I recently noticed that `gkrellm` was not showing the temperatures for my drives (SATA SSD in my case).
It turns out that the 6.10 kernel updates fixed something to spec that thus broke some stuff that was depending on a non-spec output that had been going on for some time.
The kernel "regression" is shown here:
https://lore.kernel.org/all/0bf3f2f0-0fc6-4ba5-a420-c0874ef82d64@heusel.eu/
The symptom for hddtemp is that it will show "drive is sleeping" unless you give the -w switch to "wake up the drive". You would need to use that each time you query it. I guess the issue shows up in hdparm also and some other stuff. So they might back this out, but the proper fix should be to the stuff that is depending on non-spec output. Personally I am running the last 6.9 kernel and watching the updates that show up to see if a new kernel reverts this or if a new version of hdparm or hddtemp will fix it.
Posting note: Hope this does not double post. My first try was not from my fedora e-mail address.