More information.
I have narrowed it down:
16.04.1 - kernel 4.4.0-31-generic
==> Works OK with messages ("encoder detached but still enabled on pipe A.")
No visible slowdown apart for 3 or 4 stack traces in the log.
16.04.2 - kernel 4.8.0-36-generic
==> Shows the "time outs" bug
So there must have been a change that is affecting i915 between kernels 4.4.
and 4.8
Steps to reproduce:
- live boot on 16.04.1
- see all is Ok apart from some messages in the log
- live boot on 16.04.2
- see the boot takes much much more time and there are numerous timeouts
messages.
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https://bugs.launchpad.net/bugs/1731784
Title:
system slow to start, kernel trace on Inspiron 1525
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