https://bugzilla.kernel.org/show_bug.cgi?id=203191 --- Comment #7 from Matthias Schiffer (mschiffer@xxxxxxxxxxxxxxxxxxxx) --- The T470 (without the 's' suffix) is affected as well. Still reproducible with the latest BIOS 1.65 and Linux 5.11.6. I believe the issue is not directly related to suspend/resume, as I don't use suspend. Instead, the fan control can break any time the fan is supposed to spin up, which may be when waking up from suspend, or simply because of increased CPU workload. Whenever the systems gets into the broken state: - the fan is not spinning at all - hwmon and /proc/acpi/ibm/fan report 65535 RPM - manual control via /proc/acpi/ibm/fan is ignored (Note: I normally don't use this interface, but rely on the builtin fan control) - only a full poweroff will fix the issue. When attempting to reboot without a poweroff, the BIOS will refuse to boot with a "Fan error" message. As far as I remember, the issue originally started when Lenovo fixed a BIOS issue that caused the fan to hang at 100% after suspend occasionally a few years ago. I'd be happy to provide any information that may help fix this issue, as I'm seeing it pretty much daily. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
