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Old 05-17-2017, 05:43 AM   #1
Peewe
LQ Newbie
 
Registered: May 2017
Posts: 8

Rep: Reputation: Disabled
DRM Double-Buffered VSync'ed Modesetting


Hey everyone,
I'm trying to write a driver which print things on the screen, by searching in Google I found that code :

https://github.com/dvdhrm/docs/blob/...odeset-vsync.c

After make and run this code I get this output :

root@MY-VirtualBox:/home/MY/Desktop/docs-master/drm-howto# ./modeset-vsyncusing card '/dev/dri/card0'
mode for connector 26 is 1920x1080
cannot set CRTC for connector 26 (13): Permission denied
cannot flip CRTC for connector 26 (13): Permission denied
wait for pending page-flip to complete...
exiting

Did someone can help me understand what I need to do to make it work ?
Thank you all and have a great day!!
 
Old 05-18-2017, 05:31 AM   #2
hunkemoller
LQ Newbie
 
Registered: Oct 2013
Distribution: ubuntu
Posts: 5

Rep: Reputation: Disabled
generally ... to access devices the 'user' would require extra permission ... [ie admin/superuser] , whilst your user prompt indicates 'root' , are you running as root? ...

what are the permissions on the device (ls -l .... )

you may want to run a debugger and step through.
 
  


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