Re: apple_gmux bug

[Benoit Gschwind <gschwind@gnu-log.net>]

Hello Rolando,

I found that if you turn you computer in stanby (suspend to RAM) and 
turn it on again, gmux work again.

I didn't found a way ot enable this behaviour at boot.

Best regards

Le 24/01/2013 09:13, Benoit Gschwind a écrit :
> Hello Rolando,
>
> Do you use NVIDIA proprietary driver ?
>
> If this is the case, this explain your issue probably. NVIDIA driver
> seems disable gmux chips.
>
> Best regards.
>
> Le 24/01/2013 06:25, Rolando Martins wrote :
>> Hi,
>> I am currently experienced problems with the apple_gmux driver
>> while using a MBP retina 10,1.
>> System description & behavior:
>> -Ubuntu 13.04 with kernel 3.8-rc4.
>> -dmesg: apple_gmux: Found gmux version 3.2.19 [indexed]
>> -Under /sys/class/backlight I only have gmux_backlight.
>> -Under gmux_backlight both actual and max brightness are equal to 2^24
>> = 16777216,
>> while brightness value is within [0,1023] (the value can be changed)
>> -The backlight is dimmed throughout the boot process and remains the
>> same,
>> without being possible to adjust it.
>>
>> If the following hack is applied then full brightness can be achieved,
>> however it remains nonadjustable.
>>
>>   #define HACK_VALUE 1023
>>   ...
>>   In gmux_probe() :
>>   ...
>>   props.max_brightness = gmux_read32(gmux_data,
>> GMUX_PORT_MAX_BRIGHTNESS);
>>   //hack
>>   props.max_brightness = HACK_VALUE;
>>   ....
>>   bdev->props.brightness = gmux_get_brightness(bdev);
>>   //hack
>>   bdev->props.brightness = HACK_VALUE;
>>
>> Does anybody have a clue to solve this problem?
>>
>> Thanks for the help,
>> Rolando
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