The bug just manifested on my
Linux ******** 2.6.24-11-generic #1 SMP Fri Feb 29 22:08:31 UTC 2008 i686 
GNU/Linux
It is not solved.

O remember having this problem for long time - probably from edgy
through feisty, gutsy and now in heron from alpha 1 to last update few
hours ago (alpha 6 I suppose).

I would suggest 2 things to all suffering from this bug:
1, do not use cable to connect your usb dongle, stick it right into usb. This 
way I reduced my wifi problems down to random freeze every few hours (similar 
to original bug text)
2, do not use power button, use ALT SYSRQ keyboard combination: 
http://fosswire.com/2007/09/08/fix-a-frozen-system-with-the-magic-sysrq-keys/

I suspect this bug could be the combination of hardware and software
failure. First something goes wrong with dongle connection, which
unregister it from the usb bus. Then zd1211rw (or kernel) does not
handle this situation correctly. zd1211 continues to try reading from
disconnected dongle and partly hangs the whole usb subsystem.

Is there a way to restart usb subsystem without restarting the whole computer?
What else could be done to investigate this?

Last suggestion (to use zd1211rw-mac80211 which I tested unsuccessfully)
is almost year old. I would love to help to solve it, just give me some
direction what to test.

-- 
usb wireless device zd1211rw 5-2:1.0: zd_chip_control_leds error -19
https://bugs.launchpad.net/bugs/74362
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