Hi,

I have supermicro x8sil-f (latest bios/ipmi fw) with 2 fans and it has started
to beep after a while when OS is up while it detected non-existing fans either
run at 0 RPM or in -2560 RPM.

OpenBSD itself used to detect both fans (though lm1.fanX numbers were different
to numbering from motherboard vendor).

I replugged both fans on the board and OpenBSD has detected only one fan now.
Why only one now, if it used to previously detected both?

# sysctl hw.sensors.lm1 | grep fan ; ipmitool -I lanplus -H 192.168.1.250 -U 
ADMIN -P **** sensor list | grep '^FAN [1-2]'
hw.sensors.lm1.fan1=1028 RPM
FAN 1            | 955.000    | RPM        | ok    | 215.000   | 400.000   | 
585.000   | 29260.000 | 29815.000 | 30370.000
FAN 2            | 1325.000   | RPM        | ok    | 215.000   | 400.000   | 
585.000   | 29260.000 | 29815.000 | 30370.000

Could it be possible that openbsd lm driver messes something on the board
and makes the board think a non-existing fan runs -2560 RPM or 0 RPM?

After fans replug and OpenBSD detected only one fan, the board hasn't
started to beep yet. I don't get it...

OpenBSD 6.2-current (GENERIC.MP) #399: Fri Feb  2 18:28:58 MST 2018
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8564375552 (8167MB)
avail mem = 8297881600 (7913MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.6 @ 0x9f000 (68 entries)
bios0: vendor American Megatrends Inc. version "1.1" date 05/27/2010
bios0: Supermicro X8SIL
...
wbsio0 at isa0 port 0x2e/2: W83627DHG rev 0x25
lm1 at wbsio0 port 0xa10/8: W83627DHG

Thank you for a tip or workaround.

Jiri

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