linux-kernel - Re: [PATCH] drm/i915: Disable high-precision vblank timestamping for UMS

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Message-Id: <b7da2f$q7be7q@fmsmga001.fm.intel.com>
Date:	Sun, 23 Jan 2011 12:44:10 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	chris2553@...glemail.com
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: Disable high-precision vblank timestamping for UMS

On Sun, 23 Jan 2011 11:28:22 +0000, Chris Clayton <chris2553@...glemail.com> wrote:
> Hi Chris,
> 
> On Sunday 23 January 2011, Chris Wilson wrote:
> > We only have sufficient information for accurate (sub-frame) timestamping
> > when the modesetting is under our control.
> >
> With this patch (and the earlier one) applied, X still doesn't start. At the end 
> of xorg's log file I see:
> 
> Fatal server error:
> Failure to wait for IRQ: No such device

Now we are getting closer! The X server has been caught red-handed trying
to use an interrupt when the driver never enabled them. Ho hum.

The interrupts for UMS are only enabled between EnterVT/LeaveVT, but that
code looks defunct. What version of xf86-video-intel are you using?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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