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-rw-r--r--Documentation/fb/udlfb.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/fb/udlfb.txt b/Documentation/fb/udlfb.txt
index 7fdde2a02a27..473ceed9e4eb 100644
--- a/Documentation/fb/udlfb.txt
+++ b/Documentation/fb/udlfb.txt
@@ -105,6 +105,11 @@ console Allow fbcon to attach to udlfb provided framebuffers. This
the first framebuffer it finds, which isn't usually what the
user wants in the case of USB displays.
+shadow Allocate a 2nd framebuffer to shadow what's currently across
+ the USB bus in device memory. If any pixels are unchanged,
+ do not transmit. Spends host memory to save USB transfers.
+ Enabled by default. Only disable on very low memory systems.
+
Sysfs Attributes
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