On 5/26/14, 7:20 PM, "Colin Bester" <[email protected]> wrote:
>Thanks John, I will look deeper into this.I have actually just switched
>over to debian OS and will test.
>
>One test I did do today was to write a zero '0' to brightness by
>executing "echo 0 > /sys/class/backlight/backlight.11/brightness"
When you write to ³brightness², which is defined as a sysfs attribute in
/driver/video/backlight/blacklight.c line 247
This calls ³backlight_store_brightness² on line 148. You can add a few
printk statements to understand what is happening or read up on Dynamic
Debugging which you will find in /Documents/dynamic-debug-howto.txt
Regards,
John
>
>This did reduce the brightness but didn't take it to zero light but does
>dim the display. Likewise a 50 is brighter and 100 is brightest.
>
>I am not sure if this is related in any way at all but will look more
>tomorrow.
>
>Cheers and thanks
>Colin
>
>On May 26, 2014, at 8:03 PM, John Syn <[email protected]> wrote:
>
>>
>> From: Colin Bester <[email protected]>
>> Reply-To: <[email protected]>
>> Date: Monday, May 26, 2014 at 4:54 PM
>> To: <[email protected]>
>> Subject: Re: [beagleboard] BBB LCD3 Cape and inactivity
>>
>>> Was wondering if you have come up with any further solution? I can
>>>write '0' to backlight brightness but while this dims the display
>>>significantly it doesn't switch if off.
>> Have you checked that EHRPWM1A is low when you dim the display? Here
>>are two files that will control the backlight.
>>
>> /driver/video/backlight/pwm_bl.c
>> /driver/pwm/pwm-tiehrpwm.c
>>
>> Regards
>> John
>>>
>>>
>>> On Thursday, December 19, 2013 3:07:52 PM UTC-6, Daniel Metcalf wrote:
>>>> Yes, I have experienced it and am still working on a solution.
>>>> Dan
>>>> On Dec 19, 2013 11:03 AM, "Colin Bester" <[email protected]> wrote:
>>>>> I have a beaglebone black with lcd3 cape installed and all appears
>>>>>find on startup.
>>>>>
>>>>> After a while of inactivity, the displays appears to go into some
>>>>>form of sleep or screen saver mode but backlight stays on. i.e., The
>>>>>normal GDM screen with background and icons switches to an all white
>>>>>display (just backlight).
>>>>>
>>>>> Is anyone else experiencing this?
>>>>>
>>>>> I would expect the backlight to switch off as well.
>>>>>
>>>>> Cheers
>>>>> Colin
>>>>>
>>>>> --
>>>>> For more options, visit http://beagleboard.org/discuss
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