From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.gmx.net (mail.gmx.net [213.165.64.20]) by bilbo.ozlabs.org (Postfix) with SMTP id 333E5B7B9D for ; Mon, 31 Aug 2009 19:32:48 +1000 (EST) From: "Linux User #330250" To: linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH] powermac: thermal control turns system off in normal temperature conditions Date: Mon, 31 Aug 2009 11:25:55 +0200 References: <200908302054.20498.bzolnier@gmail.com> In-Reply-To: <200908302054.20498.bzolnier@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Message-Id: <200908311125.56066.linuxuser330250@gmx.net> Cc: Bartlomiej Zolnierkiewicz List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hello! =46irst: I'm just a user. And I hope I don't cause disturbance. I've read about this when I was setting up Linux on my Power Mac G4 MDD abo= ut=20 two years ago and I remember reading that the temperature might be reported= =20 falsely. The original author reduced the limits to be on the safe side. While Mac OS X seems to push the allowed temperature more to the limits, it= =20 could still be fatal to trust the reported temperatures. My machine had the same shut-downs due to temperature at first. Since my MD= D=20 was quite a few years old when I got it I cleaned the CPUs and used new=20 thermal compound with the original heatsink. This fixed the "overheat" issu= e=20 for me. Sorry to interrupt, Andreas aka Linux User #330250 =2D--------- Original message ---------- Subject: [PATCH] powermac: thermal control turns system off in normal=20 temperature conditions Date: Sonntag, 30. August 2009N =46rom: Bartlomiej Zolnierkiewicz To: Benjamin Herrenschmidt > From: Lyonel Vincent > Subject: [PATCH] powermac: thermal control turns system off in normal > temperature conditions > > On certain PowerMacs, a module (therm_windtunnel) controls various > thermal settings (it can report CPU/case temperature, change speed > of internal fans, etc.) > > By default, the hardware thermal control has a temperature limit to > protect the computer from damages (the default limit seems to be 80=B0C) > but therm_windtunnel.c reduces it to an anormaly low value (65=B0C), > which means that he computer will shut down randomly when hit by direct > sun light or during summer (summer in France can be quite hot), actually > possibly losing data instead of protecting it. > > The overheat limit in therm_windtunnel.c:253-254 should be set to 75=B0C > and 70=B0C instead of 65=B0C and 60=B0C respectively. > > From: Lyonel Vincent > Signed-off-by: Bartlomiej Zolnierkiewicz > --- > Resurrected from Fedora's bugzilla (aka The Big Black Hole): > https://bugzilla.redhat.com/show_bug.cgi?id=3D171937 > > The patch itself seems perfectly valid to me > (especially given comments in therm_windtunnel.c). > > drivers/macintosh/therm_windtunnel.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > Index: b/drivers/macintosh/therm_windtunnel.c > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- a/drivers/macintosh/therm_windtunnel.c > +++ b/drivers/macintosh/therm_windtunnel.c > @@ -239,8 +239,8 @@ setup_hardware( void ) > * to be on the safe side (OSX doesn't)... > */ > if( x.overheat_temp =3D=3D (80 << 8) ) { > - x.overheat_temp =3D 65 << 8; > - x.overheat_hyst =3D 60 << 8; > + x.overheat_temp =3D 75 << 8; > + x.overheat_hyst =3D 70 << 8; > write_reg( x.thermostat, 2, x.overheat_hyst, 2 ); > write_reg( x.thermostat, 3, x.overheat_temp, 2 );