xdpyinfo

root@venus:~# xdpyinfo
name of display:    :0
version number:    11.0
vendor string:    Oracle Corporation, based on X.Org Foundation sources
vendor release number:    11905000
X.Org version: 1.19.5
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, MSBFirst, 32
image byte order:    MSBFirst
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:  PointerRoot
number of extensions:    29
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DPMS
    DRI2
    GLX
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    Present
    RANDR
    RECORD
    RENDER
    SECURITY
    SGI-GLX
    SHAPE
    SYNC
    SolarisIA
    X-Resource
    XC-MISC
    XFIXES
    XFree86-DGA
    XFree86-VidModeExtension
    XINERAMA
    XInputExtension
    XKEYBOARD
    XTEST
    XVideo
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    1280x1024 pixels (339x271 millimeters)
  resolution:    96x96 dots per inch
  depths (7):    32, 1, 4, 8, 15, 16, 24
  root window id:    0x16e
  depth of root window:    32 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x20
  default number of colormap cells:    2048
  preallocated pixels:    black 4278190080, white 4294967295
  options:    backing-store WHEN MAPPED, save-unders NO
  largest cursor:    1280x1024
  current input event mask:    0x6a0003
    KeyPressMask             KeyReleaseMask           StructureNotifyMask
    SubstructureNotifyMask   FocusChangeMask          PropertyChangeMask
  number of visuals:    1
  default visual id:  0x21
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    32 planes
    available colormap entries:    2048 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits