@Carl found something interesting:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1672439/comments/39
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https://bugs.launchpad.net/bugs/1674390
Title:
Kernel 4.4.0-67
This bug was fixed in the package linux - 4.4.0-75.96
---
linux (4.4.0-75.96) xenial; urgency=low
* linux: 4.4.0-75.96 -proposed tracker (LP: #1684441)
* [Hyper-V] hv: util: move waiting for release to hv_utils_transport itself
(LP: #1682561)
- Drivers: hv: util: move wai
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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Title:
Kernel 4.4.0-67 Defaults to ACPI-cpufreq
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verifica
My bad.
C-State will be in next release,
P-State is not yet in Xenial's kernel tree.
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Title:
Kernel 4.4.0-67 Defaults to ACPI-cpufre
This fix is not showing up in 4.4.0-70.
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Title:
Kernel 4.4.0-67 Defaults to ACPI-cpufreq rather than P-State - Dell
Precision 5520
Okay. That file exists.
Thanks for the info. Looking forward to seeing these patches arrive in
the next few kernel iterations.
Cheers
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Thanks for your test.
There is a directory 'intel_pstate' under '/sys/devices/system/cpu', it
only exists when pstate driver is in use.
C State for Kabylake will be included in next release after 4.4.0-69.
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Your kernel does not have cpupower but according to tlp -p, the test
kernel is now using pstate. Is there a more appropriate way to confirm
this other than using tlp? Also, according to tlp, the scaling-govenors
swtich appropriately (performace for A/C and powersave for bat).
Lastly, I just wanted
Just another observation, the scaling_max_freq is now at 390 (the
boost max) using pstate vs 2801000 (standard max) when using acpi-
cpufreq driver.
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Hi Carl,
Xenial kernel with intel_pstate Kabylake support to test is at
http://people.canonical.com/~khfeng/lp1674390/
commit 7791e4aa59ad724e0b4c8b4dea547a5735108972
Author: Srinivas Pandruvada
Date: Thu Feb 25 15:09:19 2016 -0800
cpufreq: intel_pstate: Enable HWP by default
If the
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.11 kernel[
TLP settings:
--- TLP 0.8
+++ Configured Settings: /etc/default/tlp
TLP_ENABLE=1
TLP_DEFAULT_MODE=AC
DISK_IDLE_SECS_ON_AC=0
DISK_IDLE_SECS_ON_BAT=2
MAX_LOST_WORK_SECS_ON_AC=15
MAX_LOST_WORK_SECS_ON_BAT=60
CPU_MIN_PERF_ON_AC=0
CPU_MAX_PERF_ON_AC=100
CPU
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