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List:       haiku-bugs
Subject:    [haiku-bugs] Re: [Haiku] #17545: Screen Preferences - bright slider don't work on Intel GMA (i945GME
From:       "Haiku" <trac () haiku-os ! org>
Date:       2022-03-28 19:38:43
Message-ID: 056.c626197737cdf929a62d7621c8f43e5e () haiku-os ! org
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#17545: Screen Preferences - bright slider don't work on Intel GMA (i945GME)
-------------------------------------------------+-------------------------
  Reporter:  bruno                               |      Owner:  pulkomandy
      Type:  bug                                 |     Status:  new
  Priority:  low                                 |  Milestone:  Unscheduled
 Component:  Drivers/Graphics/intel_extreme/9xx  |    Version:  R1/beta3
Resolution:                                      |   Keywords:  Intel
                                                 |  GMA(i945GME)
Blocked By:                                      |   Blocking:
  Platform:  x86                                 |
-------------------------------------------------+-------------------------
Comment (by pulkomandy):

 Can you enter KDL (use Alt+PrintScreen+d or use the kernel_debugger
 command in terminal) and type the following commands:

 {{{
 ie_reg 0x61254
 ie_reg 0x61354
 }}}

 And give us the results?

 You can use the "continue" command to exit from KDL.


 ----


 Technical details for other devs looking at this bugreport:

 There seem to be two different backlight control registers for these old
 Intel graphics generations, one for each pipe. We are always using the one
 for pipe A currently. Maybe this machine needs the one on pipe B?

 If this doesn't work, I assume the backlight is driven in some other way.
 In that case, maybe the acpi display driver will be of more help.
-- =

Ticket URL: <https://dev.haiku-os.org/ticket/17545#comment:4>
Haiku <https://dev.haiku-os.org>
The Haiku operating system.
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