刷新频率，液晶屏好像没什么选择，以前用crt时，选项比较多。

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
1366x768 60.0*+
1360x768 59.8 60.0
1024x768 60.0 60.0
960x720 60.0
928x696 60.1
896x672 60.0
960x600 60.0
960x540 60.0
800x600 60.0 60.3 56.2
840x525 60.0 59.9
800x512 60.2
700x525 60.0
640x512 60.0
720x450 59.9
640x480 60.0 59.9
680x384 59.8 60.0
576x432 60.1
512x384 60.0
400x300 60.3 56.3
320x240 60.1