powermac: thermal control turns system off in normal temperature conditions
PATCH 1/1 powermac: thermal control turns system off in normal temperature conditions
From: Lyonel Vincent <[email protected]>
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 <[email protected]>
---
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(-)
drivers/macintosh/therm_windtunnel.c +2 -2
@@ -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 );
Quoted 14 lines · Bartlomiej Zolnierkiewicz
From: Lyonel Vincent <[email protected]>
Subject: [PATCH] powermac: thermal control turns system off in normal temperature conditionsOn 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.creduces 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.
Quoted 2 lines
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.
Looks reasonable, thanks.
Ben.
Quoted 27 lines
From: Lyonel Vincent <[email protected]>
Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>---
Resurrected from Fedora's bugzilla (aka The Big Black Hole):
https://bugzilla.redhat.com/show_bug.cgi?id=171937The 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
===================================================================drivers/macintosh/therm_windtunnel.c +2
-2@@ -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 );
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 <[email protected]>
To: Benjamin Herrenschmidt <[email protected]>
Quoted 24 lines
From: Lyonel Vincent <[email protected]>
Subject: [PATCH] powermac: thermal control turns system off in normal temperature conditionsOn 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.creduces 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 <[email protected]>
Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>---
Resurrected from Fedora's bugzilla (aka The Big Black Hole):
https://bugzilla.redhat.com/show_bug.cgi?id=3D171937
Quoted 8 lines
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
Quoted 12 lines
drivers/macintosh/therm_windtunnel.c +2
-2@@ -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 );
Quoted 8 lines · On Mon, 2009-08-31 at 11:25 +0200, Linux User #330250 wrote:
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.
Quoted 8 lines
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.
Thanks. I think pushing them a bit like this patch does still remains within reasonably safe limits though. The CPU should cope with more hopefully :-)
But yeah, cleaning up the dust is definitely a good idea :-)
Cheers,
Ben.
Quoted 57 lines
Sorry to interrupt,
Andreas aka Linux User #330250---------- Original message ----------
Subject: [PATCH] powermac: thermal control turns system off in normal temperature conditionsDate: Sonntag, 30. August 2009N From: Bartlomiej Zolnierkiewicz <[email protected]> To: Benjamin Herrenschmidt <[email protected]>Quoted 44 lines
From: Lyonel Vincent <[email protected]>
Subject: [PATCH] powermac: thermal control turns system off in normal temperature conditionsOn 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.creduces 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 <[email protected]>
Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>---
Resurrected from Fedora's bugzilla (aka The Big Black Hole):
https://bugzilla.redhat.com/show_bug.cgi?id=171937The 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
===================================================================drivers/macintosh/therm_windtunnel.c +2
-2@@ -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 );