Re: Only one user has DRI

Hmm.. I don't think the DRI will work for multiple concurrent users on
the same computer.  Why?  Well, DRI - from what I understand - is
direct rendering.  That means putting the data directly into the
display buffer.  You really do not want more than one program at a
time dumping data directly to the video card.  Imagine running two
highly graphics intensive games at the same time, like GLQuake and
Half-Life 2 (maybe my gaming knowledge is a bit outdated, but you know
what I mean).  You can't play both full-screen at the same time
without having some trouble with frame rates - if you can play them at
all.  Why would you want two users to run graphics applications on the
same graphics card at the same time anyhow?  After all, you only have
one display connected at a time (if you have a dual-head card, this
actually still counts as a single display, since only one user can
access both monitors).

Now, if you are having trouble with non-root users accessing the DRI,
you need to just add a DRI section to your xorg.conf file, and make it
with either a  "Mode 0666" line or a "Group <group-name>" entry.
Remember, no quotes, but the <group-name> should be quoted, and the
group it represents should include any user you want to have access to
the DRI.

Garry

On Nov 4, 2007 8:31 AM, Jacob <[email protected]> wrote:
>
> On Sat, 3 Nov 2007 16:14:43 -0700 (PDT)
> Peter Gaston <[email protected]> wrote:
>
> > My video card is an old AGP Powercolor Radeon 9250 (r200). Using
> > the open source ATI Xorg drivers, I can get DRI to work for only
> > the first user that logs in. This is shown by the result of
> > running "glxinfo | grep 'direct rendering'", which outputs
> > "direct rendering: Yes" but "No" for all subsequent users.
> >
> > I need DRI so I can do fast user switching between two users
> > using Compiz or playing and pausing a 3D game like Openarena. So
> > logging off the first user isn't the ideal solution.
> >
> > What do I need to do to enable DRI for all logged in users?
> >
> >
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> This occurs for me as well, but only if I have more than one user logged in. Are you logging out of past users first? (This is with a completely different driver and card, by the way.)
>
> --
>     Jacob
>
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