From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [Bugme-new] [Bug 13145] New: Processor does not go below C2 if mouse (uhci) is plugged in. Date: Tue, 21 Apr 2009 14:27:51 -0700 Message-ID: <20090421142751.b030cba7.akpm@linux-foundation.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arjan van de Ven , rui.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, shaohua.li-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, yakui.zhao-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Cc: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org, bugme-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, daniel.smoczyk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, imrehg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org List-Id: linux-acpi@vger.kernel.org (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). It looks like we need to revisit this - 2.6.26 worked OK, so why can't 2.6.28? Thanks. On Tue, 21 Apr 2009 19:53:13 GMT bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=13145 > > Summary: Processor does not go below C2 if mouse (uhci) is > plugged in. > Product: Drivers > Version: 2.5 > Kernel Version: 2.6.29 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: high > Priority: P1 > Component: USB > AssignedTo: greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org > ReportedBy: daniel.smoczyk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org > Regression: Yes > > > Created an attachment (id=21071) > --> (http://bugzilla.kernel.org/attachment.cgi?id=21071) > lsusb -v > > Latest working kernel version: > 2.6.26-13 > > Earliest failing kernel version: > 2.6.28 > > Distribution: > Debian Sid > > Hardware Environment: > IBM Thinkpad T41 Pentium M > > Problem Description: > In 2.6.28(29) kernel, when I plug in usb logitech mouse, regression in uhci (I > assume it's usb uhci driver) forces processor to operate in C2 state (reported > by powertop 1.11). When I plug it off, everything back to normal - 100% C3 in > idle. In 2.6.26 kernel processor normally goes down to C3 when mouse is plugged > in. > > I think this problem was already reported in this bug [1] and closed without > proper investigation. Arjan van de Ven stated that "When USB is used C3 cannot > be entered" argument isn't correct [2]. > > I'll provide any additional debug data if needed. > > [1] http://bugzilla.kernel.org/show_bug.cgi?id=12391 > [2] http://www.bughost.org/pipermail/power/2009-March/001617.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html