linux-kernel - thinkpad_acpi does not generate correct ACPI events when brightness

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Message-ID: <BAY156-W333AEB3C478890404DB815A3C50@phx.gbl>
Date:	Sat, 19 Nov 2011 02:14:12 -0500
From:	小龙 陈 <chillermillerlong@...mail.com>
To:	<linux-kernel@...r.kernel.org>
Subject: thinkpad_acpi does not generate correct ACPI events when
 brightness_enable=0

Hi!
I'm having a problem with the thinkpad_acpi kernel module where it does notgenerate a brightness down ACPI event when the "brightness_enable=0" parameteris set. This only happens when the module is automatically loaded at boot andafter resume from suspend.
Everything is fine once I run:
  rmmod thinkpad_acpi  modprobe thinkpad_acpi brightness_enable=0
The "acpi_listen" command shows this following when either the brightness up orbrightness down button is pressed:
  ibm/hotkey LEN0068:00 00000080 00006050
and also the following when the brightness up button is pressed:
  video/brightnessup BRTUP 00000086 00000000
The following brightness down ACPI event is only generated after the module isreloaded:
  video/brightnessdown BRTDN 00000087 00000000
Is this a known bug (or even a bug at all)? The kernel bugzilla is down.
Also, I apologize if the kernel mailing list is the wrong place to post this.If this belongs somewhere else, I'd appreciate it if someone told me where.
Regards,Xiao-Long Chen