附件下载：config.txt点我下载。请右键另存为。
旋转屏幕指令如下：注意，参考角度为显示屏逆时针旋转角度。即显示屏逆时针旋转90度即为90度。若显示屏顺时针旋转90度即为270度。
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1 2 3 4 |
display_rotate=0 Normal display_rotate=1 90 degrees display_rotate=2 180 degrees display_rotate=3 270 degrees |
树梅派中可直接设置：其目录在/boot目录下。
将其中的hdmi_group和hdmi_mode修改为2和35。并且将前面的＃号删除，如下所示。
hdmi_group=2
hdmi_mode=35
主要原因是因为我们课程中用的显示器的分辨率是1280*1024。其他分辨率可参考下面的表格。
发现一个问题，那就是config.txt的权限要求较高，不能用自带的edit编辑器进行编辑，会报权限不够的错误。
所以只能在命令行下，用nano编辑器进行修改：如下图所示：需要注意的是，需要用管理员权限。
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sudo nano /boot/config.txt
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然后通过^x离开并保存文件。
这样才算大功告成。
前言
config.txt中默认设置在大部分的硬件系统下都能很好地工作，但是视频输出常常出现问题。这个问题产生的主要原因是过扫描（overscan）和欠扫描，尤其是在使用复合视频输出的时候。
用户可以通过设置/boot/config.txt来解决这个问题。
打开config.txt
sudo nano /boot/config.txt |
步骤
1.修改overscan选项
#去掉下面的注释符来调整overscan（过扫描）。#如果控制台跑出屏幕，请使用正数。#如果镶边太大，请使用负数。overscan_left=10overscan_right=10overscan_top=0overscan_bottom=0 |
2.设置分辨率
#uncomment to force a specific HDMI mode (here we are forcing 1366*768(DMT) for 康佳led32IS97N!)#hdmi_group有两个模式：CEA（电视规格分辨率）、DMT（计算机显示器分辨率）#hdmi_mode对应的是具体想要调整的分辨率（具体见附录）#hdmi_ignore_edid是命令树莓派不检测HDMI设备的任何信息，只按照我们指定的分辨率输出。#如果不加，树莓派可能仍会“自作聪明”的检测HDMI设备的分辨率，结果造成我们设置的分辨率无效。hdmi_group=2hdmi_mode=86hdmi_ignore_edid=0xa5000080 |
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 VGAhdmi_mode=2 480p 60Hzhdmi_mode=3 480p 60Hz Hhdmi_mode=4 720p 60Hzhdmi_mode=5 1080i 60Hzhdmi_mode=6 480i 60Hzhdmi_mode=7 480i 60Hz Hhdmi_mode=8 240p 60Hzhdmi_mode=9 240p 60Hz Hhdmi_mode=10 480i 60Hz 4xhdmi_mode=11 480i 60Hz 4x Hhdmi_mode=12 240p 60Hz 4xhdmi_mode=13 240p 60Hz 4x Hhdmi_mode=14 480p 60Hz 2xhdmi_mode=15 480p 60Hz 2x Hhdmi_mode=16 1080p 60Hzhdmi_mode=17 576p 50Hzhdmi_mode=18 576p 50Hz Hhdmi_mode=19 720p 50Hzhdmi_mode=20 1080i 50Hzhdmi_mode=21 576i 50Hzhdmi_mode=22 576i 50Hz Hhdmi_mode=23 288p 50Hzhdmi_mode=24 288p 50Hz Hhdmi_mode=25 576i 50Hz 4xhdmi_mode=26 576i 50Hz 4x Hhdmi_mode=27 288p 50Hz 4xhdmi_mode=28 288p 50Hz 4x Hhdmi_mode=29 576p 50Hz 2xhdmi_mode=30 576p 50Hz 2x Hhdmi_mode=31 1080p 50Hzhdmi_mode=32 1080p 24Hzhdmi_mode=33 1080p 25Hzhdmi_mode=34 1080p 30Hzhdmi_mode=35 480p 60Hz 4xhdmi_mode=36 480p 60Hz 4xHhdmi_mode=37 576p 50Hz 4xhdmi_mode=38 576p 50Hz 4x Hhdmi_mode=39 1080i 50Hz reduced blankinghdmi_mode=40 1080i 100Hzhdmi_mode=41 720p 100Hzhdmi_mode=42 576p 100Hzhdmi_mode=43 576p 100Hz Hhdmi_mode=44 576i 100Hzhdmi_mode=45 576i 100Hz Hhdmi_mode=46 1080i 120Hzhdmi_mode=47 720p 120Hzhdmi_mode=48 480p 120Hzhdmi_mode=49 480p 120Hz Hhdmi_mode=50 480i 120Hzhdmi_mode=51 480i 120Hz Hhdmi_mode=52 576p 200Hzhdmi_mode=53 576p 200Hz Hhdmi_mode=54 576i 200Hzhdmi_mode=55 576i 200Hz Hhdmi_mode=56 480p 240Hzhdmi_mode=57 480p 240Hz Hhdmi_mode=58 480i 