I have been doing some reading. In the DTS file for the BB-BONE-LCD4-01-00A1.dts, there is the PWM settings which is currently set to 500000 which is in nanoseconds, which is 2Khz. Which is good. Changing this value to 1000000 which is 1Khz, and then running this command: dtc -O dtb -o BB-BONE-LCD4-01-00A1.dtbo -b 0 -@ BB-BONE-LCD4-01-00A1.dts to compile it I then restarted, and the frequency was still 2Khz.
Can anyone suggest what I am not doing or something else I need to do? Thanks Terry On Wednesday, 25 September 2013 23:10:18 UTC+12, Terry Storm wrote: > > Hi > Yes I have the same thing, the slider does not seem to do anything. > Changing the PWM value with the echo does however. > Yes I have backlight.10 also, maybe with older releases it was .11, I am > not sure. > > For interests sake, where would I find the place where the PWM for the > backlight is controlled from? > I would like to find out how to change the PWM frequency. I believe it is > currently set at 2Khz. > Is this possible to change to 1Khz for example? > If so, could someone point me to where I need to look? > > I have run Android 4.2.2 successfully and checked the PWM frequency on > that too, and that is also 2Khz. > > Regards > Terry > > On Saturday, 14 September 2013 05:18:42 UTC+12, [email protected]: >> >> I just installed latest (Angstrom 3.8.13 June 18) from >> http://beagleboard.org/latest-images/ and have 'backlight.10' in >> /sys/class/backlight. I can echo values to >> /sys/class/backlight/backlight.10/brightness successfully - but the GUI >> slider has no effect. I can slide it, but nothing happens. >> How can I troubleshoot this issue? I'm not sure where to find error >> messages - nothing shows up in dmesg. Do I need a serial cable for this? >> Why does everyone else have backlight.11 when I have backlight.10? >> I tried to make a symlink called backlight.11 but it wouldn't let me - >> even if I tried putting it in /devices/../.. >> >> My hardware is BBB Rev A5C with LCD screen 4DCAPE-43T Rev 1.11 >> >> Thanks Koen! >> >> On Wednesday, May 29, 2013 5:20:58 AM UTC-4, Koen Kooi wrote: >> >>> Ehm, it has had backlight control ever since LCD4 support was added. I >>> have an LCD4 plugged into a BBB and it shows a /sys/class/backlight/ and >>> has a slider in the GUI. >>> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
