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Laptop starts overheating if secure boot is enabled

cn flag

After spending hours to fix the overheating problem on my laptop running Ubuntu 20.04, I've figured it out is that all I have to do is to disable Secure Boot, the temp went down tremendously from 90~100+ oC to

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +56.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +54.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +56.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +52.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +52.0°C  (high = +100.0°C, crit = +100.0°C)

However, I still want to enable Secure Boot while keeping my laptop from overheating, as disabling it could leave my laptop vulnerable to malware. Could you guys please give me some diagnoses and advice for this problem?

David avatar
cn flag
What version of Ubuntu and is it up to date?
Cường Nguyễn avatar
cn flag
@David 20.04, and yes it's up to date
David avatar
cn flag
Please edit the question and include this info.
Cường Nguyễn avatar
cn flag
@David I have edited the question
darth_epoxy avatar
nl flag
You may have special drivers for your fan hardware. These drivers in Ubuntu are normally unsigned. If secure boot is enabled, and the drivers are not signed, these drivers will not load, hence the overheating. In order for them to load, each driver must be "signed". This process of signing the drivers is not extremely difficult, but it can be a hassle... especially if you change/update the driver, or change/update the kernel software that is a part of Ubuntu. Old but good info here https://askubuntu.com/questions/843656/is-it-safe-to-disable-secure-boot
Cường Nguyễn avatar
cn flag
@darth_epoxy thanks for the info!
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