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Thread: Strange hangs in Ubuntu 11.10

  1. #1
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    Post Strange hangs in Ubuntu 11.10

    So let me explain a little bit about my setup.
    I upgraded recently from 9.10 to 11.10. It was a clean install, I didn't use the upgrade option because I was quite at the end of the release cycle anyway
    So far the system works fine (Dell Studion 1555 with Broadcomm networking chips) but I noticed the following strange issue which happens sporadically.
    So, here's the problem. Sometimes the system would hang, but in a strange way. Why in a strange way? Because the keyboard and the mouse are still active, the programs are still running, but the Unity panel for example doesn't show when I have a program window maximized. When I close all windows though, the Unity panel appears and I can still use it and start applications. But not everything. Some applications wouldn't start at all from the Unity panel. Also sometimes the Dashboard wouldn't open. Also the work space switcher in Unity wouldn't work. After reboot everything works fine. Anybody else having similar experiences?
    At first I thought that this was caused by Skype as it happened couple of times when I started it. But than it also happened a few times while Skype wasn't running at all...
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  2. #2
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    Wink Re: Strange hangs in Ubuntu 11.10

    Am I the only one that has experienced this )) Wow... interesting..
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  3. #3
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    Re: Strange hangs in Ubuntu 11.10

    The the panel in Unity 3D has hide settings and it will hide when an application is maximized . If using Unity 3D , meaning you are selecting Ubuntu during login and have the CCSM installed you can change these settings.

    I don't what is causing the system lag if you have installed a a recommended proprietary driver from additional drivers .

    The launcher settings can be changed in the Unity plug-in inside CCSM . If you are experiencing lag while running Unity 2D I don't know what the problem may be . Posting more information about your computer such as memory , CPU , and graphics card may be useful .
    Infinite diversity in infinite combination.

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  4. #4
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    Post Re: Strange hangs in Ubuntu 11.10

    I'll give it a try. I haven't messed around with the Unity configs so far. I have CCSM installed though.
    Regarding the specs:
    It's a Dell Studio 1555 with 4GB RAM, the video card is ATI Mobilty Radeon HD 4570 and the CPU is Core 2 Duo T6500 2.1 GHz. I guess it should be enough for the Unity 3D which I'm using. (I recently checked on that as both Unity and Unity2D look quite similar... But for sure I'm running the 3D variant)

    BTW what theme do you use. It's quite sleek! ) In my old 9.10 installation I used an Apple like theme which was great. The one you use reminds me of it.


    Regards,
    Boyan
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  5. #5
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    Cool Re: Strange hangs in Ubuntu 11.10

    I just checked it. On my system I use exactly the same config like in the snapshot you've posted.
    How can I further troubleshoot this. It's quite annoying.
    Recently after two more such hangs my keyboard was also blocked...
    Anyone?
    Registered Linux User #534948

  6. #6
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    Re: Strange hangs in Ubuntu 11.10

    Hi!, lz1dsb,
    Have you checked if all the Unity Plugins are present and activated?
    Code:
    sudo ps ax | grep unity
    Mine shows:
    Code:
    alan-MS-7616:/# ps ax | grep unity
     2109 ?        S      0:00 /usr/bin/unity-window-decorator
     2114 ?        Sl     0:00 /usr/lib/unity/unity-panel-service
     2177 ?        Sl     0:00 /usr/lib/unity-lens-applications/unity-applications-daemon
     2179 ?        Sl     0:00 /usr/lib/unity-lens-music/unity-music-daemon
     2181 ?        Sl     0:00 /usr/lib/unity-lens-files/unity-files-daemon
     2212 ?        Sl     0:00 /usr/lib/unity-lens-music/unity-musicstore-daemon
     2265 pts/0    S+     0:00 grep --color=auto unity
    alan-MS-7616:/#
    Chao!, bogan.
    "Better Solutions may bring Worsened Problems": After Lao Tse, b. circa 405BC. a contemporary of Confucius, who died circa 600BC.
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  7. #7
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    Post Re: Strange hangs in Ubuntu 11.10

    Hi,
    Here's what this command shows on my machine:
    Code:
    bsotirov@bsotirov-Studio-1555:~$ sudo ps ax | grep unity
     2061 ?        S      0:02 /usr/bin/unity-window-decorator
     2071 ?        Sl     2:54 /usr/lib/unity/unity-panel-service
     2337 ?        Sl     0:00 /usr/lib/unity-lens-applications/unity-applications-daemon
     2339 ?        Sl     0:00 /usr/lib/unity-lens-files/unity-files-daemon
     2341 ?        Sl     0:00 /usr/lib/unity-lens-music/unity-music-daemon
     2379 ?        Sl     0:00 /usr/lib/unity-lens-music/unity-musicstore-daemon
    17729 pts/0    S+     0:00 grep --color=auto unity
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  8. #8
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    Lightbulb Re: Strange hangs in Ubuntu 11.10

    I had this "strange" hang once again today (well during the past few weeks more than once ) so I found this:
    I pressed Ctrl+Alt+F1 to get into the command prompt(my keyboard is blocked for everything else, but this key combination seems to work).
    After getting into the command prompt I got back to my desktop session with Alt+F7 and ...voila the problem was solved! For now...
    Right now I'm not quite sure if this is really a workaround but I'll try it out the next time it happens, because I'm sure it will hang again...
    I'll update this thread with the results...


    Cheers,
    Boyan
    Registered Linux User #534948

  9. #9
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    Post Re: Strange hangs in Ubuntu 11.10

    I'v got this hang again today. Again I was able to recover from it using the loging into a console session and getting back to my desktop session...
    Registered Linux User #534948

  10. #10
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    Re: Strange hangs in Ubuntu 11.10

    I would suggest using htop and keeping it open to monitor reported CPU usage.

    I heard that throttling processors can cause the OS to report high CPU usage, even when there's the same amount being used.

    I would check the core temps.
    Acer Aspire M5630: 1 GB Kingston PC6400 DDR2 SDRAM dual channel (2x512 MB), Core 2 Duo E2180 (2.0 Ghz), Intel i915

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