Public bug reported:
I have like many others experienced random freezes on Hardy Heron. I
have noticed a pattern related to the freezes that I thought I should
report.
1) The lockup lasts for about 4 minutes every time. During the freeze,
the panel clock is also frozen and will always jump 4 minutes when the
lockup is over. Since the timescale of the freeze is so predictable, I
thought maybe the problem can be narrowed down by considering time
limits or fixed maxima of iterations in the kernel?
2) The lockup happens with or without user activity, like when I am not
interacting with the computer for a few minutes.
3) The lockup is always in companion with a firmware error in the
ipw2200 wireless. However, I am not sure about cause and effect of this
4) booting with noapic option has no effect
5) I have noticed that the freeze at least sometimes comes in companion
with a cronjob
6) when the freeze is over, many (but I think not all) of the keys I
have pressed and the movement of the mouse I have done during the freeze
is processed rapidly.
Some things I have tried:
uninstalling powernowd reduced the frequency of the lockups
running dosbox reduces the frequency of the lockups
Ctrl-Alt-F1 or Ctrl-Alt-Backspace does not work during the freeze, and is not
processed after the freeze.
I have prepeared attachments which I will upload. dmesg and syslog was
taken directly after a freeze, and I have inserted some comments. I
attach syslog because it shows the cronjob entry.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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random freezes lasting approximately 4 minutes on intel 915GM
https://bugs.launchpad.net/bugs/279424
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