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modesetting: Document Option "DoubleShadow" in the man page 

Signed-off-by: Adam Jackson <ajax@redhat.com>
(cherry picked from commit c4f3e42fe3)
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Adam Jackson 2018-08-29 16:07:59 -04:00 committed by Olivier Fourdan
parent fdb80a327c
commit 8e646ca985
1 changed files with 10 additions and 0 deletions
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hw/xfree86/drivers/modesetting/modesetting.man
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@ -54,6 +54,16 @@ The framebuffer device to use. Default: /dev/dri/card0.
.BI "Option \*qShadowFB\*q \*q" boolean \*q
Enable or disable use of the shadow framebuffer layer. Default: on.
.TP
.BI "Option \*qDoubleShadow\*q \*q" boolean \*q
Double-buffer shadow updates. When enabled, the driver will keep two copies of
the shadow framebuffer. When the shadow framebuffer is flushed, the old and new
versions of the shadow are compared, and only tiles that have actually changed
are uploaded to the device. This is an optimization for server-class GPUs with
a remote display function (typically VNC), where remote updates are triggered
by any framebuffer write, so minimizing the amount of data uploaded is crucial.
This defaults to enabled for ASPEED and Matrox G200 devices, and disabled
otherwise.
.TP
.BI "Option \*qAccelMethod\*q \*q" string \*q
One of \*qglamor\*q or \*qnone\*q. Default: glamor.
.TP