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authorAndres Salomon <dilinger@queued.net>2008-04-28 13:15:03 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 19:58:36 +0400
commitb6f448e99ce7955b9707ed36a46cab2c6ddf7ddc (patch)
tree74ae26692c1fd713a0178faca99dea6761d442e8 /Documentation/fb
parent46fb6f110dfc3fc99f44cf701f66ea3e790b6a81 (diff)
downloadlinux-b6f448e99ce7955b9707ed36a46cab2c6ddf7ddc.tar.xz
PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch
Prior to suspend, we allocate and switch to a new VT; after suspend, we switch back to the original VT. This can be slow, and is completely unnecessary if the framebuffer we're using can restore video properly. This adds a hook that allows drivers to select whether or not to do this vt switch, and changes the gxfb driver to call this hook. It also adds a module param to gxfb to allow controlling of the vt switch (defaulting to no switch). (Note: I'm not convinced that console_sem is the best way to protect this, but we should probably have some form of locking..) [akpm@linux-foundation.org: build fix] Signed-off-by: Andres Salomon <dilinger@debian.org> Cc: Jordan Crouse <jordan.crouse@amd.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/fb')
-rw-r--r--Documentation/fb/gxfb.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/fb/gxfb.txt b/Documentation/fb/gxfb.txt
index b56096142017..2f640903bbb2 100644
--- a/Documentation/fb/gxfb.txt
+++ b/Documentation/fb/gxfb.txt
@@ -45,7 +45,8 @@ Accepted options:
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>