this?
volumio@volumio:~$ sudo ls -al /sys/class/backlight
[sudo] password for volumio:
voSorry, try again.
[sudo] password for volumio:
total 0
drwxr-xr-x 2 root root 0 May 13 19:29 .
drwxr-xr-x 64 root root 0 Jan 1 1970 …
lrwxrwxrwx 1 root root 0 May 13 19:29 fb_ili9486 → …/…/devices/platform/soc/fe204000.spi/spi_master/spi0/spi0.0/backlight/fb_ili9486
Thanks!
I can see brightnet settings on plugins config settings so I will try it.
Regards C
@nadirfly Regarding the touch function: The display has no ADS7846 touch controller but an XPT2046. Please try removing all entries from your “/boot/userconfig.txt” except dtparam=spi=on.
Interesting… please additionally post the the output of
sudo ls -al /sys/devices/platform/soc/fe204000.spi/spi_master/spi0/spi0.0/backlight/fb_ili9486
sudo ls -al /sys/devices/platform/soc/fe204000.spi/spi_master/spi0/spi0.0/backlight/fb_ili9486
ls: cannot access ‘/sys/devices/platform/soc/fe204000.spi/spi_master/spi0/spi0.0/backlight/fb_ili9486’: No such file or directory
now after editing the config.txt file I no longer have the brightness adjustment
… and no longer the error message, I guess?
no! but touch not work
Well, this is not the display you confirmed to me before. 
Instead your display seems to be this one.
i’m desolate.
yes is this 3.5inch HDMI Display-B - LCD wiki
That display has an ADS7846 touch controller… so you would probably have to add the ads7846 overlay and its params back to your “/boot/userconfig.txt”. After that please again execute
sudo ls -al /sys/devices/platform/soc/fe204000.spi/spi_master/spi0/spi0.0/backlight/fb_ili9486
and post the result.
total 0
drwxr-xr-x 3 root root 0 May 13 20:04 .
drwxr-xr-x 3 root root 0 May 13 20:04 …
-r–r–r-- 1 root root 4096 May 13 20:58 actual_brightness
-rw-rw-rw- 1 root root 4096 May 13 20:04 bl_power
-rw-rw-rw- 1 root root 4096 May 13 20:05 brightness
lrwxrwxrwx 1 root root 0 May 13 20:58 device → …/…/…/spi0.0
-r–r–r-- 1 root root 4096 May 13 20:58 display_name
-r–r–r-- 1 root root 4096 May 13 20:04 max_brightness
drwxr-xr-x 2 root root 0 May 13 20:04 power
-r–r–r-- 1 root root 4096 May 13 20:58 scale
lrwxrwxrwx 1 root root 0 May 13 20:04 subsystem → …/…/…/…/…/…/…/…/…/class/backlight
-r–r–r-- 1 root root 4096 May 13 20:58 type
-rw-r–r-- 1 root root 4096 May 13 20:04 uevent
Does the error message still occur?
Did you already add
dtoverlay=vc4-kms-v3d-pi4
to “/boot/userconfig.txt” and does that help with the touch function?
this is my file now… the error is gone… but the touch not work!
dtparam=spi=on
dtoverlay=vc4-kms-v3d-pi4
#dtoverlay=ads7846
#dtparam=cs=1
#dtparam=penirq=25
#dtparam=penirq_pull=2
#dtparam=speed=50000
#dtparam=swapxy=0
#dtparam=pmax=255
#dtparam=xohms=150
#dtparam=xmin=200
#dtparam=xmax=3900
#dtparam=ymin=200
#dtparam=ymax=3900
#dtoverlay=piscreen,speed=16000000,rotate=90
Try with
dtparam=spi=on
dtoverlay=vc4-kms-v3d-pi4
dtoverlay=ads7846
dtparam=cs=1
dtparam=penirq=25
dtparam=penirq_pull=2
dtparam=speed=50000
dtparam=swapxy=0
dtparam=pmax=255
dtparam=xohms=150
dtparam=xmin=200
dtparam=xmax=3900
dtparam=ymin=200
dtparam=ymax=3900
i don’t know… but this touch don’t wont run!
Does this imply that the touch function does not work with the settings from my previous post?
tomorrow i’ll try ex-novo installation with this repo from start