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

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Date:	Sun, 23 Jan 2011 12:55:13 +0000
From:	Chris Clayton <chris2553@...glemail.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: Disable high-precision vblank timestamping for UMS

On Sunday 23 January 2011, Chris Wilson wrote:
> 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?

It's 2.7.1, which, IIRC, is the latest version that will build against all the 
other xorg libraries that are on my system. I'll do a quick check after lunch 
to see if any later versions will build without me going through dependency 
hell.

Thanks for your help so far,

Chris

> -Chris

-- 
The more I see, the more I know. The more I know, the less I understand. 
Changing Man - Paul Weller
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