240Hzhdmi_mode=59 480i 240Hz HH 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 85Hzhdmi_mode=2 640x400 85Hzhdmi_mode=3 720x400 85Hzhdmi_mode=4 640x480 60Hzhdmi_mode=5 640x480 72Hzhdmi_mode=6 640x480 75Hzhdmi_mode=7 640x480 85Hzhdmi_mode=8 800x600 56Hzhdmi_mode=9 800x600 60Hzhdmi_mode=10 800x600 72Hzhdmi_mode=11 800x600 75Hzhdmi_mode=12 800x600 85Hzhdmi_mode=13 800x600 120Hzhdmi_mode=14 848x480 60Hzhdmi_mode=15 1024x768 43Hz DO NOT USEhdmi_mode=16 1024x768 60Hzhdmi_mode=17 1024x768 70Hzhdmi_mode=18 1024x768 75Hzhdmi_mode=19 1024x768 85Hzhdmi_mode=20 1024x768 120Hzhdmi_mode=21 1152x864 75Hzhdmi_mode=22 1280x768 reduced blankinghdmi_mode=23 1280x768 60Hzhdmi_mode=24 1280x768 75Hzhdmi_mode=25 1280x768 85Hzhdmi_mode=26 1280x768 120Hz reduced blankinghdmi_mode=27 1280x800 reduced blankinghdmi_mode=28 1280x800 60Hzhdmi_mode=29 1280x800 75Hzhdmi_mode=30 1280x800 85Hzhdmi_mode=31 1280x800 120Hz reduced blankinghdmi_mode=32 1280x960 60Hzhdmi_mode=33 1280x960 85Hzhdmi_mode=34 1280x960 120Hz reduced blankinghdmi_mode=35 1280x1024 60Hzhdmi_mode=36 1280x1024 75Hzhdmi_mode=37 1280x1024 85Hzhdmi_mode=38 1280x1024 120Hz reduced blankinghdmi_mode=39 1360x768 60Hzhdmi_mode=40 1360x768 120Hz reduced blankinghdmi_mode=41 1400x1050 reduced blankinghdmi_mode=42 1400x1050 60Hzhdmi_mode=43 1400x1050 75Hzhdmi_mode=44 1400x1050 85Hzhdmi_mode=45 1400x1050 120Hz reduced blankinghdmi_mode=46 1440x900 reduced blankinghdmi_mode=47 1440x900 60Hzhdmi_mode=48 1440x900 75Hzhdmi_mode=49 1440x900 85Hzhdmi_mode=50 1440x900 120Hz reduced blankinghdmi_mode=51 1600x1200 60Hzhdmi_mode=52 1600x1200 65Hzhdmi_mode=53 1600x1200 70Hzhdmi_mode=54 1600x1200 75Hzhdmi_mode=55 1600x1200 85Hzhdmi_mode=56 1600x1200 120Hz reduced blankinghdmi_mode=57 1680x1050 reduced blankinghdmi_mode=58 1680x1050 60Hzhdmi_mode=59 1680x1050 75Hzhdmi_mode=60 1680x1050 85Hzhdmi_mode=61 1680x1050 120Hz reduced blankinghdmi_mode=62 1792x1344 60Hzhdmi_mode=63 1792x1344 75Hzhdmi_mode=64 1792x1344 120Hz reduced blankinghdmi_mode=65 1856x1392 60Hzhdmi_mode=66 1856x1392 75Hzhdmi_mode=67 1856x1392 120Hz reduced blankinghdmi_mode=68 1920x1200 reduced blankinghdmi_mode=69 1920x1200 60Hzhdmi_mode=70 1920x1200 75Hzhdmi_mode=71 1920x1200 85Hzhdmi_mode=72 1920x1200 120Hz reduced blankinghdmi_mode=73 1920x1440 60Hzhdmi_mode=74 1920x1440 75Hzhdmi_mode=75 1920x1440 120Hz reduced blankinghdmi_mode=76 2560x1600 reduced blankinghdmi_mode=77 2560x1600 60Hzhdmi_mode=78 2560x1600 75Hzhdmi_mode=79 2560x1600 85Hzhdmi_mode=80 2560x1600 120Hz reduced blankinghdmi_mode=81 1366x768 60Hzhdmi_mode=82 1080p 60Hzhdmi_mode=83 1600x900 reduced blankinghdmi_mode=84 2048x1152 reduced blankinghdmi_mode=85 720p 60Hzhdmi_mode=86 1366x768 reduced blanking |
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