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

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Message-ID: <20111119154423.GA11743@khazad-dum.debian.net>
Date:	Sat, 19 Nov 2011 13:44:23 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	小龙 陈 <chillermillerlong@...mail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: thinkpad_acpi does not generate correct ACPI events when
 brightness_enable=0

On Sat, 19 Nov 2011, 小龙 陈 wrote:
>   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

This is an auxiliary event, only available in certain Lenovo boxes, and
thinkpad-acpi doesn't do much with it.

> 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.

It is probably a bug, yes.  But where?  You're looking at acpi video output,
not thinkpad-acpi output.  The ACPI firmware clearly is changing its
behaviour when thinkpad-acpi is reloaded, which probably means it is broken
and it will have to be worked around if a BIOS update doesn't fix it.  That
wouldn't be surprising at all...

Are you using the latest BIOS/EC firmware for your thinkpad?

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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