Ubuntu-3.13.0-5.20
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Trusty)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1270736
Title:
[Trusty Patch] intel_pstate: Add setting voltage value for baytrail P
states
Status in intel:
New
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Trusty:
Fix Released
Bug description:
There's a bug that kernel fails to boot with intel_pstate enabled on
BayTrail-M which said: Problem only occurs on 4 core Pentium CPU. It
appears to be a race condition in the kernel that only happens when
intel_pstate sets the processor to run at it's highest speed early in
the boot process, so not a intel_pstate problem per se, just exposed
by intel_pstate.
This bug is fixed by this patch which is queued for 3.14-rc1 and market for
3.13 stable.
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=007bea098b869945a462420a1f9d442ff169f722
intel_pstate: Add setting voltage value for baytrail P states.
Baytrail requires setting P state and voltage pairs when adjusting the
requested P state. Add function for retrieving the valid voltage
values and modify *_set_pstate() functions to caluclate the
appropriate voltage for the requested P state.
Signed-off-by: Dirk Brandewie <dirk.j.brande...@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Please consider to include this patch in Trusty.
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