linux-kernel - Linux-2.6.31-rc4 - shut the annoying "failed to acquire vblank..."

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Message-ID: <20090728091622.50e9933b@tux.DEF.witbe.net>
Date:	Tue, 28 Jul 2009 09:16:22 +0200
From:	Paul Rolland <rol@...917.net>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	rol@...be.net
Subject: Linux-2.6.31-rc4 - shut the annoying "failed to acquire vblank..."

Hello,

I sent a mail long ago about this message :
tux kernel: [drm:drm_wait_vblank] *ERROR* failed to acquire vblank counter,
-22 showing up more than 10 times per second, but was told that I had some
old userspace apps running... As I was using an old FC8, I forgot about it.

But I'm now running a quite recent FC11, pure 64bit machine, and when I run
a vanilla kernel, I have this message showing again and again.

I propose to apply the following patch :

--- drm_irq.c.orig      2009-07-26 21:36:20.000000000 +0200
+++ drm_irq.c   2009-07-26 21:36:34.000000000 +0200
@@ -566,7 +566,7 @@
 
        ret = drm_vblank_get(dev, crtc);
        if (ret) {
-               DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
+               DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
                return ret;
        }
        seq = drm_vblank_count(dev, crtc);

to shut the message. This is at least what I do on my machine to have it
running quietly.

Anyway, if anyone care to explain why we have this "error", I'd be glad to
learn about it. 
And if anyone wants me to test some patches, I'll be glad to.

Regards,
Paul


-- 
Paul Rolland                                E-Mail : rol(at)witbe.net
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Les Collines de l'Arche                     Fax. +33 (0)1 47 67 77 99
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