There is a bug-report on launchpad which fits your tablet/laptop observation problem.
Reading through this, there are several suggestions, for example
- In your BIOS - make sure you are using the latest BIOS version (see the Vendor website for any updates
- Also in your BIOS - look for "Advanced Thermal Management" - Set this to "Balanced" rather than "Maximum"
- Look at installing the package "thinkfan" from the repositories - NOTE THE WARNING IN THE BUG REPORT - read the documentation first, as incorrect usage can cause serious damage
- Take a close look at your fans - clean out any dust etc