From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: RE: "TSC cannot be used as a timesource" when on battery Date: 11 Mar 2004 02:14:41 -0500 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1078989281.2549.99.camel@dhcppc4> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Ow Mun Heng Cc: "Acpi-List (E-mail)" List-Id: linux-acpi@vger.kernel.org Does /proc/acpi/processor/CPU0/power show any usage in C3? I believe there is a bugfix in the pipeline regarding local APIC timer slowing down in C3. The fix is to disable C3 -- the workaround is to use another timer. cheers, -Len On Thu, 2004-03-11 at 00:21, Ow Mun Heng wrote: > > -----Original Message----- > > From: Ow Mun Heng > > Sent: Monday, March 01, 2004 10:39 AM > > To: Acpi-List (E-mail) > > Subject: [ACPI] "TSC cannot be used as a timesource" when on battery > > > > > > Hi All, > > > > D600 + RH9 + kernel 2.6.3+acpi20040211 > > > > Was seeing these error messages when booting from battery. > > I've searched through google and the only thing It came up with > > was a reference that asks to use ACPI PM as the timesource. > > > > I'm currently using RTC (real time clock) > > > > I'm still trying to figure out what is the difference between ACPI > > PM timesource/RTC. > > > > I've not investigated further to determine if my clock is indeed > > running slower. > > > > ====start kernel message======= > > TSC cannot be used as a timesource. > > <4> Possible reasons for this are > > You're running with speedstep > > You don't have DMA enabled for your hard drive (See hdparm) > > Incorrect TSC synchronization on an SMP system (dee dmesg) > > Falling back to sane timesource now. > > =======end kernel messages========== > > > > HDparm shows all my hd and cdrom are on dma > > This is uniprocessor laptop > > > > Yes.. running on speedstep. > > When on AC power, I don't see this error. > > Sent this to the list a while back.. I've not > seen any responses. So, asking again, just in case it > was missed (busy schedules etc) > > I don't really think it's an issue.. but still would like > to know what is triggering it. > > Thanks, > Ow > > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: IBM Linux Tutorials > Free Linux tutorial presented by Daniel Robbins, President and CEO of > GenToo technologies. Learn everything from fundamentals to system > administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click > _______________________________________________ > Acpi-devel mailing list > Acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > https://lists.sourceforge.net/lists/listinfo/acpi-devel ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click