@Carl, I burrowed a Precision 5520 and seems to be normal. Not sure what
happened on your system...
--- TLP 0.8
+++ Processor
CPU Model = Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver= intel_pst
It's at LP: #1674390.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
Status in linux package in
@Kai-Feng. The other bug regarding p-state as disappeared (I cannot
access it on Ubuntu bugs). This bug also appears to be fixed as p-state
is now the default scaling driver. However tlp stat is showing unusual
max/min cpufreq settings after kernel installation. Do these settings
seem incorrect and
Kernel 4.4.75 appears to have fixed the problem for C states.
Package | Core|CPU 0 CPU 4
POLL0.1%| POLL0.0%| POLL0.0%0.0 ms 0.0%
0.0 ms
C1E-SKL 1.4%| C1E-SKL 2.9%| C1E-SKL 3.5%0.3 ms 2.
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:
No C-State Deeper than C3 utilized by Ka
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
It's ok ;)
The new kernel in xenial-proposed should fix this issue.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ
Sorry to be so persistent but Intel has posted a warning about not using
lower power states. See page 64 of this data sheet:
http://www.intel.com/content/www/us/en/processors/core/6th-gen-core-
family-mobile-u-y-processor-lines-datasheet-vol-1.html
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@Kai-Heng Feng, the fix is not showing up in 4.4.0-72
carl@carl-5520:~$ uname -a
Linux carl-5520 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
carl@carl-5520:~$ sudo powertop
Package | Core|CPU 0 CPU 4
Fix not showing in 4.4.0-71 either. Just FYI in case it was intended.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ
Fix not showing up in 4.4.0-70. Not sure if it was intended for this
release.
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Title:
No C-State Deeper than C3 utilized by Kaby Lak
** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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Title:
No C-State Deeper than C3 utilized by Kaby
Kai-Heng,
It has been filed:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674390
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Title:
No C-State Deeper than C3 utiliz
You are right. Can you file another bug report?
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
Kai-Heng Feng, I also noticed that by default the scaling driver used is
acpi-cpufreq and not p-state. I've read that p-state is favorable for
kernels >= 4.4. Is this something that is up to the user to decide or
should this be considered an incorrect default?
analyzing CPU 0:
driver: acpi-cpufr
You should remove the custom kernel and use the official Ubuntu kernel.
The deeper C state patch should be included soon.
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Title:
N
Excuse my ignorance, but does that mean I should continue to use your
4.4.0-68 kernel and as Canonical releases kernel updates, I should
naturally phase into the regular update stream again? Or should I revert
to the newest updated (4.4.0-67) and remove your custom kernel?
Thanks!
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It should be included in version >= 4.4.0-68.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
St
@Kai-Heng Feng, I am not sure if this patch was intended for 4.4.0-67
(which recently was updated via Software Updater) but that kernel
version reverted my CPU behavior back to only using C3 states and
nothing deeper. Just FYI.
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** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
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Kai-Feng, you were right about Powertop. I am a big fan of presuming th
worst. For some reason, my trackpad stopped tracking (I could click but
no movement). However upon restart it seems to be fully restored and
operational.
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Thanks for your test! I'll backport this patch to Ubuntu Xenial's
kernel.
>From the log, I think your machine is preloaded with Ubuntu, right? It
should come with TLP installed. TLP only enables runtime PM when power
cord is unplugged, those "bad" should become "good" once the laptop run
on batter
Autotune with powertop works fine. No interference. Still showing heavy
usage of C10 state when idling :) :)
I think this is a worthy path to incorporate for us 5520 users.
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sudo powertop (idel stats)
Package | Core|CPU 0 CPU 4
POLL0.0%| POLL0.0%| POLL0.0%0.0 ms 0.1%
3.1 ms
C1E-SKL 0.5%| C1E-SKL 0.2%| C1E-SKL 0.4%0.6 ms 0.0%
0.1 ms
C3-SKL 0.2%|
However, I notcied powertop is now not automatically choosing to adjust
many of the bad parameters to good (not sure if that is related...).
Most of the PCI devices are not set to Bad when previously they were
automatically at Good.
Bad Enable SATA link power management for host0
Also trying to run turbostat:
sudo turbostat --debug
WARNING: turbostat not found for kernel 4.4.0-68
You may need to install the following packages for this specific kernel:
linux-tools-4.4.0-68-generic
linux-cloud-tools-4.4.0-68-generic
You may also want to install one of the follo
Just an FYI, I do see this warning every time I've tried to build a
kernel on my 5520. Not sure if this is an issue.
: Unable to find an initial ram disk that I know how to handle.
Will not try to make an initrd.
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Okay. Right away I notice a difference with the program i7z:
Cpu speed from cpuinfo 2875.00Mhz
cpuinfo might be wrong if cpufreq is enabled. To guess correctly try estimating
via tsc
Linux's inbuilt cpu_khz code emulated now
True Frequency (without accounting Turbo) 2895 MHz
CPU Multiplier 29x
Okay. I'll try it out.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
Status in linux package i
Should I install all four .deb packages in the link you provided?
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Title:
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No, that's why I built a slightly newer kernel, 4.4.0-68, so it won't
mess with the current release kernel, 4.4.0-66.
It's okay if don't want to test it, I already tested it on Precision
5520 at my hand.
The problem lies here is, 5520 has several different configs, I want to
make sure the patch w
@Kai-Heng Feng, What are the odds of this backport patch being included
with the next update from Canonical for 16.04. Since your recommended
kernel is 4.4.0-68 do you think it will arrive as part of the regular
release schedule? I can report if the patch worked when it arrives. As
much as I love t
I tested on an KBL laptop and it did have the issue. Backport a patch
can make the machine idle to C10.
commit 3ce093d4de753d6c92cc09366e29d0618a62f542
Author: Len Brown
Date: Wed Apr 6 17:00:59 2016 -0400
intel_idle: Add KBL support
KBL is similar to SKL
Signed-off-by: Len Brown
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[
Let me know what other information I could supply.
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
552
~$ sudo i7z
sudo i7z
i7z DEBUG: i7z version: svn-r93-(27-MAY-2013)
i7z DEBUG: Found Intel Processor
i7z DEBUG:Stepping 9
i7z DEBUG:Model e
i7z DEBUG:Family 6
i7z DEBUG:Processor Type 0
i7z DEBUG:Extended Model 9
i7z DEBUG: msr = Model Specific Register
i7z DEBUG: Unknown proces
~$ sudo turbostat
cpu0: Guessing tjMax 100 C, Please use -T to specify
CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- 1006.6315002904
0 1097.2715002904
4 805.3315012904
1 1338.8514982904
5 936.
Installed:
intel-microcode_3.20161104.1~deb8u1~bpo7+1_amd6
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Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precis
~$ dmesg |grep idle
[0.00] clocksource: refined-jiffies: mask: 0x max_cycles:
0x, max_idle_ns: 7645519600211568 ns
[0.00] clocksource: hpet: mask: 0x max_cycles: 0x,
max_idle_ns: 79635855245 ns
[0.044934] process: using mwait in idle threads
[
~$ sudo powertop (Idle Stats tab)
Package | Core|CPU 0 CPU 4
POLL0.0%| POLL0.0%| POLL0.0%0.0 ms 0.0%
0.0 ms
C1 0.8%| C1 0.3%| C1 0.3%0.2 ms 0.4%
0.6 ms
C2 12.7
cat /sys/module/intel_idle/parameters/max_cstate
~$ cat /sys/module/intel_idle/parameters/max_cstate
9
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