# 使用modeline强制屏幕分辨率

OS：ubuntu 12.04

## 生成Modeline

cvt 1440 900 60  #命令格式：横向分辨率  纵向分辨率  刷新率


# 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00"  106.50  1440 1528 1672 1904  900 903 909 934 -hsync +vsync


## 查看系统当前的屏幕输出端口

xrandr


HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080      60.0*+
1680x1050      60.0
1600x900       60.0
1280x1024      75.0     60.0
1280x800       59.8
1280x720       60.0
1024x768       75.0     60.0
800x600        75.0     60.3
640x480        75.0     59.9


## 添加新的Modeline

sudo xrandr --newmode "1440x900_60.00"  106.50  1440 1528 1672 1904  900 903 909 934 -hsync +vsync #这里的参数是我们第一步中得到的



xrandr


HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080      60.0*+
1680x1050      60.0
1600x900       60.0
1280x1024      75.0     60.0
1280x800       59.8
1280x720       60.0
1024x768       75.0     60.0
800x600        75.0     60.3
640x480        75.0     59.9
1440x900_60.00 (0x298)  106.5MHz
h: width  1440 start 1528 end 1672 total 1904 skew    0 clock   55.9KHz
v: height  900 start  903 end  909 total  934           clock   59.9Hz


## 设置分辨率

sudo xrandr --addmode HDMI-1 1440x900_60.00
sudo xrandr --output HDMI-1 --mode 1440x900_60.00


## 查看是否设置成功

sudo xrandr


HDMI-1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080      60.0*+
1680x1050      60.0
1600x900       60.0
1280x1024      75.0     60.0
1280x800       59.8
1280x720       60.0
1024x768       75.0     60.0
800x600        75.0     60.3
640x480        75.0     59.9
1440x900_60.00 (0x298)  106.5MHz
h: width  1440 start 1528 end 1672 total 1904 skew    0 clock   55.9KHz
v: height  900 start  903 end  909 total  934           clock   59.9Hz


## 其它尝试

Section "Device"
Option         "UseEDID" "False"
Option         "UseEDIDFreqs" "False"
Option         "ExactModeTimingsDVI" "True"
Option         "ModeValidation"  "NoTotalSizeCheck, NoDFPNativeResolutionCheck, NoEdidModes, NoMaxPClkCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoEdidMaxPClkCheck"

EndSection


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