1. xdpyinfo 获取显示器的分辨率

$ xdpyinfo | grep -B2 resolution
root@linaro-alip:~# xdpyinfo |grep -B2 resolution
screen #0:
  dimensions:    2560x800 pixels (677x211 millimeters)
  resolution:    96x96 dots per inch

2. xdpyinfo 设置 DPI

xrandr --dpi 144

3. xdpyinfo 帮助信息

usage:  xdpyinfo [options]
-display displayname	server to query
-version		print program version and exit
-queryExtensions	print info returned by XQueryExtension
-ext all		print detailed info for all supported extensions
-ext extension-name	print detailed info for extension-name if one of:
     MIT-SHM XKEYBOARD Multi-Buffering SHAPE SYNC XFree86-DGA
     XFree86-VidModeExtension XTEST DOUBLE-BUFFER RECORD XInputExtension
     RENDER Composite XINERAMA

4. xdpyinfo 打印 当前设备信息

root@linaro-alip:~# xdpyinfo
name of display:    :0
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    12004000
X.Org version: 1.20.4
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    7
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 4, bits_per_pixel 8, scanline_pad 32
    depth 8, bits_per_pixel 8, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
    depth 24, bits_per_pixel 32, scanline_pad 32
    depth 32, bits_per_pixel 32, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x1c00014, revert to Parent
number of extensions:    28
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DPMS
    DRI2
    DRI3
    GLX
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    Present
    RANDR
    RECORD
    RENDER
    SECURITY
    SHAPE
    SYNC
    X-Resource
    XC-MISC
    XFIXES
    XFree86-DGA
    XFree86-VidModeExtension
    XINERAMA
    XInputExtension
    XKEYBOARD
    XTEST
    XVideo
default screen number:    0
number of screens:    1