From: Len Brown <len.brown@intel.com>
To: Tomas Szepe <szepe@pinerecords.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.{9,10}: C3 not working once USB driver gets loaded (ThinkPad T40p)
Date: 27 Dec 2004 21:39:25 -0500 [thread overview]
Message-ID: <1104201565.18173.36.camel@d845pe> (raw)
In-Reply-To: <20041226205053.GA27671@louise.pinerecords.com>
On Sun, 2004-12-26 at 15:50, Tomas Szepe wrote:
> Hi,
>
> In recent kernels (tried 2.6.9, 2.6.10), after I load the uhci_hcd
> module, the processor never goes to state C3. Unloading the module
> again puts things back to normal. The system is an IBM ThinkPad T40p.
>
> Is the USB driver setting some kinda flag in the ACPI subsystem to
> achieve this behavior intentionally or is this a bug?
It is not a Linux bug -- it is a system hardware architecture flaw.
There is a workaround for this issue called
USB Selective Suspend, which you can google and
read all about. Hopefully we'll have this workaround
available on Linux systems before too long.
cheers,
-Len
prev parent reply other threads:[~2004-12-28 2:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-26 20:50 2.6.{9,10}: C3 not working once USB driver gets loaded (ThinkPad T40p) Tomas Szepe
2004-12-28 2:39 ` Len Brown [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1104201565.18173.36.camel@d845pe \
--to=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=szepe@pinerecords.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox