Did you happen to have a chance to test the latest mainline kernel,
posted in comment #2?  Mainline is now up to -rc7, so the link to the
kernel would be:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc7-wily/

If the bug is fixed in mainline, we can perform a reverse bisect to
identify the commit that fixes it.

However, if the bug still exists in mainline, we would want to perform a
regular kernel bisect to find the commit that introduced the regression.
To perform a bisect, we need to identify the last good and first bad
kernel versions.  Per comment #7 v3.16 is good, but v3.19 is bad.  We
would want to test the versions in between.  So if mainline still has
the bug, can you test the following upstream kernels:

v3.17: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-utopic/
v3.18: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-vivid/

Once we have these results, we can narrow down the versions further to
individual release candidates.

Thanks in advance!





** Tags added: performing-bisect

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https://bugs.launchpad.net/bugs/1571798

Title:
  Broadwell ECRC Support missing in Ubuntu

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