Jarlath,
I would suggest that you do the following:
Check your bios settings. There will likely be a setting which sets the
functionality of the power button. Try some different settings here. The usual
options are Suspend to RAM or Disk, and "hold for 4 secs for hard power down",
"signal to OS for soft power down" (there maybe more options than this).
It maybe that that you are experiencing some sort of bug with regards to ACPI
support for your motherboard.
Try the debugging procedures here:
https://wiki.ubuntu.com/DebuggingACPI
If none of the above helps then file a new bug report. File it against the
Linux-source-2.6.xx (depending upon which release you are using).
Please include the information as separate attachments:
* Output of uname -a
* Output of sudo lspci -vvnn
* Output of sudo dmidecode
* Try to suspend/hibernate and then restart the system and attach
/var/log/kern.log.0
* Tarball of /proc/acpi directory. You can't just tar all files because their
content sometimes changes etc.
* cp -r /proc/acpi /tmp
* tar -cvjf ~/acpi.tar.bz /tmp/acpi
Thanks.
--
Pressing power button hangs the system with 2.6.15-20-686
https://bugs.launchpad.net/bugs/40243
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