Can you reassign this bug to thermald package?
Or should I create a new one?
Thanks
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Title:
Erratic behavior of CPU frequency contro
Disabling thermald with:
sudo systemctl stop thermald
right after boot, before applying any load seems to help getting stable
performance.
A thermald bug?
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** Summary changed:
- Erratic behavior of intel pstate CPU frequency control
+ Erratic behavior of CPU frequency control under load
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Temperatures:
Before the performance drop: up to 97 C
After performance drop: 52-55 C
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Title:
Erratic behavior of intel pstate CPU f
Perf data collected for the run above.
** Attachment added: "perf.data"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797802/+attachment/5203562/+files/perf.data
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I collected some perf data for further analysis.
I run a simple arithmetic multi-core benchmark.
The benchmark is 100% CPU bound - it adds 2 integers.
perf record java -jar target/benchmarks.jar
org.ttnr.pmato.e2.cpumem.ArithmeticsBenchmark.add -wi 0 -i 40 -t 4 -f 1
# JMH version: 1.21
# VM vers
More observations:
The problem does not happen if I disable Intel speed-step in BIOS.
In this case, the CPU frequency of all cores goes to 2998 MHz whenever under
load, and stays stable regardless of how long the load is applied.
The problem still happens even if intel_pstate=disable is passed
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Erratic behavior of intel pstate CPU frequency control
Huh, another surprise. After running my infinte loop for the time I
wrote the previous post, suddenly it "magically" fixed itself and now
one core reports 100% C0 and ~6% C1, temperature 57, voltage 0.94. The
frequency did not go above 2.8 GHz, though.
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And as soon as I hit "rebuild project" in the IDE, the frequencies go
immediately down from 2.8 GHz to about 1.2-1.5 GHz now.
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Title:
The problem exists in 4.19.rc7 I just tried.
So overall, I'm not sure now if this is a "different state" of the
system, or just a normal behavior of it.
Fresh after boot, the CPU is willing to use frequencies above 3 GHz. The
same when I launch my IDE (IntelliJ idea for the first time). Then when
Is it normal that C-states percentages reported by i7z don't sum up to 100%,
but exceed it?
Under load, I frequently get C0% close to 99%, but at the same time Halt is at
about 40-60%.
Also when C0 is >90, the frequency of cores goes DOWN. This looks totally
reversed to me.
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Update: I got the "package temperature above threshold" again (still
using 4.18.0-10 kernel), but it did not cause visible performance loss
and i7z still shows the CPU freq can go up to ~3.8 GHz easily. So maybe
these messages are not related.
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> Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
It started happening after upgrading from 18.04 to 18.10.
> Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.c
Aaaah, I can see plenty of this in syslog:
Oct 14 22:30:59 p5520 kernel: [ 9481.033687] CPU3: Package temperature above
threshold, cpu clock throttled (total events = 5845)
Oct 14 22:30:59 p5520 kernel: [ 9481.033688] CPU7: Package temperature above
threshold, cpu clock throttled (total events =
BTW, when the system is in this weird state, CPU fans are running at the
lowest speed (but running) and never go to their max speed, even under
heavy CPU load like compiling stuff.
Is there a hidden energy saving thing that tries to keep my CPU clock
low / voltages low at high load?
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Public bug reported:
I noticed that sometimes my Ubuntu 18.10 system feels sluggish. The
other times everything works fine. I don't know what triggers this weird
state. Suspend / resume? Maybe.
At first I thought this was maybe just a "perception issue", but then
when the sluggishness happened ag
Looks like it got solved at least for me on recent Ubuntu 18.10 with the
official kernel. Looks like now hotplugging Dell TB16 dock works fine on
Precision 5520.
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Unfortunately I no longer have the WD15 dock. I switched to TB16 and it
also has some hotplugging issue (there is a separate launchpad ticket
reported by others).
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I have the same issue. Tried today on daily Ubuntu 18.10 build run from live
USB.
The system boots fine or resumes fine with tb16 sick attached. It also survives
disconnecting the dock.
But it does not survive hotplugging the dock - I get a freeze where I
can only move the mouse pointer, but t
After a week of testing v4.14-rc2, the conclusions remain the same:
- System doesn't freeze when booting up and logging in with the dock attached.
- Ethernet doesn't connect automatically on boot / after login, manual
intervention required.
- System doesn't wake from suspend if the dock was discon
No, after disabling apparmor for dhclient, I'm successfully running v4.14-rc2.
However, it looks like exactly the same problems exist with this kernel as with
v4.14-rc2:
1. NetworkManager fails to connect automatically at startup, but
connects fine after manual intervention.
2. System fails to r
4.14.rc2 network problem fixed by running:
sudo ln -s /etc/apparmor.d/sbin.dhclient /etc/apparmor.d/disable/
sudo /etc/init.d/apparmor reload
Now I can use 4.14.rc2 and will let you know how stable it is.
