[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete = Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Wiggy, thank you for reporting this and helping make Ubuntu better. As you noted how the that this issue began using Natty but reverting to kernel 2.6.34-02063407, the next step is to perform a bisect to narrow down the offending commit. Could you please perform this following https://wiki.ubuntu.com/Kernel/KernelBisection? ** Changed in: linux (Ubuntu) Status: Confirmed = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
On my lenovo X200s, I have this problem since natty and it's still there on precise. Pretty serious bug, if I wasn't geek enough to find the workaround (same as comment #38) my laptop would be just unusable. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Having this problem on 11.10, on a Dell Lattitude Laptop. It occurs only and always when the machine has been plugged in to mains power, is disconnected, then plugged back in again. When I need to use the mouse I can temporarily unplug the power wire and it works again! (Then dies again when plugged back in.) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I belive I have found a fix for this ! This worked perfectly for me. Reboot your system with the new kernel. Open shell and become root. Type #echo N /sys/module/drm_kms_helper/parameters/poll This should drastically reduce the system load and put your system back to normal. Note that this will only be sustained till system reboot. After reboot the value will revert back to poll=Y For a sustained effect: #echo options drm_kms_helper poll=N/etc/modprobe.d/local.conf Hope this will help your woes. Enjoy! Please post any problems you may experience. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
kworker process problem is still there while returning from suspend on my T400, even with kernel 3.0.0.16 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
T400 with the kworker freeze, especially noticeable after long period of input inactivity (!?) or returning from suspend (activated by lid closure). running kernel 3.0.0-12-generic #20-Ubuntu SMP (LinuxMint 12) followed suggested fix in post #26. Seems to correct, at least shut lid for suspend and opened to find cursor is free-flowing. Will continue to watch ... Can also report have identical setup on a T61 with no troubles at all with kworker slowdown. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Occuring here on a brand new Dell Lattitude (E5420). Making it unusable -- should be a top priority bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
There is no single cause for kworker issues: https://lkml.org/lkml/2011/3/30/836 Getting additional information: https://lkml.org/lkml/2011/3/31/68 Would it be possible for you to test the latest upstream kernel? It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . If possible, please test the latest v3.2-rcN kernel (Not a kernel in the daily directory). Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag(Only that one tag, please leave the others). This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. If this bug is fixed by the mainline kernel, please add the following tag 'kernel-fixed-upstream-KERNEL-VERSION'. For example, if kernel version 3.2-rc1 fixed and issue, the tag would be: 'kernel-fixed- upstream-v3.2-rc1'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Thanks in advance. ** Tags added: needs-upstream-testing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
There are some kworker process which comsume tons of CPU time at each wake up. It was very bad on 10.10 but become no so bad in 11.04 and 11.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
In case anybody with the same hardware as me comes across this: I'm seeing the same symptoms on a Dell E6410 powered by an nVidia card using the nouveau driver. The workaround described in comment #26 also fixes the problem for me. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I'm afraid this issue is still alive in 11.10 Beta 1, kernel 3.0.0-9-generic 64 bits on a T400. Before finding this issue I had posted this other bug: https://bugs.launchpad.net/ubuntu/+bug/840949. I just marked it as a duplicate of this bug. I'll try the workaround and a newer kernel and keep you posted. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
All right, after updating the kernel to 3.0.0-10 (from the updates) and applying Poul's workaround it works much better. Thank you very much. Let's hope the kernel people find a permanent solution for this :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I'm afraid I have to report the issue persists with Ubuntu 11.04 and Kernel 3.0.3-030003-generic. To make matters worse, Paul's workaround has less effect with this kernel, i.e. I am experiencing random peaks of kworker load making the system almost unusable even with the workaround in place... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
The workaround from Paul's link solved the problem and 2.6.38-8-generic runs flawlessly at Lenovo T400. Thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Poul, thanks for the sharing. Now my R400 is usable again !!! :) BTW, I'm not sure if this drm is the root cause, since one of my tricks to get the unusable laptop back to work is to switch off the wlan/unplug the USB mouse etc. As I reported earlier, the interrupts from graphic/ethernet and other peripherals are extremely high when my R400 is not usable. I'm wondering why these two symptoms are correlated. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I'm facing the same issue, also on a T400. perf.data are attached. I'm not sure what's starting the problem. Once it started a few minutes after system start, and I had only been using Firefox. In every case it's seems to be related to I2C. Does a laptop have an I2C bus anyway ? @olaf can you still confirm that compiling the newest source of drm is a usable workaround ? I'm not to fond of having a lot of software, not handled by the package management. ** Attachment added: perf.data https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+attachment/2155764/+files/perf.data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
