Hello! First: 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 about two years ago and I remember reading that the temperature might be reported 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 could still be fatal to trust the reported temperatures. My machine had the same shut-downs due to temperature at first. Since my MDD was quite a few years old when I got it I cleaned the CPUs and used new thermal compound with the original heatsink. This fixed the "overheat" issue for me. Sorry to interrupt, Andreas aka Linux User #330250 ---------- Original message ---------- Subject: [PATCH] powermac: thermal control turns system off in normal temperature conditions Date: Sonntag, 30. August 2009N From: Bartlomiej Zolnierkiewicz <bzoln...@gmail.com> To: Benjamin Herrenschmidt <b...@kernel.crashing.org> > From: Lyonel Vincent <lyo...@ezix.org> > 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°C) > but therm_windtunnel.c reduces it to an anormaly low value (65°C), > 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°C > and 70°C instead of 65°C and 60°C respectively. > > From: Lyonel Vincent <lyo...@ezix.org> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzoln...@gmail.com> > --- > Resurrected from Fedora's bugzilla (aka The Big Black Hole): > https://bugzilla.redhat.com/show_bug.cgi?id=171937 > > 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 > =================================================================== > --- 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 == (80 << 8) ) { > - x.overheat_temp = 65 << 8; > - x.overheat_hyst = 60 << 8; > + x.overheat_temp = 75 << 8; > + x.overheat_hyst = 70 << 8; > write_reg( x.thermostat, 2, x.overheat_hyst, 2 ); > write_reg( x.thermostat, 3, x.overheat_temp, 2 ); _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
