e
- Original Message -
From: "Brad Parker" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, March 07, 2001 3:38 AM
Subject: Re: [linux-usb-devel] BM_STS and usb
>
> David Brownell wrote:
> >> > ACPI defines processor power-saving states C0,
David Brownell wrote:
>> > ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
>> > enter C3 if there is busmastering activity, and so we check BM_STS. If thi
>s
>> > is high when it should not be, and we are therefore not using C3, we are
>> > losing battery life.
>>
>> USB
> > ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
> > enter C3 if there is busmastering activity, and so we check BM_STS. If this
> > is high when it should not be, and we are therefore not using C3, we are
> > losing battery life.
>
> USB causes continuous bus mastering
> ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
> enter C3 if there is busmastering activity, and so we check BM_STS. If this
> is high when it should not be, and we are therefore not using C3, we are
> losing battery life.
USB causes continuous bus mastering.
> 1. The
Hi all,
Problem:
We are seeing the BM_STS bit stuck at 1, when the USB driver is enabled on
Linux.
Why this is important:
ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
enter C3 if there is busmastering activity, and so we check BM_STS. If this
is high when it should not
