lxfb: disable suspend VT switch by default

By default disable VT switch, but allow it to be overridden via the
'vt_switch' module arg.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/fb/lxfb.txt b/Documentation/fb/lxfb.txt
index 8065607..38b3ca6 100644
--- a/Documentation/fb/lxfb.txt
+++ b/Documentation/fb/lxfb.txt
@@ -45,6 +45,8 @@
 mode_option	- specify the video mode.  Of the form
 		  <x>x<y>[-<bpp>][@<refresh>]
 vram		- size of video ram (normally auto-detected)
+vt_switch	- enable vt switching during suspend/resume.  The vt
+		  switch is slow, but harmless.
 
 --
 Andres Salomon <dilinger@debian.org>