[Bug 6108] IDE power management hang on various laptops

bugzilla-daemon at bugzilla.ubuntu.com bugzilla-daemon at bugzilla.ubuntu.com
Fri Sep 9 23:06:12 UTC 2005

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mdz at ubuntu.com changed:

           What    |Removed                     |Added
            Summary|laptop-mode hang on various |IDE power management hang on
                   |laptops                     |various laptops

------- Additional Comments From mdz at ubuntu.com  2005-09-10 00:06 UTC -------
OK, I've reproduced this problem using the following steps:

- Boot into recovery mode
- kill dhclient3 (and any other daemons which do regular disk I/O)
- hdparm -B1
- wait a while
- with the disk spun down, cause some disk I/O (I used "ls /")

Since I was on the console, I actually got some kernel messages out of this:

hda: dma_timer_expiry: dma status == 0x21
hda: DMA timeout error

so the kernel is still at least somewhat alive, and this bug is decidedly
unrelated to laptop-mode.

The obvious workaround would seem to be to disable the hdparm -B command in
acpi-support.  I assume the disk will still spin down?

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