#17545: Screen Preferences - bright slider don't work on Intel GMA (i945GME)
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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 |
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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.
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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.
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Ticket URL: <https://dev.haiku-os.org/ticket/17545#comment:4>
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