I've installed kernel 4.5rc1 and the problem vanished.
When I was installing the kernel it complained that it may not be able
to install i915 firmware (I'm not sure if it succeeded).
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1534260
Title:
Ubuntu does not recognized wireless mouse and keyboard after startup
for couple of minutes
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