ubuntu-x-swat team mailing list archive

[psfblair <ciriwe@xxxxxxxxxx>]

I figured out my issue with getting software rasterization -- it was the
permissions on the device. Based on this bug report here:

http://bugs.freedesktop.org/show_bug.cgi?id=19492

I tried both "glxinfo" and "sudo glxinfo" and noted that in the former
case I got software rasterization, while in the latter case I was
getting "Mesa DRI Radeon..." As recommended in that bug report I set the
permissions on /dev/dri/card0 to 0666 and am now getting Mesa DRI when
I'm not the root user as well. Now EXA acceleration seems to be working
quite well.

Martin Olsson wrote:

> @Rolf, note that loading the glx module explicitly doesn't do anything for recent X.org 
> versions (it's autoloaded and so is "dri" module). Further, the permissions on the dri 
> device node are also no longer in use because that device now has an ACL on it (so the 
> "Mode 0666" stuff is obsolete). If you do "ls -l /dev/dri/card0" you will notice that the 
> permissions have a small "+" char next to it, that indicates the presence of an ACL. 
> You can see the ACL using the command "getfacl /dev/dri/card0".

Interestingly, the permissions on the dri device node apparently still
do have some relevance; at least they made a big difference in my case.
Is there perhaps a bug lurking here?

** Bug watch added: freedesktop.org Bugzilla #19492
   https://bugs.freedesktop.org/show_bug.cgi?id=19492

-- 
very poor Xorg performance on various older graphics HW - XAA solves this
https://bugs.launchpad.net/bugs/363238
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