What is the best method to automatically ensure that the display backlight is on after boot? Initially the screen is white then switches to faint graphics (backlight off). Thank you! Kevin.
On Wednesday, 23 November 2016 02:33:47 UTC+13, Kevin Gordon wrote: > > I have built a new host from debian-8.6.0-amd64-CD-1.iso and included > eclipse mars.2 with debugging for > bone-debian-8.4-lxqt-4gb-armhf-2016-05-13-4gb.img.xz installed on a BBB > with a 7 inch LCD cape. > At the beginning of uEnv.txt I included as a first line: > dtb=am335x-boneblack-emmc-overlay.dtb > For file capemgr: > root@beaglebone:/etc/default# nano capemgr > GNU nano 2.2.6 File: capemgr > # Default settings for capemgr. This file is sourced by /bin/sh from > # /etc/init.d/capemgr.sh > # Options to pass to capemgr > CAPE=BB-BONE-LCD7-01:00A3 > I added the above last line: CAPE=BB-BONE-LCD7-01:00A3 > root@beaglebone:/# cat /sys/devices/platform/bone_capemgr/slots > 0: PF---- -1 > 1: PF---- -1 > 2: PF---- -1 > 3: PF---- -1 > 4: P-O-L- 0 Override Board Name,00A3,Override Manuf,BB-BONE-LCD7-01 > Which I believe means the cape is loaded. > The above is working satisfactorily except the display is very faint. I > can turn on the backlight with: > Manually: > root@beaglebone:~# echo 1 > /sys/class/backlight/backlight/bl_power > Or: > echo 1 | sudo tee /sys/class/backlight/backlight/bl_power > Placed in .bashrc > These turned the backlight on but seemed to cause some mouse and screen > instability. If I don't do this everything is stable but so faint that the > display is almost unreadable. > This is a first attempt by me. Any comments or improvements would be much > appreciated. > Many thanks, > Kevin. > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/99b96d90-081c-4695-8f67-e02b7e82431c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
