linux-kernel - Re: backlight control broken on Sony VGN-P21Z with staging/gma500

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Date:	Fri, 15 Apr 2011 14:47:47 -0600
From:	"Joey Lee" <jlee@...ell.com>
To:	<kristoffer.ericson@...il.com>
Cc:	<jp@...ea.net>, <devel@...verdev.osuosl.org>,
	"Joey Lee" <JLee@...ell.com>, <linux-kernel@...r.kernel.org>
Subject: Re: backlight control broken on Sony VGN-P21Z with
 staging/gma500

Hi Kristoffer,

於 五，2011-04-15 於 17:30 +0200，Kristoffer Ericson 提到：
> On Wed, Apr 13, 2011 at 09:54:45PM +0200, Joost Pjotr Vermeer wrote:
> > Hi,
> > 
> > I tried the new gma500 driver from staging on my Sony VGN-P21Z. It
> > seems to work very nice.
> > 
> > But backlight control does not work. It has worked with a previous
> > version of the staging/gma500 driver. I can solve it by removing the
> > call to acpi_video_register() from psb_driver_load() in psb_drv.c.
> > 
> > Can I try anything to find a more specific cause for this?
> > 
> 
> Got same hardware, and the backlight isnt working properly yet. 
> As the driver is very new and alan is working away at bits and pieces I wouldnt expect to much yet.
> 
> Oh and I assume you already grabbed the psb-bl "error" at bootup:
> [    1.507066] fbcon: psbfb (fb0) is primary device
> [    1.982816] fb0: psbfb frame buffer device
> [    1.982871] psb-bl: invalid backlight type
> [    1.982951]  [<c131e603>] ? psb_backlight_init+0x32/0x185
> [    1.982960]  [<c1320467>] ? psb_driver_load+0x47f/0x4b6
> kristoffer@...gieman:~$ 
> 
> See what it expects for backlight type at init.
> Btw, if you are lazy then just clone my git repository with latest and greatest for gma500.
> 
> Best wishes
> Kristoffer
> 

Matthew's patch added backlight type: Documentation/ABI/stable/sysfs-class-backlight

Could you Please try the folllowing patch? 


>>From 71893f42dfe7fdc1fa81adc5c9ad49079603dcbd Mon Sep 17 00:00:00 2001
From: Lee, Chun-Yi <jlee@...ell.com>
Date: Sat, 16 Apr 2011 04:44:12 +0800
Subject: [PATCH] gma500: add backlight type


Signed-off-by: Lee, Chun-Yi <jlee@...ell.com>
---
 drivers/staging/gma500/psb_bl.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/gma500/psb_bl.c b/drivers/staging/gma500/psb_bl.c
index 70c17b3..05487de 100644
--- a/drivers/staging/gma500/psb_bl.c
+++ b/drivers/staging/gma500/psb_bl.c
@@ -136,6 +136,7 @@ int psb_backlight_init(struct drm_device *dev)
 
 	struct backlight_properties props;
 	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_RAW;
 	props.max_brightness = BRIGHTNESS_MAX_LEVEL;
 
 	psb_backlight_device = backlight_device_register("psb-bl", NULL,
-- 
1.6.0.2



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