Xdpyinfo is a utility for displaying information about an X server. It is used to examine the capabilities of a server, the predefined values for various parameters used in communicating between clients and the server, and the different types of screens and visuals that are available.
The following shows a sample produced by xdpyinfo when connected to display that supports an 8 plane screen and a 1 plane screen.
name of display: :0.0
version number: 11.0
vendor string: MIT X Consortium
vendor release number: 4
maximum request size: 16384 longwords (65536 bytes)
motion buffer size: 0
bitmap unit, bit order, padding: 32, MSBFirst, 32
image byte order: MSBFirst
number of supported pixmap formats: 2
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
keycode range: minimum 8, maximum 129
focus: PointerRoot
number of extensions: 4
SHAPE
MIT-SHM
Multi-Buffering
MIT-SUNDRY-NONSTANDARD
default screen number: 0
number of screens: 2
screen #0:
dimensions: 1152x900 pixels (325x254 millimeters)
resolution: 90x90 dots per inch
depths (2): 1, 8
root window id: 0x8006e
depth of root window: 8 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x8006b
default number of colormap cells: 256
preallocated pixels: black 1, white 0
options: backing-store YES, save-unders YES
current input event mask: 0xd0801d
KeyPressMask ButtonPressMask ButtonReleaseMask
EnterWindowMask ExposureMask SubstructureRedirectMask
PropertyChangeMask ColormapChangeMask
number of visuals: 6
default visual id: 0x80065
visual:
visual id: 0x80065
class: PseudoColor
depth: 8 planes
size of colormap: 256 entries
red, green, blue masks: 0x0, 0x0, 0x0
significant bits in color specification: 8 bits
visual:
visual id: 0x80066
class: DirectColor
depth: 8 planes
size of colormap: 8 entries
red, green, blue masks: 0x7, 0x38, 0xc0
significant bits in color specification: 8 bits
visual:
visual id: 0x80067
class: GrayScale
depth: 8 planes
size of colormap: 256 entries
red, green, blue masks: 0x0, 0x0, 0x0
significant bits in color specification: 8 bits
visual:
visual id: 0x80068
class: StaticGray
depth: 8 planes
size of colormap: 256 entries
red, green, blue masks: 0x0, 0x0, 0x0
significant bits in color specification: 8 bits
visual:
visual id: 0x80069
class: StaticColor
depth: 8 planes
size of colormap: 256 entries
red, green, blue masks: 0x7, 0x38, 0xc0
significant bits in color specification: 8 bits
visual:
visual id: 0x8006a
class: TrueColor
depth: 8 planes
size of colormap: 8 entries
red, green, blue masks: 0x7, 0x38, 0xc0
significant bits in color specification: 8 bits
number of mono multibuffer types: 6
visual id, max buffers, depth: 0x80065, 0, 8
visual id, max buffers, depth: 0x80066, 0, 8
visual id, max buffers, depth: 0x80067, 0, 8
visual id, max buffers, depth: 0x80068, 0, 8
visual id, max buffers, depth: 0x80069, 0, 8
visual id, max buffers, depth: 0x8006a, 0, 8
number of stereo multibuffer types: 0
screen #1:
dimensions: 1152x900 pixels (325x254 millimeters)
resolution: 90x90 dots per inch
depths (1): 1
root window id: 0x80070
depth of root window: 1 plane
number of colormaps: minimum 1, maximum 1
default colormap: 0x8006c
default number of colormap cells: 2
preallocated pixels: black 1, white 0
options: backing-store YES, save-unders YES
current input event mask: 0xd0801d
KeyPressMask ButtonPressMask ButtonReleaseMask
EnterWindowMask ExposureMask SubstructureRedirectMask
PropertyChangeMask ColormapChangeMask
number of visuals: 1
default visual id: 0x80064
visual:
visual id: 0x80064
class: StaticGray
depth: 1 plane
size of colormap: 2 entries
red, green, blue masks: 0x0, 0x0, 0x0
significant bits in color specification: 1 bits
number of mono multibuffer types: 1
visual id, max buffers, depth: 0x80064, 0, 1
number of stereo multibuffer types: 0