Ok, thanks for a hint. Found Intel Management Engine Firmware 8.1 for my lenovo x230t, installed it on Windows 7, rebooted into Ubuntu, but bug is still present, same as it was before.
Ok, thanks for a hint. Found Intel Management Engine Firmware 8.1 for my lenovo x230t, installed it on Windows 7, rebooted into Ubuntu, but bug is still present, same as it was before.