只要按照下面方法修改注册表，微软自带的驱动就可以全屏不留黑边。
驱动程序提供商： Advanced Micro Devices，Incl.
驱动程序日期： 2015/1/13
驱动程序版本： 8.970.100.9001
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黑边即显示系统桌面区域和物理屏幕边缘之间的区域。
桌面不能撑满屏幕。
hd4200 for windows7 64位驱动 （windows10可用）
https://support.amd.com/zh-cn/download/desktop/legacy?product=legacy2&os=Windows%207%20-%2064
具体就是把注册表某一项的值改为0，对于我的屏幕分辨率是1920x1080 ,对应60HZ刷新率：
DALR6 DFPI 21920x1080x0x60
修改全部为0 就好了。
或者是下面也行：
"DALR6 DFPI 21920x1080x0x60"=hex:00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,01,00,00,00
"DALR6 CRT1920x1080x0x60"=hex:00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00
有些59HZ的也可以如法炮制：
DALR6 DFPI 21920x1080x0x59
因为明明60HZ的显示器，系统认为是59HZ；我猜测是精度的原因，又增加了59HZ的选项，这恐怕是三流产品的原因？？？
步骤：
- In windows 10 click Cortana, search for "regedit", and run it.
- Click File, Export and save as "backup" to wherever you want, just in case something goes wrong you can revert it back.
- On the left navigate to the path HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\
- In this folder there will be multiple folders with long names, look forthe one with a folder inside named "0000", there will be a ton of othersettings, on the right, once you find the right one.
As an example the folder name my "0000" was located in is "{55038BE3-BCB9-4757-9ACF-05AC30F7CBF9}"
- Next right click the "0000" folder and click "Find", search for the resolution you are using, in my case it was 1920x1080.
- It will highlight it on the right, for me it was "DALR6 DFPI21920x1080x0x59", the last number is the refresh rate for the screen,look for the refresh rate you use if the first one it highlights is notthe one.
- Right click the highlighted name and click Modify
- Here we want to change all the numbers on the right to 00's, put your cursor before the number you want to change, press the "Del" key, then press"0".
- Click OK, minimize the registry and right click the desktop, Display Settings, Advanced Display Settings, and change the resolution to anything else, then back to the resolution you edited in regedit. Your underscan should be gone! (Edit: If changingresolution doesn't work, try rebooting.)