Julian,
The yenta_socket kernel module has a module parameter that is worth
trying:
pwr_irqs_off=1
so can you reload the module with this to see if this helps. The module
parameter has the oblique note stating:
"Force IRQs off during power-on of slot. Use only when seeing IRQ
storms!"
which may help, but I am unsure if this is the once-on power on of the
device, or if the device is powered on/off in many times over an
extended period, hence you see the sporadic IRQ storms.
--
Powertop reports huge number of wakeups and drains battery
https://bugs.launchpad.net/bugs/145377
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