Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys

From: yakui_zhao <yakui.zhao@intel.com>
To: Niel Lambrechts <niel.lambrechts@gmail.com>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Andrew Morton <akpm@linux-foundation.org>,
	"linux.kernel" <linux-kernel@vger.kernel.org>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	mjg59@srcf.ucam.org
Subject: Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys
Date: Mon, 13 Apr 2009 09:21:35 +0800	[thread overview]
Message-ID: <1239585695.5564.5.camel@localhost.localdomain> (raw)
In-Reply-To: <49E234ED.5010105@gmail.com>

On Mon, 2009-04-13 at 02:37 +0800, Niel Lambrechts wrote:
> On 04/12/2009 06:14 PM, Henrique de Moraes Holschuh wrote:
> > On Sat, 11 Apr 2009, Andrew Morton wrote:
> >   
> >>> With latest git kernel, I'm no longer able to control my Thinkpad (W500)
> >>> brightness, although I can still control the backlight, bluetooth etc.
> >>>       
> >
> > Niels, something just occourred to me.  Is your problem the hotkeys, or the
> > brightness control itself?  Check /sys/class/backlight/*, please.  What do
> > you have in there?  Does it work?
> >   
> Hi Henrique,
Will you please check whether there exists the /sys/class/backlight/*/*?

If not, will you please load the i915 driver and see whether the
backlight can be controlled by hotkeys?(The CONFIG_DRM_I915_KMS should
be enabled in kernel configuration).

Thanks.
> 
> The directory is empty - this is when I used 2.6.30-rc1 (latest git)
> from yesterday. I'll keep retrying with the latest git kernels though.
> 
> The only additional observations I can provide is:
> 1) pulling/plugging the power cord does actually have an effect on the
> brightness.
> 2) resuming form hibernate - Xorg is blank, until I simultaneously press
> a keyboard key and touch the synaptics pad. But I have this problem in
> 2.6.28/2.6.29 as well, and I guess it could either be vesafb or ACPI
> related, as it also happened when I used s2disk in a console session
> outside of X.
> 
> In 2.6.29.1:
> lrwxrwxrwx 1 root root 0 Apr 12 20:01 /sys/class/backlight/acpi_video0
> -> ../../devices/virtual/backlight/acpi_video0
> 
> which contains:
> drwxr-xr-x 3 root root    0 Apr 12 20:01 ./
> drwxr-xr-x 3 root root    0 Apr 12 20:01 ../
> -r--r--r-- 1 root root 4096 Apr 12 20:02 actual_brightness
> -rw-r--r-- 1 root root 4096 Apr 12 20:02 bl_power
> -rw-r--r-- 1 root root 4096 Apr 12 20:02 brightness
> -r--r--r-- 1 root root 4096 Apr 12 20:01 max_brightness
> drwxr-xr-x 2 root root    0 Apr 12 20:02 power/
> lrwxrwxrwx 1 root root    0 Apr 12 20:01 subsystem ->
> ../../../../class/backlight/
> -rw-r--r-- 1 root root 4096 Apr 12 20:01 uevent
> 
> max_brightness = 15 and echoing values [0-15] to brightness controls it
> as expected, or just using the standard thinkpad keys (Fn-Home to increase).
> > If it is the hotkeys, make sure you either have the legacy ACPI events
> > enabled in kconfig, or that you have something tied to the thinkpad-acpi
> > input device (no, HAL doesn't do it _yet_, it just forwards the events to
> > X.org)...
> >   
> I'm not sure what provides the "glue", other than "it works" in 2.6.29.1
> and 2.6.28.9 with OpenSUSE 11.1 with xorg-x11-server-7.4-41.8.
> 
> Would it help if I send the ACPI parts of my .config? These are based on
> the default /proc/config.gz that comes with the distro.
> 
> # Power management and ACPI
> options                                                               
> CONFIG_ACPI=y                                                                                     
> 
> CONFIG_ACPI_SLEEP=y                                                                               
> 
> CONFIG_ACPI_PROCFS=y                                                                              
> 
> CONFIG_ACPI_PROCFS_POWER=y                                                                        
> 
> CONFIG_ACPI_SYSFS_POWER=y                                                                         
> 
> CONFIG_ACPI_PROC_EVENT=y                                                                          
> 
> CONFIG_ACPI_AC=m                                                                                  
> 
> CONFIG_ACPI_BATTERY=m                                                                             
> 
> CONFIG_ACPI_BUTTON=m                                                                              
> 
> CONFIG_ACPI_VIDEO=m                                                                               
> 
> CONFIG_ACPI_FAN=m                                                                                 
> 
> CONFIG_ACPI_DOCK=y
> CONFIG_ACPI_PROCESSOR=m
> CONFIG_ACPI_HOTPLUG_CPU=y
> CONFIG_ACPI_THERMAL=m
> CONFIG_ACPI_CUSTOM_DSDT_FILE=""
> # CONFIG_ACPI_CUSTOM_DSDT is not set
> CONFIG_ACPI_BLACKLIST_YEAR=2001
> # CONFIG_ACPI_DEBUG is not set
> # CONFIG_ACPI_PCI_SLOT is not set
> CONFIG_ACPI_CONTAINER=m
> CONFIG_ACPI_SBS=m
> CONFIG_X86_ACPI_CPUFREQ=m
> CONFIG_X86_POWERNOW_K7_ACPI=y
> CONFIG_X86_POWERNOW_K8_ACPI=y
> CONFIG_HOTPLUG_PCI_ACPI=m
> CONFIG_HOTPLUG_PCI_ACPI_IBM=m
> CONFIG_PNPACPI=y
> CONFIG_BLK_DEV_IDEACPI=y
> CONFIG_ATA_ACPI=y
> CONFIG_PATA_ACPI=m
> CONFIG_THINKPAD_ACPI=m
> # CONFIG_THINKPAD_ACPI_DEBUGFACILITIES is not set
> # CONFIG_THINKPAD_ACPI_DEBUG is not set
> CONFIG_THINKPAD_ACPI_BAY=y
> CONFIG_THINKPAD_ACPI_VIDEO=y
> CONFIG_THINKPAD_ACPI_HOTKEY_POLL=y
> CONFIG_ACPI_WMI=m
> # CONFIG_ACPI_ASUS is not set
> CONFIG_ACPI_TOSHIBA=m
> 
> Regards,
> Niel
> --
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