树莓派一般可以自动检测目标设备的分辨率。
但对于部分设备，尤其是HDMI-VGA转换器，分辨率可能会明显不对（过大或过小）。这时就需要给树莓派指定一个分辨率。更改树莓派前面那个FAT32分区里的config.txt，修改或加入以下项目：
hdmi_group=****hdmi_mode=****hdmi_ignore_edid=0xa5000080hdmi_group和hdmi_mode的值对应想要调整的分辨率。见文后。
另外一项“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。注意，如果您使用HDMI-VGA转换器出现以下故障：
分辨率不对 —— 请参考下文。黑屏 —— 请参考：HDMI-VGA转换器黑屏的排障方案。断续黑屏、系统不稳定 —— 可能是无源的转换器功耗过大，造成树莓派的电源故障。请使用有单独电源输入的HDMI-VGA转换器。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