Re: Missing fan speed readout for ASUS M5A97 EVO R2.0 motherboard

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Hi Rune,

On Thu, 6 Feb 2014 18:25:43 +0100, Rune Kjær Svendsen wrote:
> Here you go:
> 
> root@rune-desktop:~# rmmod it87 root@rune-desktop:~# rmmod it87 Error:
> Module it87 is not currently loaded root@rune-desktop:~# isadump -k
> 0x87,0x01,0x55,0x55 0x2e 0x2f 0x07 WARNING! Running this program can cause
> system crashes, data loss and worse! I will probe address register 0x2e and
> data register 0x2f. Probing bank 7 using bank register 0x07. Continue?
> [Y/n] 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: 00 00 00 00 00 00 00 07 00 00 00
> 00 00 00 00 00 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20: 87
> 21 03 00 00 80 98 09 c0 00 00 00 9f 00 00 00 30: 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 0f 40 00 00
> 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 04 00 00 00 00 00 00 00 00
> 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 01 88
> 40 00 00 00 00 00 01 80 40 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 27 27 27 c4 3e 3e 0c f0:
> 00 00 00 00 00 00 00 00 00 00 00 00 fb 00 00 00 root@rune-desktop:~#
> isadump 0x295 0x296 WARNING! Running this program can cause system crashes,
> data loss and worse! I will probe address register 0x295 and data register
> 0x296. Continue? [Y/n] 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: 19 00 b7 02 00
> 00 00 00 00 80 58 0f 07 38 c4 86 10: 0c 6a 09 77 c7 00 00 00 04 02 03 fa 3d
> c3 c3 c3 20: e5 e7 73 86 39 cd 10 19 8a 29 22 80 80 f0 ad ad 30: af 65 69
> da 32 ee 92 6d 87 be 4a 1a 6f 00 0a 57 40: 6f f8 e7 68 63 85 5f 40 ad 6a d4
> 00 ff ff ff ff 50: 2f 18 7f 7f 7f 40 00 00 90 00 38 12 60 00 00 00 60: 80
> 00 7f 00 00 41 00 ff 7f 7f 7f 80 00 00 00 ff 70: 80 00 7f 8a 00 41 00 ff ff
> ff ff ff ff ff ff ff 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 d1 02 fc
> 90: ff 00 00 00 ff 00 00 00 ff ff ff ff ff ff ff ff a0: ee 0b 0b 0b 0b 0b
> 0b ff ff ff ff ff ff ff ff ff b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff d0: ff ff ff ff
> ff ff ff ff ff ff ff ff ff ff ff ff e0: ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff ff ff f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 
> Hope it helps.

Hmm, next time, please disable HTML and line wrapping ;-)

Anyway... Some register values are unexpected. The fan4 and fan5 input
pins are shared with the second serial port (COM2) so you can't have
both. As there is no COM2 on the Asus M5A97 EVO R2.0, I'd expect these
shared pins to be set to the fan input mode, which according to the
datasheet is the default. However 4 of the 6 COM2 pins are used for the
COM2 function (one of which has fan4 input as its alternative
function.) I'd expect that neither or all are set... Enabling only some
of them makes no sense to me - even less so when the board has no COM2
to start with.

This could be a BIOS bug so I encourage you to check your BIOS version
and see if Asus as an update available.

At least the fan5 input is selected. However monitoring is disabled for
that input, which is why the it87 driver does not provide any value for
it. We could try enabling it and see if the it87 driver then provides a
valid value for it.

This would be done with the following commands:
# rmmod it87
# isaset 0x295 0x296 0x0c 0x27
# modprobe it87

After that you should see fan5. It may or may not display a proper
value.

-- 
Jean Delvare
http://jdelvare.nerim.net/wishlist.html

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