@Poul Møller Hansen Hi Poul, It seemed like an improvement at first, however I had the issue reoccurring again throughout the last days - so my previous attempt to manually install the 2001 Q1 release of libdrm does *not* resolve / improve the issue. The perf data still shows a problem with kworker / intel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I thought so. I would imagine that it's kernel related. So far this workaround has worked here http://souriguha.wordpress.com/2011/03/08/how-to-solve-problem-with-thinkpadkslowd-kworker-on-linux-kernel-2-35-2-36/ At least my T400 is usable now :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
So I´m back with the results with updating the libdrm since it's one of my suspects. So far I've build installed the latest version o f librm (Release Q1 2011). The system is much more stable after that. I´ve only hat one kworker spike for about 5 Seconds since, which in my case is an improvement. Here is what i did: 1.) Download unpack the latest *stable* libdrm release: http://dri.freedesktop.org/libdrm/libdrm-2.4.25.tar.bz2 2.) Install libraries / headers required to compile libdrm sudo apt-get install libpthread-stubs0-dev 3.) in a terminal within the unpacked libdrm directory, do ./configure make sudo make install 4.) reboot. Luckily I was able to capture that one last spike, too. Again, the intel driver, however a different call than before. # Events: 8K cycles # # Overhead CommandShared Object Symbol # ... ... ... # 26.11% kworker/0:1 [i915] [k] i915_gem_execbuffer_relocate_slow | --- i915_gem_execbuffer_relocate_slow | |--99.79%-- sclhi | | | |--84.92%-- i2c_bit_add_numbered_bus | | i2c_bit_add_numbered_bus | | i2c_bit_add_numbered_bus | | i2c_bit_add_numbered_bus | | i915_gem_execbuffer_relocate_slow | | i915_gem_execbuffer_relocate_slow | | i2c_transfer | | drm_class_suspend | | drm_class_suspend | | i915_gem_execbuffer_relocate_slow | | drm_fb_helper_initial_config | | process_one_work | | | | | |--78.40%-- worker_thread | | | kthread | | | kernel_thread_helper | | | | | --21.60%-- process_scheduled_works | | worker_thread | | kthread | | kernel_thread_helper | | | --15.08%-- i2c_stop | i2c_bit_add_numbered_bus | | | |--83.99%-- i2c_bit_add_numbered_bus | | i2c_bit_add_numbered_bus | | i915_gem_execbuffer_relocate_slow | | i915_gem_execbuffer_relocate_slow | | i2c_transfer | | drm_class_suspend | | drm_class_suspend | | i915_gem_execbuffer_relocate_slow | | drm_fb_helper_initial_config | | process_one_work | | | | | |--79.71%-- worker_thread . -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
And here's the perfdata for my last post ** Attachment added: perf.data https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+attachment/2151850/+files/perf.data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Same problem with my R400. The itop shows that sometimes the i915 and i804 have interrupt storms, sometimes 2 interrupts per seconds. Kworker is consuming 90% CPU loading. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
@chen wei I beleive our issues are in fact addressed by #746084 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/746084). @all it would be great if more people affected by this could provide perf records (sudo perf record -ag sleep 10) to determine the source; this issue might indeed be a duplicate. Perhaps this is an issue with drm? It's a rather long shot but I'll try building the libdrm from source (http://intellinuxgraphics.org/download.html) and see if this helps. Will report back with results. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Here is my perf record. Runnning on a T400. System hangs every 3 seconds for about .5 to 1 second continuously. I an duplicate this bug usually when docking/redocking or suspend/resume. ** Attachment added: perf.data https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+attachment/2151280/+files/perf.data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Here is my perf data taken during high kworker CPU. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
File did not attach to my last post. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
OK, third time lucky, I've given myself rights to read the file this time ;) ** Attachment added: perf.data https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+attachment/2151444/+files/perf.data -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Allright, re-installed 11.04 yesterday, standard kernel: 2.6.38-8-generic-pae #42-Ubuntu SMP Mon Apr 11 05:17:09 UTC 2011 i686 i686 i386 GNU/Linux Just managed to observe the issue for more that 4 seconds and capture it with perf. Seems its the intel gfx drivres in my case: # Overhead Command Shared Object Symbol 45.29% kworker/1:1 [i915][k] get_clock | --- get_clock | |--99.73%-- sclhi | | | |--85.30%-- i2c_outb.clone.1 | | try_address.clone.4 | | bit_doAddress.clone.5 | | bit_xfer | | intel_i2c_quirk_xfer | | gmbus_xfer | | i2c_transfer | | drm_class_suspend | | drm_class_suspend | | intel_hdmi_detect | | drm_fb_helper_initial_config | | process_one_work | | | | | |--69.63%-- worker_thread | | | kthread | | | kernel_thread_helper | | | | | --30.37%-- process_scheduled_works | | worker_thread | | kthread | | kernel_thread_helper | | | --14.70%-- i2c_stop | | | |--78.80%-- try_address.clone.4 | | bit_doAddress.clone.5 | | bit_xfer | | intel_i2c_quirk_xfer | | gmbus_xfer | | i2c_transfer | | drm_class_suspend | | drm_class_suspend | | intel_hdmi_detect Attaching data captured with perf. Is this a known issue? Can I provide additional information? Please advise. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Same problem on Thinkpad R400 @ 11.04. Upgrading to kernel 2.6.39 did not resolve the problem. Kworker threads (4 of them) suddenly consume all CPU resources. Sometimes the system recovers, sometimes it blocks for 5 minutes, i.e. until I flip the switch. This happens on an fresh, out-of the box installation. However, the first few reboots / hibernation / suspend-cycles do not yield the issue; the problem appears after a few hours to days of usage - perhaps in conjunction with inserting a USB device (mobile broadband, anyone?) and / or configuring Network / WIFI connections. I will re-install once more and test, recording perfdata using the ridiculous method Linus suggested: perf record -ag sleep 10 perf report (see https://lkml.org/lkml/2011/3/30/836) Seems this is completely kernel / driver -related, since multiple distros are affected. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
