modesetting: Document Option "DoubleShadow" in the man page
Signed-off-by: Adam Jackson <ajax@redhat.com>
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@ -54,6 +54,16 @@ The framebuffer device to use. Default: /dev/dri/card0.
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.BI "Option \*qShadowFB\*q \*q" boolean \*q
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Enable or disable use of the shadow framebuffer layer. Default: on.
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.TP
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.BI "Option \*qDoubleShadow\*q \*q" boolean \*q
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Double-buffer shadow updates. When enabled, the driver will keep two copies of
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the shadow framebuffer. When the shadow framebuffer is flushed, the old and new
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versions of the shadow are compared, and only tiles that have actually changed
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are uploaded to the device. This is an optimization for server-class GPUs with
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a remote display function (typically VNC), where remote updates are triggered
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by any framebuffer write, so minimizing the amount of data uploaded is crucial.
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This defaults to enabled for ASPEED and Matrox G200 devices, and disabled
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otherwise.
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.TP
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.BI "Option \*qAccelMethod\*q \*q" string \*q
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One of \*qglamor\*q or \*qnone\*q. Default: glamor.
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.TP
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