Re: #Desktop file manager and screen blanking issues #desktop

Basil Gunn

Hi Bernard,

Second issue first: File Manager instantly closes when opened
The solution can be found here:

The file manager used in Raspbian is called pcmanfm, you must re-install it.

sudo apt-get install --reinstall pcmanfm

First issue:
Disclaimer I do NOT use the raspbian GUI very much so this is my limited

One of my monitors, Sceptre model E16 (12v monitor), stopped working with
buster running on an RPi 4. I got it displaying again by
putting the following in the /boot/config.txt file.

# Enable DRM VC4 V3D driver on top of the dispmanx display stack

What I would do is collect some data to see if you can understand the
problem better. Look at:
- monitor model
- video connector used, ie. HDMI,
- all the hdmi settings in /boot/config.txt,
- raspberry pi model,
- kernel version

This is what I am currently using for testing on my bench:

machine kern RPi video Monitor
plutest 4.19.75 Pi 4 Model B HDMI Sceptre 16"
nwdr15plu2 4.19.93 Pi 3 Model B HDMI Sunfounder 10" touch
ardop2 4.19.75 Pi 3 Model B+ HDMI Sunfounder 10"
mhams 4.14.98 Pi 3 Model B HDMI Sunfounder 10"

Also you will get more eyes looking at your problem if you post your
description on the RaspberryPi-4-HamRadio site.

/Basil n7nix

f6bvp <> writes:

With nwdr15.img and recently with nwdr14.img I observed same
desktop issues on two different Raspberry Pi models 3B+ and 4 and two
different screen displays models. *These issues are not present on
latest RaspBian distro september 2019 with same 4.19.93 kernel and all
applications updated.*

First issue is with screen blanking. I had to disable it in preference
menu for it was impossible to recover a display after it was
blanked. Sometime unplugging the UDMI plug could recover a normal
display but usually a reboot was needed.

Second issue is with File Manager desktop icon. When clicking on the
icon it opens a file window very briefly and close it right away. At
the same time all desktop icons disappear for a brief moment and
reappear on the desktop.

73 de Bernard, f6bvp

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