On 04/13/2009 03:53 AM, Zhang Rui wrote:
> please attach the acpidump output.
> please apply this patch and see if it helps,
> http://patchwork.kernel.org/patch/17339/
>   
Hi,

The patch you mention above has no effect when applied to the latest
2.6.30-rc1 git kernel. I'm still unable to control brightness, and the
display is still blank on resume (unless I press both a keyboard key and
touch the synaptic pad).

dmesg shows:
thinkpad_acpi: ThinkPad ACPI Extras v0.22
thinkpad_acpi: http://ibm-acpi.sf.net/
thinkpad_acpi: ThinkPad BIOS 6FET50WW (1.20 ), EC 7VHT12WW-1.01
thinkpad_acpi: Lenovo ThinkPad W500, model 40622XG
thinkpad_acpi: radio switch found; radios are enabled
thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness
control, supported by the ACPI video driver
thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
Registered led device: tpacpi::thinklight
Registered led device: tpacpi::power
Registered led device: tpacpi::standby
thinkpad_acpi: Standard ACPI backlight interface available, not loading
native one.
pci 0000:00:02.0: power state changed by ACPI to D0

but /sys/class/backlight still is empty.

acpidump output attached, please let me know if I can test anything else
or provide more info...

thanks
Niel