Public bug reported:
libdrm 2.4.1 in Jaunty is configured with --enable-udev, so the device node
/dev/dri/card* now is created via udev and patch 01_default_perms.diff does not
help to set the right permissions anymore.
Therefore /dev/dri/card0 now gets file permissions crw-rw----. This results in
poor performance, for example in sauerbraten and glxgears. Changing the
permissions to 666 gives the old performance again.
On my system I have created the file
/etc/udev/rules.d/45-dev-dri-permissions.rules with the line:
KERNEL=="card[0-9]", MODE="0666"
to automatically give /dev/dri/card0 the right permissions.
I think either a rule like that must be shipped in libdrm2 or a similar
rule must be added to /etc/udev/rules.d/40-permissions.rules in udev.
Please note:
Section "DRI"
Mode 0666
EndSection
in xorg.conf does not work anymore to set the permissions (see bug 303011).
libdrm2 2.4.1-0ubuntu7
kernel 2.6.28-2-generic, amd64
** Affects: libdrm (Ubuntu)
Importance: Undecided
Status: New
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libdrm 2.4.1 needs udev rule for /dev/dri/card*
https://bugs.launchpad.net/bugs/306014
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