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README: Add note about IIO kernel bug

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Bastien Nocera
2017-06-12 14:29:52 +02:00
parent b62d57cbef
commit 2cbe0ee33b
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README.md
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@@ -86,6 +86,20 @@ If your device does not contain a compass, you can run tests with:
- As root, get a shell as the `geoclue` user with `su -s /bin/bash geoclue`
- Run, as the `geoclue` user, `monitor-sensor`
Known problems
--------------
Every Linux kernel from 4.3 up to the latest versions (4.12-rc3 at the time of writing) have a bug that
make iio-sensor-proxy fail to see any events coming from sensors until the sensor is unplugged and replugged
or suspended and resumed.
A work-around for this problem was added in [this commit](https://github.com/hadess/iio-sensor-proxy/commit/5468452f7a72566d2e6ddc44f9396d3d088fa9fb)
to minimise the impact of this kernel bug. The bug has been reported but still not root-caused. It's
a race condition and hard to "not reproduce" with certainty, meaning a number of possible of unaffected
kernels work because of different timings.
See also (this linux-iio thread)[https://www.spinics.net/lists/linux-iio/msg29983.html].
References
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