树莓派3-配置-设置分辨率
树莓派3-配置-设置分辨率为何设置分辨率
树莓派的debian系统中是自动扫描显示器的，很多都不会满屏显示，这样的话就需要手动设置了，但是在进入系统后是没法设置的
实现方式
需要通过配置文件（config.txt）实现。
Noobs安装的系统在/boot/config.txt,非Noobs的系统在跟目录下config.txt
实现步骤
了解显示器支持的分辨率，比如显示器是7寸HDMI显示器，分辨率是800*600
在装了系统的SD卡上根目录找到“config.txt”，搜索hdmi mode, 修改和添加如下项目
hdmi_group=****
hdmi_mode=****
hdmi_group和hdmi_mode的值对应想要调整的分辨率。文后提供CEA分辨率和DMT分辨率对照表
CEA为电视规格分辨率,DMT为计算机计算机显示器使用的分辨率
针对自身的情况，选择DMT分辨率，其中8是最接近合适的参数，更改“config.txt”为，保存退出SD卡
hdmi_group=2
hdmi_mode=8
将SD插入树莓派，正常启动！
通过程序来判断合适的分辨率
CEA supported modes:
/opt/vc/bin/tvservice -m CEA
DMT supported modes:
/opt/vc/bin/tvservice -m DMT
比如运行
pi@raspberrypi:~ $ /opt/vc/bin/tvservice -m DMT
Group DMT has 2 modes:
mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
(prefer) mode 8: 800x600 @ 56Hz 4:3, clock:36MHz progressive
如果没有合适的分辨率, 可以设置一个，比如设置一个800*480的分辨率
hdmi_cvt=800 480 56 1
hdmi_group=2
hdmi_mode=87
hdmi_drive=2
注意事项
针对非Noobs安装的系统，根目录config.txt文件的
对于Noobs安装的系统，根目录没有config.txt文件的，进入系统的/boot/config.txt下进行修改重启
CEA分辨率
以下是CEA规定的电视规格分辨率。这些分辨率的hdmi_group=1
hdmi_mode=1 VGA
hdmi_mode=2 480p60Hz
hdmi_mode=3 480p60HzH
hdmi_mode=4 720p60Hz
hdmi_mode=5 1080i 60Hz
hdmi_mode=6 480i60Hz
hdmi_mode=7 480i60HzH
hdmi_mode=8 240p60Hz
hdmi_mode=9 240p60HzH
hdmi_mode=10 480i60Hz4x
hdmi_mode=11 480i60Hz4x H
hdmi_mode=12 240p60Hz4x
hdmi_mode=13 240p60Hz4x H
hdmi_mode=14 480p60Hz2x
hdmi_mode=15 480p60Hz2x H
hdmi_mode=16 1080p 60Hz
hdmi_mode=17 576p50Hz
hdmi_mode=18 576p50HzH
hdmi_mode=19 720p50Hz
hdmi_mode=20 1080i 50Hz
hdmi_mode=21 576i50Hz
hdmi_mode=22 576i50HzH
hdmi_mode=23 288p50Hz
hdmi_mode=24 288p50HzH
hdmi_mode=25 576i50Hz4x
hdmi_mode=26 576i50Hz4x H
hdmi_mode=27 288p50Hz4x
hdmi_mode=28 288p50Hz4x H
hdmi_mode=29 576p50Hz2x
hdmi_mode=30 576p50Hz2x H
hdmi_mode=31 1080p 50Hz
hdmi_mode=32 1080p 24Hz
hdmi_mode=33 1080p 25Hz
hdmi_mode=34 1080p 30Hz
hdmi_mode=35 480p60Hz4x
hdmi_mode=36 480p60Hz4xH
hdmi_mode=37 576p50Hz4x
hdmi_mode=38 576p50Hz4x H
hdmi_mode=39 1080i 50Hzreduced blanking
hdmi_mode=40 1080i 100Hz
hdmi_mode=41 720p100Hz
hdmi_mode=42 576p100Hz
hdmi_mode=43 576p100Hz H
hdmi_mode=44 576i100Hz
hdmi_mode=45 576i100Hz H
hdmi_mode=46 1080i 120Hz
hdmi_mode=47 720p120Hz
hdmi_mode=48 480p120Hz
hdmi_mode=49 480p120Hz H
hdmi_mode=50 480i120Hz
hdmi_mode=51 480i120Hz H
hdmi_mode=52 576p200Hz
hdmi_mode=53 576p200Hz H
hdmi_mode=54 576i200Hz
hdmi_mode=55 576i200Hz H
hdmi_mode=56 480p240Hz
hdmi_mode=57 480p240Hz H
hdmi_mode=58 480i240Hz
hdmi_mode=59 480i240Hz H
H means 16:9 variant (of a normally 4:3 mode).
