On Wed, Jan 10, 2018 at 04:13:51PM +0100, Takashi Iwai wrote: > Hi, > > on the recent kernels, i2c-i801 skips the creation of iTCO wdt when > ACPI WDAT is present. It's fine when ACPI really creates the watchdog > device. But, we've got a report showing that the watchdog is missing > on some machines because ACPI failed to create, and yet i2c-i801 still > skips because acpi_has_watchdog() returns true. > > More specifically, the machine gets an error from acpi_watchdog.c > like: > platform wdat_wdt: failed to claim resource 3: [io 0x040a-0x040c] > ACPI: watchdog: Device creation failed: -16 > > where the region was registered by pnp, > % cat /proc/ioports > .... > 0400-047f : pnp 00:01 > > > One may say that BIOS sucks, but OTOH, the complete lack of watchdog > thereafter can be seen as a regression, too. It used to work on the > older kernel as iTCO wdt was provided by i2c-i801.
Hmm, if the resource is already taken I wonder how iTCO can work? Are you sure iTCO works on those systems? > Shouldn't acpi_has_watchdog() rather checks whether the watchdog > device creation succeeded or not? Yes, or rather we should first figure out what the actual problem is ;-) Are you able to get acpidump from that system with full dmesg?
