On Wed, 6 Feb 2013, Jean Delvare wrote:
On Wed, 6 Feb 2013 15:00:58 +0100 (CET), Dag Wieers wrote:
On Wed, 6 Feb 2013, Jean Delvare wrote:
Not good. This can mean one of two things: either the chip has no
register 0x3f and it nacks non-existent register read attempts, or it
doesn't support SMBus read byte transactions at all. In the latter
case, I strongly suggest that you leave the chip alone. As for the
former case, there are a few thermal sensor chips which behave like,
don't have a register at 0x3f and can use slave address 0x48: DS1621
and similar, DS75, LM73.
It now consistently returns 0x3d, could this be a thermal value, like 61°C ?
Could be, but for now all I see is that 0x3d == 0x3f - 0x02, i.e. only
one bit changed. You will need to take more samples before you can draw
a conclusion. Also compare when CU is idle and when it's busy.
So I have been reading out different values over time, but when
repeatedly asked it provides the same value:
----
root ~ # i2cget 0 0x48
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, current data
address, using read byte.
Continue? [Y/n]
0x3d
root ~ # gputemp
46 C
----
----
root ~ # i2cget 0 0x48
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, current data
address, using read byte.
Continue? [Y/n]
0x43
root ~ # gputemp
52 C
----
----
root ~ # i2cget 0 0x48
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, current data
address, using read byte.
Continue? [Y/n]
0x4b
root ~ # gputemp
58 C
----
It pretty much looks like a thermal sensor, much in sync with the GPU
temperature. How would I continue ?
--
-- dag wieers, dag@xxxxxxxxxx, http://dag.wieers.com/
-- dagit linux solutions, info@xxxxxxxxx, http://dagit.net/
[Any errors in spelling, tact or fact are transmission errors]
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