2x means pixel doubled (i.e. higher clock rate, with each pixel repeated twice)
4x means pixel quadrupled (i.e. higher clock rate, with each pixel repeated four times)
DMT分辨率
以下是计算机显示器使用的分辨率。这些分辨率的hdmi_group=2
hdmi_mode=1 640x350 85Hz
hdmi_mode=2 640x400 85Hz
hdmi_mode=3 720x400 85Hz
hdmi_mode=4 640x480 60Hz
hdmi_mode=5 640x480 72Hz
hdmi_mode=6 640x480 75Hz
hdmi_mode=7 640x480 85Hz
hdmi_mode=8 800x600 56Hz
hdmi_mode=9 800x600 60Hz
hdmi_mode=10 800x600 72Hz
hdmi_mode=11 800x600 75Hz
hdmi_mode=12 800x600 85Hz
hdmi_mode=13 800x600 120Hz
hdmi_mode=14 848x480 60Hz
hdmi_mode=15 1024x76843HzDO NOT USE
hdmi_mode=16 1024x76860Hz
hdmi_mode=17 1024x76870Hz
hdmi_mode=18 1024x76875Hz
hdmi_mode=19 1024x76885Hz
hdmi_mode=20 1024x768120Hz
hdmi_mode=21 1152x86475Hz
hdmi_mode=22 1280x768 reduced blanking
hdmi_mode=23 1280x76860Hz
hdmi_mode=24 1280x76875Hz
hdmi_mode=25 1280x76885Hz
hdmi_mode=26 1280x768120Hz reduced blanking
hdmi_mode=27 1280x800 reduced blanking
hdmi_mode=28 1280x80060Hz
hdmi_mode=29 1280x80075Hz
hdmi_mode=30 1280x80085Hz
hdmi_mode=31 1280x800120Hz reduced blanking
hdmi_mode=32 1280x96060Hz
hdmi_mode=33 1280x96085Hz
hdmi_mode=34 1280x960120Hz reduced blanking
hdmi_mode=35 1280x1024 60Hz
hdmi_mode=36 1280x1024 75Hz
hdmi_mode=37 1280x1024 85Hz
hdmi_mode=38 1280x1024 120Hz reduced blanking
hdmi_mode=39 1360x76860Hz
hdmi_mode=40 1360x768120Hz reduced blanking
hdmi_mode=41 1400x1050 reduced blanking
hdmi_mode=42 1400x1050 60Hz
hdmi_mode=43 1400x1050 75Hz
hdmi_mode=44 1400x1050 85Hz
hdmi_mode=45 1400x1050 120Hz reduced blanking
hdmi_mode=46 1440x900 reduced blanking
hdmi_mode=47 1440x90060Hz
hdmi_mode=48 1440x90075Hz
hdmi_mode=49 1440x90085Hz
hdmi_mode=50 1440x900120Hz reduced blanking
hdmi_mode=51 1600x1200 60Hz
hdmi_mode=52 1600x1200 65Hz
hdmi_mode=53 1600x1200 70Hz
hdmi_mode=54 1600x1200 75Hz
hdmi_mode=55 1600x1200 85Hz
hdmi_mode=56 1600x1200 120Hz reduced blanking
hdmi_mode=57 1680x1050 reduced blanking
hdmi_mode=58 1680x1050 60Hz
hdmi_mode=59 1680x1050 75Hz
hdmi_mode=60 1680x1050 85Hz
hdmi_mode=61 1680x1050 120Hz reduced blanking
hdmi_mode=62 1792x1344 60Hz
hdmi_mode=63 1792x1344 75Hz
hdmi_mode=64 1792x1344 120Hz reduced blanking
hdmi_mode=65 1856x1392 60Hz
hdmi_mode=66 1856x1392 75Hz
hdmi_mode=67 1856x1392 120Hz reduced blanking
hdmi_mode=68 1920x1200 reduced blanking
hdmi_mode=69 1920x1200 60Hz
hdmi_mode=70 1920x1200 75Hz
hdmi_mode=71 1920x1200 85Hz
hdmi_mode=72 1920x1200 120Hz reduced blanking
hdmi_mode=73 1920x1440 60Hz
hdmi_mode=74 1920x1440 75Hz
hdmi_mode=75 1920x1440 120Hz reduced blanking
hdmi_mode=76 2560x1600 reduced blanking
hdmi_mode=77 2560x1600 60Hz
hdmi_mode=78 2560x1600 75Hz
hdmi_mode=79 2560x1600 85Hz
hdmi_mode=80 2560x1600 120Hz reduced blanking
hdmi_mode=81 1366x76860Hz
hdmi_mode=82 1080p 60Hz
hdmi_mode=83 1600x900 reduced blanking
hdmi_mode=84 2048x1152 reduced blanking
hdmi_mode=85 720p 60Hz
hdmi_mode=86 1366x768 reduced blanking
转自：创客智造
挺好的，之前用个微雪的屏就无法正常显示，需要修改参数
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