我在我的联想 X1 第三代上运行着 Fedora 21，我注意到该进程gnome-shell几乎一直使用 100% 的 CPU。
我发现这可能是由于缺少图形驱动程序，但事实似乎并非如此。以下是输出lspci -vnn | grep VGA -A 12：
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:2227]
Flags: bus master, fast devsel, latency 0, IRQ 52
Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
据我所知，OpenGL 也运行良好。glxinfo | grep OpenGL报告：
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.4.3
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 10.4.3
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 10.4.3
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.0