See first patch (does not fix the problem) and further discussion at
http://marc.info/?l=linux-kernel&m=146435528326660&w=2
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Title:
Public bug reported:
I have just upgraded to Ubuntu 15.10 and almost immediately my CPU fan
started speeding and slowing without good reason even when the PC is
idle.
I tried various things but then found that if I leave the computer off
for a long time and let everything cool down then when I bo
apport information
** Tags added: apport-collected wily
** Description changed:
I have just upgraded to Ubuntu 15.10 and almost immediately my CPU fan
started speeding and slowing without good reason even when the PC is
idle.
I tried various things but then found that if I leave the c
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514762/+files/UdevDb.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514757/+files/ProcCpuinfo.txt
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** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514752/+files/CRDA.txt
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Ti
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** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514755/+files/Lspci.txt
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** Attachment added: "JournalErrors.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514754/+files/JournalErrors.txt
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** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514756/+files/Lsusb.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514758/+files/ProcEnviron.txt
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** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514760/+files/ProcModules.txt
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** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514764/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514763/+files/UdevLog.txt
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** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514759/+files/ProcInterrupts.txt
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** Attachment added: "PulseList.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514761/+files/PulseList.txt
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** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1514052/+attachment/4514753/+files/CurrentDmesg.txt
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Just quick addition to the description..
Here is a log of the processor fan RPM taken over a few seconds as the PC is
idle showing what I consider to be excessive changes in the CPU fan RPM whilst
the CPU temperatures are quite low and the PC is idle:
Processor Fan:382 RPM
Processor Fan:
On my machine I seem to have i8k built into the kernel rather than as a
loadable module
# modinfo i8k
filename:
/lib/modules/4.2.0-17-generic/kernel/drivers/hwmon/dell-smm-hwmon.ko
alias: i8k
license:GPL
description:Dell laptop SMM BIOS hwmon driver
author: Pali
attached dmi decode for the offending machine
** Attachment added: "dmidecode.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514052/+attachment/4515169/+files/dmidecode.txt
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Loaded the latest Kernel ..
Following produced erratic fan speed .. see that the fan naming seems sorted.
Pity that did not solve it!
# echo 200 > /sys/class/hwmon/hwmon3/pwm1
# echo 70 > /sys/class/hwmon/hwmon3/pwm1
# sensors
radeon-pci-0100
Adapter: PCI adapter
temp1:+57.0°C (crit = +
I take that back.. I see that the fan ordering is still the same as all
the other failing kernels... not that I think that it will make any
difference anyway!
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how can I add my bug to
https://bugzilla.kernel.org/show_bug.cgi?id=100121#c29.. I dont want to
create a new bug that just gets dropped as a duplicate.
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Bug report submitted - http://marc.info/?l=linux-
kernel&m=144917448916562&w=2
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Title:
erratic fan speed and little control kernel 4
sorry should have said
to stop itto stop it
echo 200 > /sys/class/hwmon/hwmon3/pwm1
echo 70 > /sys/class/hwmon/hwmon3/pwm1
reboot
before the reboot cpu fan is slow but erratic
whilst the reboot the cpu fan goes up to max then stops when linux unloaded.
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Just tried out the kernel as per instructions
Linux HomeMegaUbuntu 4.3.0-040300-generic #201511020949 SMP Mon Nov 2
14:50:44 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
echo 200 > /sys/class/hwmon/hwmon3/pwm1
echo 70 > /sys/class/hwmon/hwmon3/pwm1
results in the erratic fan speed.
if no erratic beh
Ok so I might have a bit of time to start this... in summary I have
already on my machine kernel 3.19.0-31-generic (last good version before
my update) kernel 4.2.0-17-generic (bad version installed with wily)
If I understand the basic process (from reading
https://wiki.ubuntu.com/Kernel/KernelBis
Just cloned the kernel source and confirmed that
f989e55452c74b4f7b22c889b8ec9f1192aaeec4 is in the range
Ubuntu-4.2.0-18.22 Ubuntu-3.19.0-20.20 so I will have a go first at
building / testing the kernel either side of this commit.
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As expected f989e55452c74b4f7b22c889b8ec9f1192aaeec4 is a bad commit.
When kernel built with the preceeding commit
1a131ca1de7a84cf3827c418ee5971b493c6f23f then the fan is well behaved..
ie echo 200 > /sys/class/hwmon/hwmon3/pwm1
The fan speed builds up gradually and results in a reasonable con
Small update... still using 1a131ca1de7a84cf3827c418ee5971b493c6f23f
CPU fan just shot up to high revs and then back down to low revs after several
hours of use. Just one shot no more high revs so very different
characteristics to the bad kernel but still interesting.
Core 0: +31.0°C (hi
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