I have updated the bug description to explain the problem clearly.
** Summary changed:
- Computer with APM does not shut down.
+ SMP-enabled kernels need a APM module option to power off on APM-only systems
** Description changed:
- Binary package hint: linux-image-2.6.17-10-generic
+ On SMP-enabled kernels, the APM-based power-off is disabled
+ automatically. Starting with 6.10 (Edgy Eft), Ubuntu began to
+ ship SMP-enabled kernels as default. This has an impact on
+ people who use old computers which do not support ACPI
+ and hence rely on APM to power off automatically after halting.
- Hello,
+ There is a way to work around this problem, and that is adding
+ a file in /etc/modprobe.d/ which contains the following lines:
- My computer's does not support ACPI properly, so Linux
- uses APM. (I am certain about this.) Before upgrading to
- "Edgy Eft", I was using 6.06.1 LTS ("Dapper Drake") and
- my computer shut down properly by itself.
+ === 8< ===
+ options apm smp=1 power_off=1
+ === >8 ===
- After upgrading to "Edgy Eft" my computer does not shut
- down automatically. (E.g. I have to push the power button
- to finish the shut down sequence.)
+ This line tells the APM module to use the power off feature
+ even if the kernel is an SMP-enabled one.
- My guess is that a regression in the kernel causes this bug.
- I have not tried other kernel packages but am willing to try
- if anyone suggests a package.
+ It would be nice if Ubuntu included an appropriate file in
+ /etc/modprobe.d with the contents quoted above. This way
+ users wouldn't have to do anything special to make Ubuntu
+ power off properly on older computers which support
+ only APM.
- Thank you,
- stiuert
+ Thanks in advance,
+
+ M. Vefa Bicakci
** Tags added: kernel linux smp
** Tags removed: cft-2.6.27 edgy-close
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SMP-enabled kernels need a APM module option to power off on APM-only systems
https://bugs.launchpad.net/bugs/69880
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