org video card drivers are designed to work with a particular video
chipset, but different video cards may use a chipset in different ways. For example, a
chipset might support a TV-out connection, but a low-end video card based on that
chipset may not have TV-out circuitry on the card. Likewise, the amount of video
memory and the speed of the DACs may vary considerably.
In most cases, these card-to-card differences can be automatically detected, but most
of the video drivers provide configuration options so that their operation can be optimized
and so that features can be turned off if a card compatibility issue arises.
A manpage is provided listing the options supported by each video driver, but an easier
way to find out what options are supported by a specific driver is to run X -
configure and then examine the Device section of the generated file. The options
available for the selected driver will be listed, or commented-out. For example, these
entries are automatically added to the xorg.conf file when the ati driver is selected:
### Available Driver options are:-
### Values:
: integer, : float, : "True"/"False",
### : "String", : " Hz/kHz/MHz"
### [arg]: arg optional
#Option "accel" # []
#Option "crt_display" # []
#Option "composite_sync" # []
#Option "hw_cursor" # []
#Option "linear" # []
#Option "mmio_cache" # []
#Option "panel_display" # []
#Option "probe_clocks" # []
#Option "reference_clock" #
#Option "shadow_fb" # []
#Option "sw_cursor" # []
The options marked [] accept an optional boolean value: "true", "1", "on",
"yes", or no value to turn the option on; "false", "0", "off", or "no" to turn the
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