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Thread: The lxpanel-freeze bug in Knoppix 6

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  1. #1
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    The lxpanel-freeze bug in Knoppix 6

    .
    There is a fairly widespread bug which appears most likely to be in
    lxpanel which affects a number of Linux distros, probably described
    as well for all in Ubuntu Launchpad Bug 800297 at

    https://bugs.launchpad.net/ubuntu/+s...el/+bug/800297

    I think this bug has plagued Knoppix 6 for a long time. I get around
    this bug with Control-Alt-Backspace, and don't think I have lost any
    'work' in progress that I can recall.
    However, I think this is an unhealthy aberration which should come
    under greater scrutiny culminating in some corrective action.

    There is an alternative to lxpanel called Tint2 which may not have
    the problems of lxpanel which some Linuxers are trying out. See

    http://code.google.com/p/tint2/

    I'd be interested to know:
    (1) If others on this forum have observed the lxpanel-freeze bug;
    (2) If anyone has a really 'bad' experience as a result of this bug;
    (3) If any of you found work-arounds or solutions to this problem; and
    (4) If anyone has tried out Tint2, and if so, how did that turn out.

  2. #2
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    Quote Originally Posted by utu View Post
    (3) If any of you found work-arounds or solutions to this problem; and
    I don't really use lxpanel ( that much ). I shrunk lxpanel to 40x25 pixels which allows me to only bring up the lxpanel menu and for that I also enabled auto-hide, ie lxpanel is not shown until I bring the mouse to that corner of the window.

    I use glx-dock instead :-

    http://www.glx-dock.org/index.php

  3. #3
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    Here's another look at the problem.
    Not clear he's solved the problem for everybody, noting the first response.

    http://hardc0l2e.wordpress.com/2011/...fice-document/

  4. #4
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    An alternative to control-alt-backspace
    .
    Control-Alt-Backspace is probably a bit heavy-handed.

    Luckily, in my case this usually happens on closing a LibreOffice program,
    which in itself seems always to have been successful.
    Probably any small, concurrent, un-saved text programs in Leafpad may have
    been sacrificed with a Control-Alt-Backspace shutdowns, and I've just not
    been too excited about that, being more concerned about the survival of
    larger LibreOffice works in process.

    I expect trying to re-activate just lxpanel and not kill x entirely
    might be a better work-around. Toward that end, the following
    gnome-panel-restart approach may be worth trying:

    http://mylinuxnotebook.blogspot.com/...ome-panel.html

  5. #5
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    A minor update

    .
    I finally had another lxpanel freeze today after closing
    LibreOffice. Only pcmanfm and LO icons left on the
    un-responsive lxpanel, no other programs left to close.

    I remembered to try Alt+F2 and tried that and a number of
    Alt-Fn and Ctl-Alt-Fn combinations and none of these worked.

    I did not remember Alt-Tab, so we'll try to remember to
    try that next time.

    -----------
    It is possible, I suppose that Compiz may also have something
    to do with anomalous screen behaviour, hence the following
    addendum.

    FWIW, I have Compiz operative, but have Scale & Expo effects
    disabled, since they annoy me with screen-edge-activation.
    I am similarly annoyed at a spurious screen-cube-activate-rotation
    which I've not been able to isolate as to which effect to modify.

  6. #6
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    Status, as of 21 October 2011.

    I have observed a persistent flaw in the operation of the LXDE
    0.5.8-2 lxpanel function in Knoppix 6. I have commented on this in
    Knoppix and LXDE forums several times previously, to no effect.
    The flaw appears to apply to other LXDE distributions as well.

    I have personally only observed this flaw in the context of
    Knoppix 6, when using LibreOffice for some rather complex spreadsheet
    operations, used always together with a browser on-line and using
    some cut-and-paste data manipulations.

    On closing LibreOffice after some of these spreadsheet operations,
    I occasionally find that lxpanel no longer responds to mouse and/or
    keyboard inputs. At such times there may remain icons on lxpanel,
    representing programs including LibreOffice that were previously
    in use. Also, at such times, the desktop responds to mouse right-
    clicks, but the Knoppix screen for the most part responds only to
    the Control-Alt-Backspace command, so far as I am able to determine.
    No Alt-Tab, Ctl-Fn nor Ctl-Alt-Fn commands seem to have any effect.

    A mouse right-click on the desktop space may bring up any of several
    GUIs, but none of these offer any avenue to input an appropriate
    corrective screen command, as far as I can tell.

    I can easily reactivate lxpanel and regain mouse and keyboard
    functionality with the Control-Alt-Space command with apparently
    no ill effect to LibreOffice, which apparently shuts-down correctly.
    I am unclear as to whether other programs, such as a text editor
    still open at the shut-down of LibreOffice may have been affected.
    Were it possible to do so, I would have chosen to attempt to close
    all programs still open, before doing a full reset of X.

    It would appear Ubuntu thinks this is an 'upstream' problem,
    'affecting (only) three people', and one gets the impression the
    LXDE forum is not close enough to LXDE's godfather to get any
    corrective action initiated there, either.

    I am open to suggestions, but Control-Alt-Backspace is the only
    method of recovery of which I am aware.

  7. #7
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    Since this bug is only shown when you use lxde with LibreOffice, it may be LibreOffice which is bugged instead of lxpanel. In any case, you have at your disposal synaptic package manager, you might want to try different versions of lxpanel and/or LibreOffice. Downgrading the version to stable might be worth trying too. You will help the community in identifying the bug by doing so.

  8. #8
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    Do you still use the testing version of "lxpanel", or did you try to downgrade to stable version "0.5.6-1"?
    I don't know why KK mixed "testing" and "stable" within the LXDE stuff.

    Greetings Werner

  9. #9
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    Greetings, Werner & kl522

    I think both suggestions are very appropriate, however:

    1- I don't know how to 'downgrade' something using Synaptic; and
    2- I did not get a good feeling from browsing the LibreOffice site some time back
    that there was any very well organized bug-repair activity there.

    I recall Werner solved one lxmenu problem by downgrading, so that's surely
    a possibility, but I'll need some tutoring.

  10. #10
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    Greetings, Werner & kl522

    I think both suggestions are very appropriate, however

    1- I don't know how to 'downgrade' something using Synaptic; and
    2- I did not get a good feeling from browsing the LibreOffice site some time back
    that there was any very well organized bug-repair activity there.

    I recall Werner solved one lxmenu problem by downgrading, so that's surely
    a possibility, but I'll need some tutoring.

    Update: I just found 'Force Version' and am trying the 'stable' lxpanel offering.
    Now, we'll have to wait for another upset to see how things progress.

    Thanks, again.

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