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just FYI: 4.14.rc2 networking failure seems to be caused by dhcp client
crash. Where to submit bug report for this?
Sep 25 21:07:47 p5520 nm-applet[3178]: gtk_widget_destroy: assertion
'GTK_IS_WIDGET (widget)' failed
Sep 25 21:07:48 p5520 wpa_supplicant[1521]: wlp2s0: SME: Trying to authenticate
Still using 4.13.3 today and I already had sudden ethernet connection
dropout which couldn't be reestabliished from NetworkManager without
replugging the dock. I conclude this problem must be related to kernel
then, because as said earlier, on 4.14.rc1 I had no ethernet stability
issues for the who
I also checked 4.13.3 a moment ago and when booting with the dock
attached I got a freeze again soon after starting the desktop session.
So the original bug I reported here was definitely not fixed in 4.13.3,
nor by BIOS upgrade to 1.5.0. However, all network connections were
active at the login sc
I was running v4.14-rc1 for the whole last week.
It is... different.
Good stuff:
- Not a single freeze on fresh boot with dock attached.
- When it connects to eth0, it is stable. Not a single disconnect from
ethernet, but that may be as well the result of recent BIOS upgrade to 1.5.0
and dock f
Also, what are these dots in syslog?
Sep 15 09:55:14 p5520 kernel: [ 21.539677] hid-generic 0003:046D:C31F.0005:
input,hiddev1,hidraw4: USB HID v1.10 Device [Logitech USB Keyboard] on
usb-:3e:00.0-1.7/input1
Sep 15 09:55:14 p5520 mtp-probe: checking bus 3, device 4:
"/sys/devices/pci:
I can confirm 1.5.0:
Sep 15 12:00:22 p5520 kernel: [0.00] DMI: Dell Inc. Precision
5520/06X96V, BIOS 1.5.0 08/30/2017
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Title:
I upgraded to BIOS 1.5.0 yesterday and also upgraded the dock firmware
yesterday as well again (using windows-10-on-the-go usb stick I created
just for that purpose).
No improvements - I got a nice freeze on boot again (kernel 4.12.13).
Also, Windows 10 seems to be working on the same hardware ju
Also, I've read this on another USB ticket in bugzilla:
All USB bugs should be sent to the linux-...@vger.kernel.org mailing
list, and not entered into bugzilla. Please bring this issue up there,
if it is still a problem in the latest kernel release.
So it looks like the mailing list is the onl
Tried posting to linux-usb mailing list but I got no answer back. Any
other ways to report this problem?
The problem still exists with kernels 4.13.2 and 4.12.13.
I updated BIOS to 1.5.0 released today and also applied a fresh firmware update
to WD15 from Dell (using Windows, because Linux can't
Unfortunately that turned out to be a fluke. I had two freezes on
4.11.12, and just a freeze a minute ago on fresh 4.13.rc3 installed from
http://kernel.ubuntu.com/~kernel-ppa/mainline/. No panics though.
I noticed all these freezes have a few things in common:
- they happen only when the dock is
Yesterday I updated to 4.11.9 and so far everything is stable. I managed
to reboot 6 times in a row with no issues. The kernel error is also gone
from syslog.
I'm still not totally sure, because the original issue is a bit random,
so that might have been just a good luck.
The jumpiness of mouse p
I did apport-collect immediately after filing the bug.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Public bug reported:
I'm using Dell Precision 5520 with Ubuntu 17.04.
If I first start a Unity session and then connect Dell WD15 USB-C dock
with an external diplay plugged in, the system detects it properly and
all the things work flawlessly (ethernet, external keyboard, external
display, extern
apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1701499/+attachment/4906422/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "JournalErrors.txt"
https://bugs.launchpad.net/bugs/1701499/+attachment/4906421/+files/JournalErrors.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1701499/+attachment/4906423/+files/ProcEnviron.txt
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** Attachment added: "My syslog from today"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1701499/+attachment/4906424/+files/syslog
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I confirm the bug exists on kernel 4.11.1 and Dell precision 5520 with
Nvidia Quadro 1200M:
[6.658188] nouveau :01:00.0: fb: 4096 MiB GDDR5
[6.658219] nouveau :01:00.0: bus: MMIO read of FAULT at 10ac08
[ IBUS ]
[6.658271] nouveau :01:00.0: priv: HUB0: 10ecc0
I have the same bug on Dell Precision 5520 and Ubuntu 17.04 with either
officially supported kernel 4.10.0-21 as well as mainline kernel 4.11.1.
[0.037469] ACPI Error: [\_SB_.PCI0.XHC_.RHUB.HS11] Namespace lookup
failure, AE_NOT_FOUND (20170119/dswload-210)
[0.037476] ACPI Exception: AE_N
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