Created attachment 101249 [details]
Dmesg kernel 3.15 - screen black

Created attachment 101250 [details]
RegDump kernel 3.14.6 - working

Created attachment 101251 [details]
Dmesg kernel 3.14.6 - working

bisected to
commit 1ad292b51e358c8b6e9b8966889c21f1fe705489
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Fri Mar 7 08:57:49 2014 -0800

    drm/i915: get_plane_config for i9xx v13

Can you attach a dmesg from the failing case when booted with drm.debug=6?  I want to see the early allocation stuff we do.  It seems related to our stolen memory allocation somehow...

A patch to try after collecting the dmesg:

index 6441178..e849e5d 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -231,7 +231,7 @@ int i915_gem_init_stolen(struct drm_device *dev)
        DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
                      dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
 
-       if (IS_VALLEYVIEW(dev))
+       if (IS_VALLEYVIEW(dev) || 1)
                bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
 
        if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))

Created attachment 101845 [details]
Dmesg_BAD_drm.debug=6

(In reply to comment #5)
> Can you attach a dmesg from the failing case when booted with drm.debug=6? 
> I want to see the early allocation stuff we do.  It seems related to our
> stolen memory allocation somehow...

Done. Dmesg attached above...

(In reply to comment #6)
> A patch to try after collecting the dmesg:
> 
> index 6441178..e849e5d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -231,7 +231,7 @@ int i915_gem_init_stolen(struct drm_device *dev)
>         DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
>                       dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
>  
> -       if (IS_VALLEYVIEW(dev))
> +       if (IS_VALLEYVIEW(dev) || 1)
>                 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
>  
>         if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))

Got it...
Bypassing the test results in working graphics here.

(In reply to comment #9)
> (In reply to comment #6)
> > A patch to try after collecting the dmesg:
> > 
> > index 6441178..e849e5d 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> > @@ -231,7 +231,7 @@ int i915_gem_init_stolen(struct drm_device *dev)
> >         DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
> >                       dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
> >  
> > -       if (IS_VALLEYVIEW(dev))
> > +       if (IS_VALLEYVIEW(dev) || 1)
> >                 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
> >  
> >         if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
> 
> Got it...
> Bypassing the test results in working graphics here.

Can you try this patch (without Jesse's hack)?
http://patchwork.freedesktop.org/patch/27209/

Created attachment 101855 [details] [review]
[PATCH] drm/i915: Add a guard page between stolen and GTT

If http://patchwork.freedesktop.org/patch/27209/ alone doesn't fix it, you can also try to add this patch on top of that one.

(In reply to comment #10)
> (In reply to comment #9)
> > (In reply to comment #6)
> > > A patch to try after collecting the dmesg:
> > > 
> > > index 6441178..e849e5d 100644
> > > --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> > > +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> > > @@ -231,7 +231,7 @@ int i915_gem_init_stolen(struct drm_device *dev)
> > >         DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
> > >                       dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
> > >  
> > > -       if (IS_VALLEYVIEW(dev))
> > > +       if (IS_VALLEYVIEW(dev) || 1)
> > >                 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
> > >  
> > >         if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
> > 
> > Got it...
> > Bypassing the test results in working graphics here.
> 
> Can you try this patch (without Jesse's hack)?
> http://patchwork.freedesktop.org/patch/27209/

Success... With this patch only.

Do you want dmesg regdumps etc?

Here is the link to the Arch Linux bug report:

https://bugs.archlinux.org/task/40899

Bug fixed in 3.15.6 after Ville's patch got pulled.

Mainline is also working