While my machine doesn't freeze completely, kworker use 60-100% of one of the cpu cores all times when running Linux 2.6.38-8-generic on a ThinkPad X61. Reverting back to Linux 2.6.35-28-generic for now. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I have an ideapad u350 and have the same symptoms. uname -a Linux slack 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux It makes the machine virtually useless -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Having my own mixed results with rc4 as well. Similar... but different. More on that in a moment. There are a number of kernel or driver related bugs with various freeze/hang symptoms (and likely various root causes). Since this bug has T400 in the name I'm removing my earlier duplicate flag. That way my fellow T400 owners have a simple place to track whether the issue we are all experiencing has truly been resolved or not. Given the number of hang/freeze related bugs I have looked at, I'd like to know if we are all experiencing the same symptoms. Also gives us a way to separate this issue from similar bugs with causes and fixes irrelevant here. With 2.3.38 - problem manifests intermittently. When it surfaces, every moment of fluid activity is followed by a moment frozen. Seems exacerbated by resuming from sleep or running from battery. Worst in the first 10 minutes after booting/resuming. Found a bug that causes the system to freeze every 30 seconds or so - symptoms here are distinctly different. With 2.6.39rc4 - So far, I have not experienced the same quick cycling freeze, but in the first few minutes after boot and resume the mouse and keyboard will stop taking input for longer periods, 10s of seconds to minutes at a time. However, only a handful of boots at this point. ** This bug is no longer a duplicate of bug 746084 [i945gm] Stuttering mouse with Natty Narwhal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Jeffrey, I see the exact same symptoms as yourself. With 2.6.39rc4 a few times it froze completely, I waited about 3 minutes and then rebooted. I'm unable to use Natty, it's too frustrating, I now have Maverick and Natty installed on separate partitions, as stated earlier 2.6.34 is the latest kernel that does not cause issues with Maverick. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Same here. 11.04 on a ThinkPad T400. Behaves almost exactly like the kslowd issue from maverick. Only way I found to fix the problem in maverick was to freeze to the 2.6.32 kernel. Not an option for Natty. Kernel hacker I am not, but happy to help however possible to sort this. Most annoying aspect is that it's inconsistent, but when activity spikes, it's definitely a kworker thread, 0:0 for me. Worst shortly after booting, after resuming from sleep, and when running from battery. Seems to be endemic among T400s. Did all my fellow T400 owners have the same issue with kslowd for 2.6.34 to 2.6.36? Possible duplicates: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/717919 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/746084 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/744154 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Spoke too soon. When left idle during 60 second powertop -- Top causes for wakeups: 32.7% ( 58.5) [ 0] [kernel scheduler] Load balancing tick 28.8% ( 51.6) [ ] [iwlagn] interrupt 23.1% ( 41.3) [ ] kworker/0:0 -- ** Attachment added: powertop.txt https://bugs.launchpad.net/ubuntu/+source/linux/+bug/779753/+attachment/2135377/+files/powertop.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
11.04 is completely unusable on the T400. I have now reverted back to 10.10 with 2.6.34-02063407-generic kernel. Any newer kernel has the freezing/stuttering problem with kslowd or kworker. I happy to run any tests needed to try and diagnose this fault. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
*** This bug is a duplicate of bug 746084 *** https://bugs.launchpad.net/bugs/746084 Believe this to be a duplicate of bug #746084 with a likely fix in upstream kernel - anything 2.6.39rc2 or later. https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video- intel/+bug/746084/comments/11 No freezing or stuttering with 2.6.39rc4 and based on what I see in the system monitor panel applet, idle processes seem to be consuming less CPU time in general. Thanks to https://launchpad.net/~ikt for cause and fix from upstream. ** This bug has been marked a duplicate of bug 746084 [i945gm] Stuttering mouse with Natty Narwhal * You can subscribe to bug 746084 by following this link: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/746084/+subscribe -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Exactly the same problem here in 11.04 on ThinkPad T400. It's making whole system unusable. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
** Changed in: linux (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Same here on a Thinkpad T500 and exactly the same behavior (including fslowd in 10.10 and kworker on 11.04). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
I forgot to mention when this occurred in 10.10 process was kslowd, not kworker. It happened on all kernel versions post 2.6.34. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 779753] Re: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU.
Hello, I have exactly the same behaviour... (Thinkpad T400) When I tried to install 10.10 I had freezes so I decided to rollback to 10.04 (no problem). But this week end, I upgraded to 11.04 and the system sometimes freezes and then everything come back to normal. It seems that kworker uses a lot of CPU during freeze... What informations can I provide to help you with this bug? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/779753 Title: T400 laptop. Freezes or mouse stutters. Kworker process using too much CPU. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
