我发现在 ubuntu 运行过程中指纹识别单元太热（手被烫伤）。我的平台：ubuntu 16.04，Dell Vostro 3450。问题出在哪里，如何定义和修复？
输出：
lspci -k | grep -EA3 'VGA|3D|Display
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Subsystem: Dell 2nd Generation Core Processor Family Integrated
Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
Subsystem: Dell Radeon HD 6630M
Kernel modules: radeon