这是dmesg显示的问题
$ sudo dmesg | grep error
[...]
[ 7.792141] i915 0000:00:02.0: Direct firmware load for i915/bxt_dmc_ver1_07.bin failed with error -2
[...]
[ 11.977510] r8169 0000:04:00.0: Direct firmware load for rtl_nic/rtl8168g-2.fw failed with error -2
系统日志中显示相同的内容：
$ sudo cat /var/log/syslog | grep error
Nov 24 02:47:36 minibip kernel: [ 6.546435] i915 0000:00:02.0: Direct firmware load for i915/bxt_dmc_ver1_07.bin failed with error -2
Nov 24 02:47:37 minibip kernel: [ 9.699957] r8169 0000:04:00.0: Direct firmware load for rtl_nic/rtl8168g-2.fw failed with error -2
... …