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problem with IOGraphics-191.5/tools/setdparam.c

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problem with IOGraphics-191.5/tools/setdparam.c

Subject: problem with IOGraphics-191.5/tools/setdparam.c
From: Dirk Schelfhout <email@hidden>
Date: Tue, 26 Dec 2006 14:53:40 +0100

Hi,

When I run this code on my imac with external 23 inch display.

uname -a

Darwin intelImac.local 8.8.1 Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386 i386 i386

I get the following output :

[Session started at 2006-12-26 14:41:05 +0100.]

Display 424a6d5: IODisplayGetFloatParameter(-536870201), -1.999818

Display 4271600: IODisplayGetFloatParameter(0), 0.000000

bright has exited with status 0.

Which shows : err = IODisplayGetFloatParameter(service, kNilOptions, key, &value);

returning with -536870201

Is this code no longer up to date ? Should I file this as a bug ?

This is the code a bit simplified :

err = CGGetOnlineDisplayList(8, displayIDs, &max);

key = CFSTR(kIODisplayBrightnessKey);

service = CGDisplayIOServicePort(displayIDs[i]);

err = IODisplayGetFloatParameter(service, kNilOptions, key, &value);

Dirk

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