linux-kernel - Re: Linux 2.6.29-rc2

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Date:	Tue, 27 Jan 2009 10:27:13 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Paul Rolland (ポール・ロラン) 
	<rol@...be.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29-rc2

On Saturday, January 17, 2009 10:33 am Paul Rolland wrote:
> Hello,
>
> On Fri, 16 Jan 2009 12:58:55 -0800 (PST)
>
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > It's out there now, or at least in the process of mirroring out.
>
> I'm getting this that I didn't have previously when running 2.6.28
> (and I think 2.6.29-rc1) :
>
> [drm:drm_wait_vblank] *ERROR* failed to acquire vblank counter, -22
> [drm:drm_wait_vblank] *ERROR* failed to acquire vblank counter, -22
>
> This seems to occur when X is running to turn off the screen due to
> inactivity...

This indicates that userspace was trying to wait for an event on a pipe that 
was disabled.  There are some fixes in Mesa to help avoid that (especially at 
app startup time); for the most part though they're harmless, since Mesa will 
eventually figure out which pipe to wait on and you won't see additional 
errors.

-- 
Jesse Barnes, Intel Open Source Technology Center
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