Raspberry hanging after a while.

[SergioRius]

I've been looking at this problem for some time. My intention is replace a Cerbo with this rPi4. It is a new install Venus v3.55 in a new fresh SD. This is a Sandisk High endurance so I don't expect problems from here. I also installed a 7" touch screen (no hdmi) that with RpiDisplaySetup works so nice.

The problem is that after some time, the interface goes black and the RPi hangs. I can see the system doing something just before hanging, like showing only the battery tile and a Loading thing. It happens so fast.

I didn't got anything from the logs, so today I uninstalled the RpiDisplaySetup so I could get something on the terminal before the crash, but surprise, it's working for quite few hours without crashing.

So it seems that the screen driver has something to do.
What could I do to debug this situation?

PS: It doesn't seem to be the screen sleep function, as it does work independently from the problem.
Is possible to disable screen sleep to check if that's the problem?

[kwindrem]

RpiDisplaySetup does a few simple things to the config.txt file and sets up screen blanking and dimming if appropriate. I can't see how this could cause the problem you are seeing.

config.txt additions flagged with #### RpiDisplaySetup begin:
screen rotate
HDMI modes (not an issue in your case since you aren't using HDMI)

and also:
set up screen blanking
set up screen dimming

optimally run touchscreen calibration

remove /etc/venus/headless so local display functions

[SergioRius]

RpiDisplaySetup does a few simple things to the config.txt file and sets up screen blanking and dimming if appropriate. I can't see how this could cause the problem you are seeing.

Would be possible to activate the display but not setting up screen dimming and sleep?
For Debug purposes. -> YES, Now testing.

The fact is that with the driver uninstalled still is running without hanging for more than one day.

[SergioRius]

I setup the local display without configuring blanking and dimming and it's been operative for 3 days so far.

Edit: Would you mind sharing the procedure for only enabling screen blanking?

[kwindrem]

I didn't consider this option when I wrote the RpiDisplaySetup setup script. The easiest way may be to not select custom blanking and dimming in the script then adding the blanking file manually:

cat "/sys/class/backlight/rpi_backlight/bl_power" > /etc/venus/blank_display_device

and removing the dimming file:

rm -rf /etc/venus/backlight_device

then rebooting

this will work until RpiDisplaySetup/setup runs again which happens at startup after a firmware update so probably only good for testing.

[SergioRius]

I didn't consider this option when I wrote the RpiDisplaySetup setup script. The easiest way may be to not select custom blanking and dimming in the script then adding the blanking file manually:

cat "/sys/class/backlight/rpi_backlight/bl_power" > /etc/venus/blank_display_device

and removing the dimming file:

rm -rf /etc/venus/backlight_device

then rebooting

this will work until RpiDisplaySetup/setup runs again which happens at startup after a firmware update so probably only good for testing.

The rPi has been running with the driver installed without the screen dimming using the above procedure. No issues.
I'm sure that it's the dimming. Is there any overlay that only applies when dimming is active?

[kwindrem]

That would depend totally on the display and how Venus OS interacts with it.

I don't know what actually happens under the hood as dimming is handled by the core of Venus OS. I just set the device to control.