIN}])
recv(6, "\1\1\206-\0\0\0\0\22\0@\4\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 
4096, 0) = 32
recv(6, 0x914c338, 4096, 0)             = -1 EAGAIN (Resource temporarily 
unavailable)
clock_gettime(CLOCK_MONOTONIC, {15406, 825254131}) = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=6, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=6, revents=POLLOUT}])
writev(6, [{">\3\7\0\32\0`\5\21\0`\5\23\0`\5\t\0U\0\t\0U\0\17\1\27\0", 28}, 
{NULL, 0}, {"", 0}], 3) = 28
recv(6, 0x914c338, 4096, 0)             = -1 EAGAIN (Resource temporarily 
unavailable)
gettimeofday({1336723098, 899654}, NULL) = 0
gettimeofday({1336723098, 899797}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 1000})  = 0 (Timeout)
gettimeofday({1336723098, 901111}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 2000})  = 0 (Timeout)
gettimeofday({1336723098, 903401}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 4000})  = 0 (Timeout)
gettimeofday({1336723098, 907722}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 8000})  = 0 (Timeout)
gettimeofday({1336723098, 916292}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 16000}) = 0 (Timeout)
gettimeofday({1336723098, 932808}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 32000}) = 0 (Timeout)
gettimeofday({1336723098, 965376}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 34277}^C <unfinished ...>

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https://bugs.launchpad.net/bugs/997922

Title:
  12.04 unable to search 5Ghz - only uses 2.4ghz - with ar9285

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