Re: Unsupported brightness interface

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On Fri, Mar 27, 2015, at 04:11, Yves-Alexis Perez wrote:
> On dim., 2015-03-22 at 16:12 -0300, Henrique de Moraes Holschuh wrote:
> > On Sat, Mar 7, 2015, at 17:12, Jarmila Holcova wrote:
> > > Mar  7 20:34:47 OH-ThinkPad-Edge-E440 kernel: [   10.725697]
> > > thinkpad_acpi: Unsupported brightness interface, please contact
> > > ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
> > 
> > Thanks for the report.  You can ignore this error message.
> 
> Would it be worth dropping the message for those boxes?

Yes.  They are currently not really useful.

I think it would make sense to rework
tpacpi_detect_brightness_capabilities() to just pr_debug() something
like "firmware reports %d brightness levels" after it has processed the
result of tpacpi_check_std_acpi_brightness_support().

We should leave any complaining about supported/unsupported to
brightness_init(), so it would make sense to add a dbg_printk to
brightness_init that reports "unsupported brightness mode, use acpi
video or gpu drivers" when tp_features.bright_unkfw is not zero.

Care to send a patch?

-- 
  "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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