John Martin wrote:
What does "xdpyinfo -ext XINERAMA" report when you enable
the external monitor with xrandr?
Couple of differences I noticed on my system (Ultra 24, Quadro FX 370):
snv_110:
XINERAMA version 1.1 opcode: 153
snv_111:
XINERAMA version 1.1 opcode: 152
SGI-GLX extension added
% diff xdpyinfo110.txt xdpyinfo111.txt
19,20c19,20
< focus: window 0x4400022, revert to PointerRoot
< number of extensions: 33
---
> focus: window 0x3400022, revert to PointerRoot
> number of extensions: 34
35a36
> SGI-GLX
62c63
< root window id: 0x25b
---
> root window id: 0x27b
1674c1675
< XINERAMA version 1.1 opcode: 153
---
> XINERAMA version 1.1 opcode: 152
output on snv_111:
% cat xdpyinfo111.txt
name of display: :0.0
version number: 11.0
vendor string: Sun Microsystems, Inc.
vendor release number: 10503000
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 0x3400022, revert to PointerRoot
number of extensions: 34
BIG-REQUESTS
Composite
DAMAGE
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
GLX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
NV-CONTROL
NV-GLX
RANDR
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
SolarisIA
TOG-CUP
X-Resource
XC-APPGROUP
XC-MISC
XEVIE
XFIXES
XFree86-DGA
XFree86-Misc
XFree86-VidModeExtension
XINERAMA
XINERAMA
XInputExtension
XKEYBOARD
XTEST
XVideo
default screen number: 0
number of screens: 1
screen #0:
print screen: no
dimensions: 2560x1024 pixels (867x347 millimeters)
resolution: 75x75 dots per inch
depths (7): 24, 1, 4, 8, 15, 16, 32
root window id: 0x27b
depth of root window: 24 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 256
preallocated pixels: black 0, white 16777215
options: backing-store NO, save-unders NO
largest cursor: 64x64
current input event mask: 0xfa8033
KeyPressMask KeyReleaseMask EnterWindowMask
LeaveWindowMask ExposureMask
StructureNotifyMask
SubstructureNotifyMask SubstructureRedirectMask FocusChangeMask
PropertyChangeMask ColormapChangeMask
number of visuals: 228
default visual id: 0x21
visual:
visual id: 0x21
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 11 bits
visual:
visual id: 0x22
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 11 bits
[snip lots of visuals]
visual:
visual id: 0x104
class: TrueColor
depth: 32 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
XINERAMA version 1.1 opcode: 152
head #0: 1280x1024 @ 0,0
head #1: 1280x1024 @ 1280,0
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