Jtdylktuy

I want to ensure that pyqt5 is working properly on my raspberry pi. When I try to run a tutorial producing a simple window, the code produces the desired results but an error message is thrown. The tutorial in question is from http://zetcode.com/gui/pyqt5/firstprograms/. The tutorial code is included at the end of this post.

The error message I get is

MESA-LOADER: device is not located on the PCI bus

MESA-LOADER: device is not located on the PCI bus

MESA-LOADER: device is not located on the PCI bus

qt5ct: using qt5ct plugin

inotify_add_watch("/home/pi/.config/qt5ct") failed: "No such file or directory"

The operating system is “Raspbian GNU/Linux 9 (stretch)" on which I have installed “Qt version 5.7.1”. The IDE is “Thonny” on which I am running “Python 3.5.3”.

I installed pyqt5 by running the following code:

sudo apt-get update

sudo apt-get install qt5-default pyqt5-dev pyqt5-dev-tools

Here is what I have tried.

The sources https://raspberrypi.stackexchange.com/questions/84703/qcamera-get-error-mesa-loader-failed-to-retrieve-device-information and https://github.com/RPi-Distro/repo/issues/89 suggested to update the libdrm.

I updated libdrm using these instructions https://github.com/anholt/mesa/wiki/VC4-complete-Raspbian-upgrade#libdrm. I ignored the instructions before the libdrm section. I was able to update libdrm without error messages. The result was changing the error message to the one listed above. Before updating libdrm, the error message was:

MESA-LOADER: failed to retrieve device information

MESA-LOADER: failed to retrieve device information

MESA-LOADER: failed to retrieve device information

qt5ct: using qt5ct plugin

inotify_add_watch("/home/pi/.config/qt5ct") failed: "No such file or directory"

Therefore, updating libdrm changed “failed to retrieve device information” to “device is not located on the PCI bus”.

I wanted to update Mesa to the newest version. For that, I wanted to check the currently installed Mesa version using the following terminal input:

glxinfo | grep "OpenGL version"

The output was:

libGL error: MESA-LOADER: failed to retrieve device information

MESA-LOADER: failed to retrieve device information

MESA-LOADER: failed to retrieve device information

OpenGL version string: 2.1 Mesa 13.0.6

This showed me that I am running Mesa version 13.0.6, while the most recent version is 19.0.0. I tried updating Mesa using these instructions: https://github.com/anholt/mesa/wiki/VC4-complete-Raspbian-upgrade#mesa. I ignored the instructions before the Mesa section. The code executed without error messages up to the “make” command, where the following error message was thrown:

make: *** No targets specified and no makefile found.  Stop.

Even knowing where to dig deeper would be a big help for me. Should I look into reinstalling pyqt5 or focus mainly on Mesa?

Code:

#!/usr/bin/python3

# -*- coding: utf-8 -*-



import sys

from PyQt5.QtWidgets import QApplication, QWidget



if __name__ == '__main__':



    app = QApplication(sys.argv)



    w = QWidget()

    w.resize(250, 150)

    w.move(300, 300)

    w.setWindowTitle('Simple')

    w.show()



    sys.exit(app.exec_())