I've been following these freeze issues since kernel 4.2. cstate is no
longer as effective since 4.6-rc7+ and 4.5.4+.
The known relevant commits are (from bugzilla #109051):
Freezing started after 3.16.7 with commit
31685c258e0b0ad6aa486c5ec001382cf8a64212
freezing worsened again between 4.1 and 4.2 with commit
8fb55197e64d5988ec57b54e973daeea72c3f2ff
Reverting these commits in later kernels does not solve the problem. But for
some users, it extends run time before the next freeze, sometimes
substantially. intel_idle.max_cstate={0,1} has helped the most users the most,
but it is a just a bandaid, not always effective.
The most recent kernels have rendered the ..cstate argument ineffective.
Other improvements in the kernel have reduced my freeze rate from < 30
minutes to about 10 hours. At those rates, it could take a month to
bisect.
Freezing only seems to occur on Intel processors (atom and later). The
freeze rates vary widely from minutes to weeks. It has dependencies on
the particular Intel processor & revision, the hardware platform and the
kernel version. Linux distro does not seem to matter much. I have
experienced freezes with Ubuntu, Mint, Manjaro, and Android_x86 on
multiple platforms (Asus T100CHI & 2 Dell laptops) For me, cstate worked
to prevent freezes until very recent kernels.
As an intermittent problem, most freeze reports have been dismissed with
"It's not in my arena". I believe this a cluster of problems requiring
concurrent fixes. I'm not sure what Ubuntu can do to solve what seems
to be obvious upstream kernel problems.
Maybe Canonical can exert some influence on kernel.org to work on these
freezes rather than breaking features that work while they push the
bleeding edge outward. Many thousands of systems are affected, some of
which belong to IT professions who influence equipment purchase and
configuration for large corporations. An 18 month old fatal bug is a PR
disaster waiting to happen. By fatal I mean that the freeze can
irreparably corrupt an installed system (and I've had to re-install
twice so far.)
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https://bugs.launchpad.net/bugs/1503731
Title:
8086:0f31 Ubuntu 15.04-15.10 freezes totally
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