From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 29726] New CRTC ID query breaks Radeon DRM in Zaphod mode
Date: Sun, 24 Oct 2010 22:09:03 -0700 (PDT)
Message-ID: <20101025050903.D020713000D@annarchy.freedesktop.org>
References: <bug-29726-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=29726

--- Comment #7 from Alex Deucher <agd5f@yahoo.com> 2010-10-24 22:09:03 PDT ---
(In reply to comment #6)
> I was thinking you actually meant the .drirc setting rather than an actual
> environment variable but you were right. Setting this in .drirc makes no
> difference but the environment variable does indeed make the problem go away.
> 

It's works in the .drirc as well, but it requires slightly different handling
for dri2 drivers, e.g.,

<driconf>
    <device screen="0" driver="dri2">
        <application name="Default">
            <option name="vblank_mode" value="0" />
        </application>
    </device>
</driconf>

> I quite like vsyncing so I'm a little sad if it's broken. I think it was
> working before?

It wasn't supported before.  KMS vsync support was added with the commit cited
in this bug.

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