Messages in this thread | | | Date | Sat, 19 Sep 2009 11:15:53 -0700 (PDT) | Subject | Re: Linux not shutting down all devices? Battery drain in after shutdown | From | Daniel J Blueman <> |
| |
On Sep 17, 1:30 pm, Norbert Preining <preining@logic.at> wrote: > Dear all, > > I have a very strange problem with my Sony VAIO Z11 laptop. When I turn > it off in Linux it still drains battery, and quite a lot indeed, several > percent per hour.
As there is potential for broken BIOS/firmware to be mis/reprogramming hardware at shutdown time, can you check with booting the kernel with 'reboot=pci' before shutting down?
This has the excellent effect on my Thinkpad T400 of avoiding a 9 second hang when powering off or rebooting [1], making it faster than bootup (as it should be), though I haven't done any battery draining measurements yet...
If code is being executed by the BIOS to reprogram devices, that 9 second hang may be due to timeouts when hardware isn't in the expected state even.
I wonder if windows quiesces all devices and uses the pci poweroff/ reboot method or the keyboard controller method.
Daniel
--- [1]
http://groups.google.com/group/linux.kernel/browse_thread/thread/90f916ad67d5e7d3/f81bfd6af01fafb6?lnk=gst&q=blueman#f81bfd6af01fafb6 -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |