I have just compiled a custom 3.3.0 kernel for an Acer netbook, previously running 3.0.0, and see
the same problem as reported by Hans. In my case, after 36 hours of uptime with the new kernel, the
ath5k began to report constant "gain calibration timeout" errors and connectivity was lost.
Rebooting with the previous kernel without powering off did not restore wireless connectivity. The
old ath5k was reporting "gain calibration timeout" too. Powering off and on, and booting the old 3.0
kernel seems to have restored correct functionality.
Just to be clear, both kernels are compiled from source from kernel.org, not Debian builds.
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