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From: Jean Delvare <>
To: "Rafael J. Wysocki" <>
Cc: Len Brown <>,,
	Wim Van Sebroeck <>,
	Guenter Roeck <>,,
	Mika Westerberg <>,
	Tom Abraham <>
Subject: Forcing non-ACPI watchdog driver
Date: Wed, 05 Feb 2020 16:05:29 +0100
Message-ID: <> (raw)

Hi all,

Is there a way to prevent the ACPI WDAT watchdog interface from being
used and force the use of a native watchdog driver instead?

I have a customer who reports a regression on kernel upgrade. Old
kernel (v4.4) uses iTCO_wdt and watchdog works, new kernel (v4.12) uses
wdat_wdt and watchdog doesn't work (instant reboot when opening the
device). While I'm going to look for fixes to backport, I think it
would be pretty convenient to have a way to just revert to the working
driver until the new driver is fixed somehow. But I can't see any way
to do that at the moment, short of disabling ACPI completely, which is
definitely too extreme to be considered.

Am I missing something?

Jean Delvare
SUSE L3 Support

             reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-05 15:05 Jean Delvare [this message]
2020-02-05 15:24 ` Mika Westerberg
2020-02-05 16:30   ` Guenter Roeck
2020-02-05 16:38     ` Mika Westerberg
2020-02-06 14:45       ` Jean Delvare
2020-02-06 14:56         ` Mika Westerberg
2020-02-06 15:50           ` Rafael J. Wysocki
2020-02-06 16:00             ` Rafael J. Wysocki
2020-02-06 19:14               ` Mika Westerberg

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