tree a4dfb7b415cc9591f3450ee2220b520af9517c38
parent dc1c43e972c95b82416cc87258dbc037d6de5923
author Christian Trefzer <ctrefzer@gmx.de> 1151306815 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151341111 -0700

[PATCH] neofb: fix unblank logic interfering with lid toggled backlight

This is a fix for the most annoying problem that remained with neofb:

After "setterm -powersave powerdown" the console blanker will disable the
backlight after the given timeout expires.  If this happens after the lid
has been shut, we read "LCD off" from the register and store that in the
driver.  Once the lid is opened, the backlight turns on, but any key press
that would awaken the blanked console will switch the backlight off again.

The workaround so far was to use the "display config toggle" Fn key combo -
once if no external display is attached, otherwise as often as required to
restore the desired display setup.

The following patch fixes the issue at least for the LCD-only case, with no
external monitor attached.  Other display setup permutations are pending
further testing, but so far I can guarantee at least no negative change in
behaviour, if any at all.

Signed-off-by: Christian Trefzer <ctrefzer@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>