From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruno Ducrot Subject: Re: ACPI throttling to death? Date: Fri, 8 Apr 2005 12:10:28 +0200 Message-ID: <20050408101028.GH2298@poupinou.org> References: <200504042214.15648.jfrey@gmx.de> <200504052223.17547.jfrey@gmx.de> <20050406141923.GZ2298@poupinou.org> <200504081153.30624.janfrey@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <200504081153.30624.janfrey-S0/GAf8tV78@public.gmane.org> Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Jan Frey Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Fri, Apr 08, 2005 at 11:53:30AM +0200, Jan Frey wrote: > Hi, > > this notebook seems to use C2 nearly all the time: > > active state: C2 > default state: C1 > bus master activity: 00000000 > states: > C1: promotion[C2] demotion[--] latency[000] > usage[00007950] > *C2: promotion[--] demotion[C1] latency[020] > usage[00742673] > C3: > > Hey, yet another fascinating finding: > cat /proc/acpi/processor/CPU0/throttling > state count: 16 > active state: T0 > states: > *T0: 00% > T1: 06% > T2: 12% > T3: 18% > T4: 24% > T5: 31% > T6: 37% > T7: 43% > T8: 49% > T9: 55% > T10: 62% > T11: 68% > T12: 74% > T13: 80% > T14: 86% > T15: 93% > > Now I did: echo 14 >/proc/acpi/processor/CPU0/throttling > what resulted in sever slow down of the machine. And then: > echo 15 >/proc/acpi/processor/CPU0/throttling > really caused the machine to hang!! So it seems to be T15 state that > "kills" the machine!? > > Two questions: > a) why does it get so hot that even throttling does not help? (It does not > do so running Win2k) My only guess is that C2 is broken in the sense that the northbridge and/or the southbridge are not configured properly. Unfortunately, I don't have access to VIA datasheets (I've tryed two times in the past. Never got even a single answer). > b) why does it die in T15? single copy and past of one of an early email: > > I remember that some southbridge are broken, though I'm only aware > > problem with some PIIX4 (it is in an errata, I don't remember exactly > > which version). Maybe its the case here? > > Does your laptop hang if forcing throttling level at 12%? So I guess we have to implement a little quirk in order to not allow T15 for that ALi southbridge... Cheers, -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click