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Thread: High X server CPU utilization in 11.1 when X session idle

  1. #1
    austx NNTP User

    Default High X server CPU utilization in 11.1 when X session idle


    I've been using openSuSE 11.1 for almost two weeks and am generally
    impressed with how smoothly the installation went and the stability of
    the platform. I do have a few X server (or perhaps nvidia driver)
    issues that I'd like some help with.

    1) (The most serious problem.) When an X session (running KDE4) is
    idle for some period of time (say about 10 minutes) its CPU utilization
    shoots to 100%. I disabled the screensaver to rule that out and it made
    no difference. If I have two X sessions running (on vt7 and vt8), the
    one not currently selected will go to 100% while the one I am using
    behaves normally. If both sessions are idle, I can see from the
    text-based console that both X processes have moved to 100% (it's a dual
    core machine). I don't see any telling messages in the X log files or
    dmsg. As soon as I switch to the inactive window, it's X CPU
    utilization drops to normal (even if I don't type anything or move the
    mouse) and everything works just fine after that. X is very stable (no
    crashes so far), but the CPU utilization when idle is hard to explain
    and very "expensive."

    2) This appears to be entirely a cosmetic problem, but KDE4 widgets or
    defined rectangular regions in the task bar occasionally blink between
    "normal" and "mostly black". Mousing over them seems to get them to
    behave for a while. Nothing crashes and I cannot see any lasting
    effects of the problem. My wife says she's seen entire windows do this,
    but I've never seen that (yes, my non-technical wife uses Linux... I am
    blessed). This happens with both the fancy KDE4 effects enabled and
    disabled.

    3) DPMS doesn't work if a screen saver is enabled (I saw someone else
    mention this as well). Disabling the screen saver will allow DPMS to
    turn off the monitor, as expected, after the time expires.

    I cannot find any references to my first or second problem, so I am
    wondering if this is an interaction with my nvidia driver (which is up
    to date). Here's the info about it:

    root@alpha /etc/postfix cat /proc/driver/nvidia/cards/0
    Model: Quadro FX 540
    IRQ: 16
    Video BIOS: 05.43.02.64.35
    Card Type: PCI-E
    DMA Size: 39 bits
    DMA Mask: 0x7fffffffff
    Bus Location: 08.00.0
    root@alpha /etc/postfix cat /proc/driver/nvidia/version
    NVRM version: NVIDIA UNIX x86_64 Kernel Module 177.82 Tue Nov 4
    16:50:05 PST 2008
    GCC version: gcc version 4.3.2 [gcc-4_3-branch revision 141291] (SUSE
    Linux)

    I know my way around the server side of Linux pretty well, but have
    never really developed any expertise with X so I am not sure how to
    debug this or what other info the X experts might find useful. Let me
    know!

    Thanks for any insights.


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  2. #2
    tbrauer01 NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    I have experienced exact same problem with x-window on SUSE 11.1 64-bit
    using ATI X1300 (old) video card. Also updated the video driver - no
    affect. After idle for approx 10 mins - starts using 100% of CPU. I do
    not have solution, but wanted to note have experienced same issue with
    different video card / system.


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  3. #3
    foresthill NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    My previous 11.1 install did this. But my current install (in which I
    did nothing different AFAIK) does not. Go figure.

    Someone suggested that it was the PSU fan making all the noise, but I
    don't know if this is the case.

    Gentlemen, I believe we have a bona fide OpenSuse mystery on our hands.


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  4. #4
    tralalire NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    Hi,

    I'm experiencing the same issue with my HP nc6120 [intel 915GM video
    card].
    I'm running opensuse 11.1 with KDE3 [KDE4 is not a way I want to go
    now]. But I still have few KDE4 packages that have been installed
    automatically.

    The key words of the issues are: kded4, DPMS and powerdevil.

    Here is an interesting link [go through the previous threads]:
    'Re: 100% CPU usage of Xorg after 15 minutes'
    (http://tinyurl.com/7a22tm)
    ...and the related powerdevil bug:
    https://bugs.kde.org/show_bug.cgi?id=174897


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  5. #5
    tralalire NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    As I do not really care about KDE4 applications, I've choose to take the
    easy way and uninstall powerdevil:

    # zypper remove powerdevil-1.4.1-4.3 kdebase4-workspace-4.1.3-10.1.i586
    kdebase4-openSUSE-11.1-66.4.i586

    I'm not experiencing the X hight CPU issue anymore using opensuse 11.1
    and KDE3...

    If you are a KDE4 user you should wait for the packagers to port the
    latest powerdevil 1.4.2 that will probably fix the issue:
    'PowerDevil KDE-Apps.org'
    (http://www.kde-apps.org/content/show...?content=85078)

    If you want to check if the latest version has been ported to
    opensuse:
    'Software.openSUSE.org' (http://tinyurl.com/7lusg2)


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  6. #6
    m kane NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    I disabled "dim display after x min" in power management settings, and
    load is now normal.


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  7. #7
    davebaileync NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    I'm experiencing the same thing on a Dell Precision M4400 with an nVidia
    Quadro FX 770M display adapter. The software is openSUSE 11.1 and NVidia
    177.82-1.1. The backlight can be off or on, lid closed or open, and no
    indications of what's going on in the logs that I can find.

    I would prefer not to leave my backlight on 24-hours a day as I
    typically don't shut the computer down at night.


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  8. #8
    davebaileync NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    Found this:
    https://bugzilla.novell.com/show_bug.cgi?id=461335

    It appears that powerdevil-1.4.1-17 fixes the issue.


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  9. #9
    saltyp NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    god****! I had the same issue with my last install. I tried everything
    (including reinstall). My resolution was to change GPU. The card giving
    errors was a gigabyte GV-8400. I swapped it for an older 7950XT (I paid
    a **** load for this card originally) that fixed my out of control CPU
    usage. There is a chance that this is a reporting issue. It has popped
    up a few times already in this thread. should we BUG this??


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  10. #10
    wangcgfan NNTP User

    Default Re: High X server CPU utilization in 11.1 when X session idle


    I have this problem too
    DELL XPS m1530 ,opensuse 11.1 ,NVidia 177.82
    gnome with compiz enabled.
    when my pc is idle and screensaver is active,
    my computer consume lots of CPU .
    that is when my pc is idle and screensaver is active,my pc's cpu load
    is very high,after i move mouse or press any key to inactive screensaver
    ,cpu usage become normal.
    I install kde 4.1 ,but rare use it . i realize some people said that
    is might because powerdevil ,so i install the newst powerdevil,but have
    no affect about the high cpu usage.
    is this a bug,any one have workaround about it?


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