linux-kernel - Re: 3.5 regression on i915

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Message-ID: <20121006075956.GF21163@1wt.eu>
Date:	Sat, 6 Oct 2012 09:59:56 +0200
From:	Willy Tarreau <w@....eu>
To:	Dave Airlie <airlied@...il.com>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org
Subject: Re: 3.5 regression on i915

On Sat, Oct 06, 2012 at 03:43:56AM -0400, Dave Airlie wrote:
> On Sat, Oct 6, 2012 at 3:27 AM, Willy Tarreau <w@....eu> wrote:
> > On Sat, Oct 06, 2012 at 01:58:45AM +0200, Willy Tarreau wrote:
> >> On Sat, Oct 06, 2012 at 09:48:57AM +1000, Dave Airlie wrote:
> >> > Any reason you don't have KMS, you'll keep hitting these non-kms bugs
> >> > since it has no users anymore really.
> >> >
> >> > Granted they'll get fixed, but I suspect its a losing battle over time.
> >>
> >> Well, back in old times every time I tried to enable it, I only ran into
> >> problems so I got used to disable it, which made sense since it didn't
> >> bring me any benefit.
> >
> > OK I found why in the end. When I enable KMS, my X server fails to start
> > and segfaults in intel_drv.so. So I think that the comment in Kconfig
> > below is quite appropriate :
> 
> Okay are you running a really old userspace? just wondering what could
> cause this.

yes, my Xorg is 1.4.2 and xf86-video-intel is 2.7.1.

I have additional information, I retested with 3.4.12 with and without KMS :

   3.4.12, no KMS : X works fine
   3.4.12, KMS    : X works fine but some garbage follows the mouse pointer
                    on the external display
   3.5.x   no KMS : kernel BUG
   3.5.x   KMS    : X server segfaults in intel driver

So in fact, both the KMS/non-KMS confs have regressed in 3.5 on this setup.

It is possible that the commit which removed the list of pinned inactive
objects (1b50247a) has uncovered another long-time bug.

Regards,
Willy

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