Re: Boot problems with - cannot smoothly boot on battery

From: H. Peter Anvin
Date: Sun May 24 2009 - 17:21:04 EST

Rafael J. Wysocki wrote:
> On Monday 18 May 2009, Chris Howie wrote:
>> Folks:
>> I've been running for some time and reported an issue to this
>> mailing list a while ago about the boot process. I believe I have now
>> nailed down the one factor that determines whether I see this issue.
>> The problem arises only when booting or halting my laptop when there
>> is no power plugged in, e.g. the system is running on battery.
>> Sometime after init begins starting services I must hold down a key on
>> the keyboard to convince it to continue booting, otherwise it just
>> hangs. If the system is running on AC then it boots fine. This same
>> problem repeats itself during the halt process if running on battery.
>> This also happens when resuming a suspend-to-disk image, after loading
>> the data from the hard drive, but before control is returned to
>> userspace. The keyboard has no effect on this hang, presumably
>> because the kernel is not listening to the keyboard at this point.
>> When this happens the only solution is to hold the power button and
>> boot normally instead.
>> An issue like this is a serious usability problem for me. I am
>> neither a kernel developer nor hacker, my coding skills applying
>> mostly to userspace applications. If there is anything you need from
>> me to help diagnose this problem please let me know.
>> I am not subscribed so please CC me on replies.
> Let's try to make your report a bit more visible (some CCs added).

I presume it boots with "acpi=off"?


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at