Re: PROBLEM: CPU fan shuts down on load of fan.ko in kernel 2.6.18 and later

Matthew Brett
2007-01-10T01:12:29Z

Hi,

> Could you please perform the following testing:

Thanks a lot for the reply. Results of tests below. I've included
the output from the 2.6.17 kernel and 2.6.20-rc3 kernel with comments.
Patched kernel gave identical output to unpatched... CPU load did
not turn on the fan as before.

Best,

Matthew

2.6.17 kernel, fan on at boot
[root@bob ~]# cat /proc/acpi/thermal/*/*
cat: /proc/acpi/thermal/*/*: No such file or directory
[root@bob ~]# cat /proc/acpi/thermal_zone/*/*
<setting not supported>
cooling mode: passive
<polling disabled>
state: passive
temperature: -270 C
critical (S5): -264 C
passive: -273 C: tc1=0 tc2=0 tsp=600 devices=0xf7ffd340
active[0]: -267 C: devices=0xf7ffd5c0
[root@bob ~]# cat /proc/acpi/fan/*/state
status: on
[root@bob ~]# echo 3 > /proc/acpi/fan/*/state
-bash: echo: write error: Exec format error
[Fan goes off]
[root@bob ~]# echo 0 > /proc/acpi/fan/*/state
[No effect, fan stays off]
[root@bob ~]#

2.6.20-rc3 kernel, fan off at boot
[root@bob ~]# cat /proc/acpi/thermal/*/*
cat: /proc/acpi/thermal/*/*: No such file or directory
[root@bob ~]# cat /proc/acpi/thermal_zone/*/*
<setting not supported>
cooling mode: passive
<polling disabled>
state: passive active[0]
temperature: -266 C
critical (S5): -264 C
passive: -273 C: tc1=0 tc2=0 tsp=600 devices=0xc18fd2c0
active[0]: -267 C: devices=0xc18fd798
[root@bob ~]# cat /proc/acpi/fan/*/state
status: on
[root@bob ~]# echo 3 > /proc/acpi/fan/*/state
-bash: echo: write error: Exec format error
[No effect]
[root@bob ~]# echo 0 > /proc/acpi/fan/*/state
[No effect]