There is already a pretty good Arch wiki article:
Which already does a decent job explaining what it is and why we want to disable it:
As well as a few ways to disable the watchdog(s)
The problem is that this is not at all an exhaustive list of possible watchdog modules.
One appendix that can be useful is found here:
But even that does not cover all possible watchdog modules.
So here I will attempt to provide a few steps to find and disable any watchdogs that just “arent like the other modules.”
You will notice there are some common features of watchdog modules - namely titles including some assortment of “TC”, “TCO”, “WD”, or “WDT”, in varying upper and lower cases.
My suggestion would be to query modules, sorting them by those clues:
lsmod | grep -i tc lsmod | grep -i wd
Some modules may appear self-explanatory, and others less so.
See this example:
$ lsmod | grep wd snd_hwdep 12288 1 snd_hda_codec snd 126976 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm wdat_wdt 16384 0
In this case
wdat_wdt seems a likely candidate.
We can use
modinfo to provide more details.
$ modinfo wdat_wdt filename: /lib/modules/6.5.4-AMD-znver3/kernel/drivers/watchdog/wdat_wdt.ko.xz alias: platform:wdat_wdt license: GPL v2 description: ACPI Hardware Watchdog (WDAT) driver author: Mika Westerberg <email@example.com> srcversion: 2D87893F9044A672B7B6A81 depends: retpoline: Y intree: Y name: wdat_wdt vermagic: 6.5.4-AMD-znver3 SMP preempt mod_unload modversions parm: nowayout:Watchdog cannot be stopped once started (default=0) (bool) parm: timeout:Watchdog timeout in seconds (default=30) (int)
The extra information verifies this module as a watchdog, and thus, fit for blacklisting.
# watchdog blacklist sp5100_tco # extra watchdog blacklist wdat_wdt