Another prowd Samsung 7 17" owner: NP700Z7C-S01UB (Best Buy model),
Running the latest 12.10 with all oficial updates: 3.5.0-18 kernel as of
now. Clean install.
Same symptoms, as tja's (see above), only neither pci=noacpi, nor acpi=noirq
fix it for me.
In fact, adding those to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub made
that one core usage (by kworker) go from 75-80% to 100%. The same thing (100%
usage) happens upon waking-up from Suspend.
The "good news" (sort of) is that the problem is intermittent. Sometimes
(rarely) the computer starts just fine. Other times it can be "fixed" by
jerking the power plug in and out: one or several times.
It did not happen on install, neither happens on booting from live
CD(DVD). Tested 3 times.
I do have (and highly recommend) minimal Bumblbee installed: w/o Nvidia
drivers - for power saving only. It does make difference to core
tempretaures and the battery usage. I tested the problem with and w/o
Bumblbee (immediately after the fresh install). No difference, so it is
not a Bumblbee issue. I did several clean installations and tested it
with and w/o the initial 12.10 updates (namely from 3.5.0-17 to to
3.5.0-18 kernel). No difference - occures with both.
The only sure way to fix it is keep restarting. What I noticed is
alternating kernel versions (-17 and -18) fixes it more often than not.
Still intermittent. And by "fixing" I mean doing the power cord trick.
It rarely boots w/o that 75% usage. Sometimes however it does go away on
its own after a minute or two of uptime.
It's vanilla 12.10. No specific fixes were applied except for Bumblebee.
Single boot: Windows was nuked completely. This is a superb machine:
12.10 works out f the box w/o any earlier 12.04 problems on Series 7
notebooks (video, trackad, suspend, etc.). I can live w/o Samsung-
specific keys (to change keyboard brightness and fan speed). This
problem is however very annoying. Please fix.
powertop output:
Overview:
Usage Events/s Category Description
16.2 ms/s 685.3 Interrupt [9] acpi
100.0% Device Audio codec hwC0D0:
Realtek
100.0% Device Audio codec hwC0D3: Intel
2.9 ms/s 124.0 kWork acpi_os_execute_deferred
4.9 ms/s 61.2 Process compiz
24.7 ms/s 49.9 Process gnome-system-monitor
3.0 ms/s 20.4 Process [kworker/0:1]
38.5 ms/s 8.7 Process apt-check
19.9 ms/s 11.4 Process /usr/bin/X :0 -core
-auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -bac
142.0 µs/s 13.6 Process syndaemon -i 2.0 -K -R -t
699.9 µs/s 11.6 Interrupt PS/2 Touchpad / Keyboard
/ Mouse
179.4 µs/s 10.2 Timer hrtimer_wakeup
2.0 ms/s 7.6 Process gnome-terminal
5.5 ms/s 4.9 Process update-notifier
189.4 µs/s 7.7 Interrupt [45] i915
292.1 µs/s 6.6 Process /usr/sbin/mysqld
1.5 ms/s 5.5 Interrupt [7] sched(softirq)
117.1 µs/s 5.6 Interrupt [4] block(softirq)
49.2 µs/s 5.3 kWork ieee80211_iface_work
174.8 µs/s 4.7 Process
/usr/lib/gnome-settings-daemon/gnome-settings-daemon
432.9 µs/s 4.1 Timer tick_sched_timer
5.4 ms/s 2.0 Process apport-checkrep
365.8 µs/s 3.7 Interrupt [6] tasklet(softirq)
122.4 µs/s 2.7 Process /usr/sbin/bumblebeed
--use-syslog
19.0 µs/s 2.3 kWork
iwl_bg_run_time_calib_work
2.1 ms/s 1.0 Process /usr/bin/python
/usr/lib/system-service/system-service-d
287.7 µs/s 1.1 Process
/usr/lib/unity/unity-panel-service
178.0 µs/s 0.8 Process indicator-sensors
1.4 ms/s 0.20 Process lsb_release
58.8 µs/s 0.7 Process
/usr/lib/gvfs/gvfs-afc-volume-monitor
11.8 µs/s 0.5 kWork
i915_gem_retire_work_handler
0.0 µs/s 0.5 kWork disk_events_workfn
5.9 µs/s 0.5 Timer watchdog_timer_fn
Tunables:
>> Bad Wireless Power Saving for interface wlan0
>>
Bad Enable SATA link power management for /dev/sda
Bad NMI watchdog should be turned off
Bad VM writeback timeout
Bad Enable Audio codec power management
Bad Autosuspend for unknown USB device 2-1.5 (8087:07da)
Bad Runtime PM for PCI Device Intel Corporation Centrino
Advanced-N 6235
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family PCI Express Root Port 1
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family USB xHCI Host Controller
Bad Runtime PM for PCI Device Realtek Semiconductor Co., Ltd.
RTL8111/8168B PCI Express Gigabit Ethernet controller
Bad Runtime PM for PCI Device Intel Corporation 7 Series Chipset
Family 6-port SATA Controller [AHCI mode]
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family PCI Express Root Port 4
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family USB Enhanced Host Controller #1
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family MEI Controller #1
Bad Runtime PM for PCI Device Intel Corporation 3rd Gen Core
processor Graphics Controller
Bad Runtime PM for PCI Device Intel Corporation Xeon E3-1200
v2/3rd Gen Core processor PCI Express Root Port
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family USB Enhanced Host Controller #2
Bad Runtime PM for PCI Device Intel Corporation 7 Series/C210
Series Chipset Family High Definition Audio Controller
Bad Wake-on-lan status for device eth0
Good Bluetooth device interface status
Good Autosuspend for USB device WebCam SC-13HDL11431N [123]
Good Autosuspend for unknown USB device 1-1 (8087:0024)
Good Autosuspend for unknown USB device 2-1 (8087:0024)
Good Autosuspend for USB device EHCI Host Controller [usb1]
Good Autosuspend for USB device EHCI Host Controller [usb2]
Good Autosuspend for USB device xHCI Host Controller [usb3]
Good Autosuspend for USB device xHCI Host Controller [usb4]
Good Using 'ondemand' cpufreq governor
Good Wake-on-lan status for device wlan0
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https://bugs.launchpad.net/bugs/887793
Title:
Kworker constantly taking about 100% CPU
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