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Fighting for a better future

Jianqiu Zhang VOID001

Fighting for a better future
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fntlnz /
Last active Sep 25, 2020
Self Signed Certificate with Custom Root CA

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096
zmalltalker /
Created Jul 20, 2012
Thinkpad fan control

Thinkpad fan control

My Thinkpad T400s kept shutting down when it was busy doing CPU intensive work. It turns out that the fan did not speed up to a high enough level to cool down the CPU, and I’d find messages in /var/log/messages stating that the CPU was dangerously hot.

Load the thinkpad_acpi module with manual fan control enabled

The first thing I did was to make it possible to manually control the fan speed. In order for this to work, the thinkpad_acpi kernel module needs to be loaded with a specific parameter. This can be

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