From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Peres Subject: Re: Low power operational mode of nv50 Date: Sat, 22 Jan 2011 12:49:28 +0100 Message-ID: <4D3AC448.5040200@free.fr> References: <4D3ABBD6.1070509@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15"; Format="flowed" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <4D3ABBD6.1070509-S0/GAf8tV78@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nouveau-bounces+gcfxn-nouveau=m.gmane.org-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Errors-To: nouveau-bounces+gcfxn-nouveau=m.gmane.org-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org Le 22/01/2011 12:13, Jan Kiszka a =E9crit : > Hi, > > what are the missing bits to get nv50-class hardware into lowest power > mode? Even when clocking down to perflvl 0, the GPU temperature of my > Quadro FX 880M is still quickly climbing until it reaches 60 =B0C and the > fan goes on for a while (I tried up to 2.6.38-rc1 so far - any progress > in nouveau-next?). This is not only annoying but also sucking several > watts more than what is feasible - unfortunate for mobile operation. > > The benchmark is still the blob which runs the card at level 0 around 54 > =B0C, and that means fan-less. But as the blob is causing increasing > troubles across suspend/resume, not to speak of all its other > limitations. So I'd rather like to switch ASAP now. > > What may cause this different power consumption? As the clocking is > apparently the same (the blob even claims to use a few more MHz), I was > wondering if the less sophisticated firmware of nouveau could be the > reason. Or is the host driver keeping the GPU too busy even in idle state? > > Is there anything I could do to help analyzing or even resolving this iss= ue? > > Thanks, > Jan Hi, To put it simply, I have no idea :s I spotted some strange behaviour = (that could indicate some power management) when tracing the kernel but = my attempts to mimic it led to ..... 0.1W less (I guess it's just noise). I must admit I'm not working enough on it yet, this is because I would = like to get safe recloking and fan management out of the door before = looking at real power management, but if you have some knowledge in the = field, I would love if you could give me a hand on this :) I'm pretty sure the difference in power consumption is due to un-needed = engines running. I may have a look at it this week as I'll be away from = my desktop computer. Anyway, I'll be in Germany next week, are you living close to Bochum? We = could talk about this if you want/can. Take care, Martin