[ltp] RE: [ACPI] fan always on: ACPI on IBM ThinkPad R51

[linux-thinkpad@linux-thinkpad.org]

Thank you for this info.

I opened the laptop and found a three wire connector to the fan, wich
usually means speed control by BIOS. Disconnecting the fan, a "Fan
failure" appears and booting process stops. So I supose the fan speed
and switches are controlled by non-ACPI parts of the BIOS.

In this case, adding a fan device in the dsdt could make ACPI handle the
fan?
Is this possible, or the only way is to modify the BIOS?

Suso.



O 31/8/2004, "Wang, Zhenyu Z" <zhenyu.z.wang@intel.com> escribiu:

>There is no fan device in your dsdt. That means ACPI fan driver couldn't
>handle it.
>
>-----Original Message-----
>From: acpi-devel-admin@lists.sourceforge.net [mailto:acpi-devel-admin@lists.=
sourceforge.net] On Behalf Of susinho@ultreia.org
>Sent: 2004=1B$BG/=1B(J8=1B$B7n=1B(J31=1B$BF|=1B(J 23:07
>To: acpi-devel@lists.sourceforge.net
>Subject: [ACPI] fan always on: ACPI on IBM ThinkPad R51
>
>Hi all. This is my first message to this list.
>
>I recently owned an IBM Thinkpad R51 1830-BG8 (P Mobile 1.5 with ATI
>Radeon M 7500). After wiping the XP thingie, I installed a GNU/ Linux
>Debian (sarge) and all works *fine* except the cooling fan, wich is
>always on making a really anoying noise: after started at 39 C the fan
>doesn't stop, even when the machine doing nothing.
>
>The first thing I tryed was to update the BIOS from 3.05a (the original
>one shipped with the machine) to 3.06f wich theoretycally fixes the fan
>noise problems. But the behaviour of the machine was exactly the same
>after the BIOS update. I uploaded both (buggy) IBM original DSDTs for
>reference:
>
>http://acpi.sourceforge.net/dsdt/tables/IBM/R51_1830-BG8/IBM-R51_1830-BG8-3.=
05a-original.asl.gz
>http://acpi.sourceforge.net/dsdt/tables/IBM/R51_1830-BG8/IBM-R51_1830-BG8-3.=
06f-original.asl.gz
>
>following the HOWTOs, I fixed the last one (I don't understand what I
>did, but at least iasl says no errors and no warnings after the fix). I
>included the hex table in the kernel, but after sucesfully loaded, the
>behaviour still remains the same one. Also I tryed this modified version
>of the 3.03 BIOS DSDT
>
>http://acpi.sourceforge.net/dsdt/tables/IBM/R51/IBM-R51-3.03-custom.asl.gz
>
>, but my machine reboots as critical trip points appears to be set to
>-273 C.
>
>I did all my tests with 2.6.6, 2.6.7 and 2.6.8 debian patched kernels.
>The system manually suspends ok (to memory and disk with swsusp2).
>Cpufreq works ok, with powernowd the processor is always at the minimum
>frecuency (600000 MHz) and C3 state. Setting the throttling to 7
>doesn't changes nothing (well, the machine goes slowly, but the fan is
>still on). The only hot chip is the graphics one, now managed by the
>radeonfb driver: but it is hot anyway, even without kernel support,
>without AGP and DRI, X or text mode.
>
>I was reading the ACPI spec in the thermal side, but modifying passive
>trip points has no effect, and active cooling mode doesn't appear to be
>available, I don't know how to activate it. Also the /proc/acpi/fan/
>directory is empty.
>
>cat /proc/acpi/thermal_zone/THM0/trip_points (only shows THM0)
>critical (S5):           94 C
>passive:                 92 C: tc1=3D5 tc2=3D4 tsp=3D600 devices=3D0xdfe2e22=
8
>
>cat /proc/acpi/thermal_zone/THM0/cooling_mode
>cooling mode:            passive
>
>So, does anyone of you know how can I modify the fan starting/ stopping
>points? Is it a lack of the ACPI support, or perhaps a fix to be done in
>the DSDT definition? both?
>
>thank you.
>
>
>-------------------------------------------------------
>This SF.Net email is sponsored by BEA Weblogic Workshop
>FREE Java Enterprise J2EE developer tools!
>Get your free copy of BEA WebLogic Workshop 8.1 today.
>http://ads.osdn.com/?ad_idP47&alloc_id=10808&op=3Dick
>_______________________________________________
>Acpi-devel mailing list
>Acpi-devel@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/acpi-devel
>
>
>-------------------------------------------------------
>This SF.Net email is sponsored by BEA Weblogic Workshop
>FREE Java Enterprise J2EE developer tools!
>Get your free copy of BEA WebLogic Workshop 8.1 today.
>http://ads.osdn.com/?ad_id=3D5047&alloc_id=3D10808&op=3Dclick
>_______________________________________________
>Acpi-devel mailing list
>Acpi-devel@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/acpi-devel