Previous 1 2 3 4 5 6 Next 192 Replies Latest reply: Nov 11, 2008 5:12 PM by Lokesh Nara Go to original post
  • Ethanee Level 2 Level 2 (350 points)
    Thanks for being the first guinea pig

    I have a small question: by "bezel" would you be referring to the rounded box containing the icons for programs, and that appears when Cmd-Tab is pressed and not released?

    I'll try this at the end of today after I get back.

    On a side note, I wrote a simple Applescript that switches rapidly between windows. It uses Cmd-Tab as well, but the "bezel" doesn't appear (I don't know how to indicate a "press-and-hold" key combination). I don't know if the bezel has any effect or not. Anyway, I did thousands of switches as fast as possible, but still I did not get hangs (which is why I didn't post). But I haven't been using the external monitor...
  • Ian Searle Level 1 Level 1 (20 points)
    I have been experiencing this problem (though, I haven't seen it in the last week or two). And, yes, I use an external monitor via the MBP DVI connector. I'll try your recipe in a couple hours and see if I can reproduce the problem as well.

    Thanks for uncovering this!
  • George Haritonidis Level 1 Level 1 (0 points)
    I have a small question: by "bezel" would you be referring to the rounded box containing the icons for programs, and that appears when Cmd-Tab is pressed and not released?

    Yes. I think this is called a 'bezel' by Apple engineers, if not, I think it is called that in developers circles.

    I don't know if the bezel has any effect or not.

    Neither do I, however I suspect it since the errors are graphics-related. We could still try using your script though for stress-testing and see how we go.
  • Ian Searle Level 1 Level 1 (20 points)
    OK, connecting and disconnecting my external monitor (DVI) seems to produce varying amount of the following type of log:

    Dec 8 09:26:26 excalibur /Applications/iCal.app/Contents/MacOS/iCal: removeDisplayMapping: _CGSUnmapFramebuffer returns -536870206

    I plugged in my monitor, did a bunch of cmd-tab'ing with no freeze. I unplugged it (more errors in the log) with more cmd-tab'ing. Again, no freeze.

    The MBP I am using today has never exhibited this problem. I'll try again tonight on one that has. And, I'll keep trying on this one as I have time throughout the day.
  • George Haritonidis Level 1 Level 1 (0 points)
    Hi Ian,

    When I was doing the cmd-tabbing, I must've done about 50 in a row (manually, on my keyboard) before it had actually hung. I was doing them constantly for at least 2 minutes, which is a lot more than just a 'bunch'.

    HTH.
  • Ethanee Level 2 Level 2 (350 points)
    Here's the script:
    http://www.uploading.com/files/HCA4G7X1/windowswitcher.rtf.html

    To run, open Script Editor, paste the contents of the file there, and click Run.

    It does the following:
    o Open 4 applications, iTunes, iPhoto, Mail and Safari
    o Bring each of the windows to the front, and uses Cmd-Tab
    o Closes the 4 applications (because I'm thinking it might use different parts of the VRAM if applications are reopened).
    o Iterate through the above steps.

    It's pretty easy to change the number of iterations (if you've some programming experience).

    I added an external monitor, and ran the switching script. I don't get hangs, but I do get:

    Dec 8 17:53:59 172 /Library/Application Support/Logitech/LCCDaemon.app/Contents/MacOS/LCCDaemon: removeDisplayMapping: _CGSUnmapFramebuffer returns -536870206

    Guinea pigs anyone?
  • Ethanee Level 2 Level 2 (350 points)
    Disclaimer: Use the script at your own risk!

    There will be some "bung" sounds when running, I think it's because the cmd-tab command is given when the process isn't ready (similar to invalid commands).

    Also, half an hour after getting the error in the log, I experienced the hang, which I have never ever gotten before.
  • Ethanee Level 2 Level 2 (350 points)
    I just submitted a bug report at bugreport.apple.com, I'll wait and see what they say...
  • Tim Bretl Level 1 Level 1 (0 points)
    I have the same problem---spinning cursor can be moved but nothing else works.

    I tried the experiment you suggested, with the same results---plug in external monitor, 2 minutes of cmd-tabs, then it freezes where the cursor can be moved but nothing else works. (But in this case, cursor is an arrow and does not spin.)

    Assuming these two problems have the same cause, do you have an answer from Apple tech support yet?

    This type of system crash is one of the things I bought a mac to avoid.

    -Tim

    Mac Book Pro   Mac OS X (10.4.8)  
  • helpful hal Level 1 Level 1 (15 points)
    From what I've heard on other posts, most problems arise from using the migration tool in Tiger. Some have fixed the problem by reformatting the hard drive and doing a new install of the OS. It's weird... I would've thought that apple had fixed that problem with the migration tool by now...
  • Paul Pedrazzi Level 1 Level 1 (15 points)
    I had the same issue. VERY frustrating.

    Mac would randomly lock up. Rainbow and all. Mouse moved, nothing else worked. Had to hold on button to reset.

    After a while I figured it was a network/airport thing.

    So I turned off Airport and plugged in via ethernet.

    NEVER had any issues since. It has been months with flawless performance. Previously, I was crashing 4-6x a day.

    Apple needs to provide a fix for this so I can use wireless again. This should be a known issue, so many people have it.
  • Ethanee Level 2 Level 2 (350 points)
    Today I found that the problem title of the bug report was changed from
    External Monitor Causing WindowServer Hangs
    to
    External Monitor Causing WindowServer Hangs (possible OpenGL wedgie)

    I didn't make that change, so I guess it means someone's looking at it, and is also able to replicate the bug. Hopefully it'll be resolved soon. In that report I also pointed to this thread...
  • George Haritonidis Level 1 Level 1 (0 points)
    Hi Hal,

    As I stated later on in the thread, this hanging still occurs even after a reformatting.

    Cheers,
    -- George
  • George Haritonidis Level 1 Level 1 (0 points)
    Ethanee, you wouldn't happen to have a link to the bug report for viewing would you?

    It would be interesting to follow this bug report and sees where it ends up...
  • Ian Searle Level 1 Level 1 (20 points)
    I've been through 2 fresh installs of Tiger and never used the migration assistant. I'm not saying the migration assistant never causes problems. It just doesn't seem to be involved in this particular problem.

    Mac OS X (10.4.8)

       
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