[SOLVED] Qt on Slackware Linux

Sleicreider

first one without root:

libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/i965_dri.so
libGL error: failed to open drm device: Permission denied
libGL error: failed to load driver: i965
libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/swrast_dri.so

with root:
Qt: Session management error: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/i965_dri.so
libGL: Can't open configuration file /root/.drirc: No such file or directory.

I also tried the second one.
Whats the reason, to redirect the output to /dev/null ^^

andreyc

About /dev/null.
It will hide your error messages and you will not worry about it. :-)

Some GNU/Linuxes have a "video" group and only members of that group are allowed to use opengl.
Could you check if Slackware has such restriction. If so then add your self to that video group re-login and try to run your app again.

Sleicreider

i just added my self with $usermod -aG video <username>
-> in /etc/group its says video:x:18:

but same error still appears.

andreyc

do you see the same error if you run "glxinfo":http://dri.freedesktop.org/wiki/glxinfo/ or glxgears
@
glxinfo
glxgears
@

Sleicreider

under normal user: for both
libGL error: failed to load driver: i965
libGL error: Try again with LIBGL_DEBUG=verbose for more details.

under root:

its seems to run without errors.

andreyc

what does the following commands show
@
id
ls -l /dev/dri
@

Sleicreider

I'll try it on monday when i'm on my workstation pc again :)

Sleicreider

bash-4.2$ id
uid=1000(username) gid=100(users) groups=100(users),18(video)

bash-4.2$ ls -l /dev/dri
total 0
crw-rw---- 1 root video 226, 0 Mar 24 08:32 card0
crw-rw---- 1 root video 226, 64 Mar 24 08:32 controlD64

andreyc

I'm running out of ideas :-)
Maybe this last one

Do you have Mesa libraries installed?
What ldd on your app shows?
@
ldd yourapp | grep libGL
@

And one more.
When you start qtcreator does it show the same error as your app?
If you build any Qt examples and start them do they show the same error?

Sleicreider

bash-4.2$ ldd myapp | grep libGL
libGL.so.1 => /usr/lib64/libGL.so.1 (0x00007f79fab6b000)

somehow i get no error anymore, lol.
(i started the same project)

I also started an OpenGL example. no errors.
:)

idk what happened.

andreyc

Glad to hear that issue is resolved.

Sleicreider

thank you ! :)

andreyc

Could you put [SOLVED] in front of the title of your initial post.