Problem with QtQuick process in arm with mali.(EGL error)

PeiSy

Hi, all
I'm getting confused about my QtQuick program.
I'm using Qt5.12.8 in armhf and LXDE desktop.

if I log in as user, and excute it , the gui displays successfully, but i need to change some system file, so i need to excute it with sudo. then i get some error.

Unable to set double buffer mode!(Invalid argument)
     …
     …
    EGL Error: Could not create the egl surface : error = 0x3003

If i log in desktop as root, everything is ok. But clearly, it is not a suitable solution for me.

Is everyone konwn this problem?
Thanks.

PeiSy

Can someone help me solve this problem?
I would be very grateful.

SGaist

Hi and welcome to devnet,

What exactly do you need to modify ?
How are you starting your application ?

PeiSy

hi, SGaist. Thanks for your reply.
First, login into the Desktop with 'user', then, just start my application normally, it's worked and show me the ui. But when i use sudo to start it, the app can not start successfully. And I got some error like this:

Unable to set double buffer mode!(Invalid argument)
     …
     …
EGL Error: Could not create the egl surface : error = 0x3003

If I login into Desktop with 'root', then start it. Everything is ok, but it not a good way for my work.
May some environment variables are not set when i start it with sudo？ I feel too weak for this problem. : (

PeiSy

Well , I need to start my application with sudo in "user" account.

SGaist

By default root does not have access to the X server through sudo. You have to explicitly enable that.

However this raises the question as to why do you need to run your GUI with root access ?

PeiSy

@SGaist I need to modify some system file that own by root. After my test, all qml/quick application could not started with sudo. And get the same error like before.
btw, the system is debian:buster and linaro

SGaist

Which files do you need to modify ?

PeiSy

@SGaist Thanks for your reply. I have solved it.
I found that it was using root env when started my application with sudo.
So i changed it in /etc/sudoer

Defaults    env_reset    ---->  Defaults   !env_reset

But i don't konw why. T_T