[haiku-bugs] Re: [Haiku] #16341: Screen Preferences - bright slider don't work on Intel GMA (GM45)

  • From: "Haiku" <trac@xxxxxxxxxxxx>
  • To: undisclosed-recipients: ;
  • Date: Sat, 03 Oct 2020 14:20:10 -0000

#16341: Screen Preferences - bright slider don't work on Intel GMA (GM45)
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  Reporter:  un_spacyar                          |      Owner:  pulkomandy
      Type:  bug                                 |     Status:  new
  Priority:  normal                              |  Milestone:  Unscheduled
 Component:  Drivers/Graphics/intel_extreme/g45  |    Version:  R1/beta2
Resolution:                                      |   Keywords:
Blocked By:                                      |   Blocking:
  Platform:  All                                 |
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Comment (by pulkomandy):

 Hi,

 Sorry for the delay.

 Can you tell me the output of these two commands in KDL:

 {{{
 ie_reg 0x61250
 ie_reg 0x61254
 }}}

 These are the two registers that control the backlight for intel video
 cards. But on some machines, the manufacturer decided to not use this and
 connect the backlight control elsewhere. In that case, our attempts to
 change the brightness using this method will not work, of course. We have
 to find the correct way for that machine, then. Possibly ACPI could offer
 a better way to do this.
-- 
Ticket URL: <https://dev.haiku-os.org/ticket/16341#comment:1>
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