[ltp] T61 Brightness keys with 2.6.26 not working (NVIDIA)

[Henrique de Moraes Holschuh]

On Tue, 22 Jul 2008, Jens Rutschmann wrote:
>>> The brightness_down button does nothing. Also in acpi_listen I get:
>>> ibm/hotkey HKEY 00000080 00001010
>>> for brightness_up, brightness_down does nothing.
>>
>> Find out what is writing crap to hotkey_mask, and stop it.
>
> Fixed it by enabling CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO.

Good, but that still doesn't explain the lack of thinkpad-acpi events for
brightness_down when _up is issuing events...  That's typical of a bad
hotkey_mask.

> Btw after booting "hotkey_mask" and "hotkey_recommended_mask" contain the 
> same values now. After booting into X I get this:
>
> hotkey_all_mask                 0x00ffffff
> hotkey_bios_enabled             0
> hotkey_bios_mask                0x0000080c
> hotkey_enable                   1
> hotkey_mask                     0x008c7fff
> hotkey_poll_freq                10
> hotkey_radio_sw                 1
> hotkey_recommended_mask         0x008c7fff
> hotkey_report_mode              1
> hotkey_source_mask              0x00000000

Which is good, and supposed to disable BOTH brightness keys.

> If you're interested in the hotkey_mask as it has been set before I 
> activated CONFIG_ACPI_VIDEO, then let me know and I'll compile a kernel 
> without it.

Don't bother, there simply is no failure mode (other than a broken BIOS)
that could have caused it, it must be something in userspace that tried to
set the hotkey_mask when ACPI VIDEO was not available or somesuch.

-- 
  "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