Permissions here are crw-rw----, and the card is accessible without a
problem by normal users. You may be missing this section in your
/etc/X11/xorg.conf:
Section "DRI"
Mode 0666
EndSection
Alternatively, make sure that you are member of the video group:
check the output of the 'groups' command.
--
gusty - xserver-xorg-core - wrong device permissions on /dev/dri/card0
(crw-rw----) instead of (crw-rw-rw-)
https://bugs.launchpad.net/bugs/135273
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Bugs, which is the bug contact for Ubuntu.
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