thinkpad_acpi does not generate correct ACPI events when brightness_enable=0

thinkpad_acpi does not generate correct ACPI events when brightness_enable=0

[小龙 陈]

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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 		 	   		  ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: thinkpad_acpi does not generate correct ACPI events when brightness_enable=0

[Henrique de Moraes Holschuh]

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