7
4.7 Using Multiple Outputs from One Video Card 77
Device "Card1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 1280 1024 # Virtual size to scroll around
# Do not specify a viewport -- center around the cursor
Modes "640x480"
EndSubSection
EndSection
Section "Screen" # Full-screen display
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024"
EndSubSection
EndSection
4.7 Using Multiple Outputs from One Video Card
Many current video cards support multiple video outputs: dual VGA, DVI and VGA,
VGA and TV-out, and laptop panel and VGA are all common combinations. Some of
the X.org drivers support the simultaneous use of both outputs; this works by allocating
a large framebuffer and then positioning the rectangles that will be output to
each video connection within that framebuffer.
This sounds a lot like Xinerama, because it is! However, there are a few differences
between using multiple outputs on one card and using multiple video cards, as outlined
in Table 4-2.
This capability is available in a number of drivers: the NVIDIA closed-source driver
NVIDIA, the ATI open source driver radeon, and the ATI closed-source driver fglrx.
Pages:
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145