[SOLVED] hddtemp issue with Samsung SSD 850 PRO 256G

sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

Hi,
I'm unable to fetch the temp for this SSD, it is missing from provided hddtemp.db so I created a custom one in /etc/hddtemp.db with field(190) to get the correct value but it doesn't work.

hddtemp /dev/sdk

mike155 · Posted: Sun Mar 14, 2021 2:14 am Post subject:

hddtemp doesn't seem to work for my Samsung 840 PRO either:

sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

mike155,

Alright, good to know. yes indeed, smartctl works.
I see there is a new driver in kernel to get hdd temp without installing hddtemp.

Only applies to kernel >5.6 though, I'll try that later. (I use 5.4.x)

https://www.phoronix.com/scan.php?page=news_item&px=2020-Linux-Kernel-SATA-Temps

mike155 · Posted: Sun Mar 14, 2021 4:01 am Post subject:

Yes, you're right, 'sensors' now reports the temperatures of my SSDs.

Below is what 'sensors' prints for my Samsung SSD 840 PRO Series (SATA):

sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

I installed 5.10.23 and it works fine indeed now, it shows all temps, very nice

I will probably remove hddtemp now

The only "issue" is that sensors command reports the drives as :

drivetemp-scsi-1-0
etc..
I wonder if it could show the block like /dev/sda etc.. instead or the model so I know which drive I'm looking at.

Meanwhile, this works (with model name and temp) :

fedeliallalinea · Posted: Sun Mar 14, 2021 7:27 am Post subject:

Moved from Other Things Gentoo to Kernel & Hardware.
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Anon-E-moose · Posted: Sun Mar 14, 2021 10:27 am Post subject:

hddtemp only needs a line added for any device it doesn't know, telling it where to look (typically 190) for it's value
The database (despite the name) is a text file

add this after modifying for whatever you need and it should work.

sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

Anon-E-moose,

Yes, that's what I did but it doesn't work nonetheless.
I suspect the garbage characters are causing some trouble.
This is what I get when running --debug (or not)

Anon-E-moose · Posted: Sun Mar 14, 2021 12:17 pm Post subject:

Since hddtemp uses the first part as a lookup, the odd characters would be a problem.

Does it print out the oddness with smartctl -i

If so, the do smartctl ><some file>
edit the file down to just the piece you need and put that into the db.

Note: haven't tried it, don't have a drive that reports something like that. And it may not work depending on how hddtemp "parses" the file and whether they take into account things like the odd characters.

Edit to add: reading your edit :lol:

The fix is just to chop it after the "B" character in the db ? Or is he talking about changing hddtemp itself?
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sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

sdauth · l33t Joined: 19 Sep 2018 Posts: 674 Location: Ásgarðr

Ok...

Now I feel really stupid. Forget about the patch, no need for that. (Unless you want a clean output without garbage, see -> hddtemp_model_name.patch )
The resolution was quite simple actually, I forgot to pass the -f argument to read the custom database.. I assumed hddtemp would have picked up /etc/hddtemp.db but no.. by default it reads :

Anon-E-moose · Posted: Sun Mar 14, 2021 2:03 pm Post subject:

Glad you got it working.

I used to monitor my temps all the time, but once I was sure they were staying stable, I usually just do check with smartctl when I want to know. Plus constantly monitoring the temps, at least on my nvme, caused it to run a degree hotter.
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UM780, 6.12 zen kernel, gcc 13, openrc, wayland