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    SubjectRe: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys
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    please attach the acpidump output.
    please apply this patch and see if it helps,
    http://patchwork.kernel.org/patch/17339/

    thanks,
    rui

    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,
    >
    > 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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