linux-kernel - Re: regression since 2.6.36: backlight in sony-laptop not working

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Message-ID: <20101112042243.GE2852@kamineko.org>
Date:	Fri, 12 Nov 2010 13:22:43 +0900
From:	Mattia Dongili <malattia@...ux.it>
To:	Norbert Preining <preining@...ic.at>
Cc:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>
Subject: Re: regression since 2.6.36: backlight in sony-laptop not working

On Fri, Nov 12, 2010 at 03:57:32AM +0000, Matthew Garrett wrote:
> On Fri, Nov 12, 2010 at 12:50:27PM +0900, Norbert Preining wrote:
> > THen the problem is simply that the acpi events are not coming through
> > when pressing the respective keys.
> 
> Then yes, that's probably related to sony-laptop. If you run evtest 
> against the /dev/input/event device that corresponds to sony-laptop, 
> what events do you get when you hit the brightness keys?

backlight (actually Fn+F[56]) is one of those keys the needs remapping
these days, i.e. if xev doesn't get any event in X then you may need
something like:

$ diff -u <(sudo input-kbd 5) vaio-kbd
/dev/input/event5
   bustype : BUS_ISA
   vendor  : 0x104d
   product : 0x0
   version : 0
   name    : "Sony Vaio Keys"
   bits ev : EV_SYN EV_KEY EV_MSC

map: 44 keys, size: 59/64
--- /proc/self/fd/11    2010-11-12 13:10:39.811178332 +0900
+++ vaio-kbd    2010-10-31 19:24:49.000000000 +0900
@@ -4,8 +4,8 @@
 0x0006 = 467  # KEY_FN_F2
 0x0007 = 468  # KEY_FN_F3
 0x0008 = 469  # KEY_FN_F4
-0x0009 = 470  # KEY_FN_F5
-0x000a = 471  # KEY_FN_F6
+0x0009 = 224  # KEY_BRIGHTNESSDOWN
+0x000a = 225  # KEY_BRIGHTNESSUP
 0x000b = 472  # KEY_FN_F7
 0x000c = 473  # KEY_FN_F8
 0x000d = 474  # KEY_FN_F9

See the manpage for input-kbd and /usr/include/linux/input.h for valid
key values.
In short `input-kbd <devNo>` gives you the current map. Redirect the
output to a file, edit it to change the keys you need remapped and run
`input-kbd -f <file> <devNo>`.

For a reference look at this bug report:
http://bugs.freedesktop.org/show_bug.cgi?id=11227

If the above is not the case then there might be another problem in
sony-laptop as Matthew suggests.
-- 
mattia
:wq!
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