linux-kernel - Re: has the i915 "black screen" boot issue returned? [BISECTED]

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Date:	Fri, 28 Jan 2011 10:08:07 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Chris Wilson <chris@...is-wilson.co.uk>
cc:	dri-devel@...ts.freedesktop.org, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: has the i915 "black screen" boot issue returned? [BISECTED]

On Fri, 28 Jan 2011, Chris Wilson wrote:

> On Fri, 28 Jan 2011 09:51:01 -0500 (EST), "Robert P. J. Day" <rpjday@...shcourse.ca> wrote:
> >   sadly, no change -- still black screen.  again, rebooted
> > successfully under commit 8a327f23.  just to be clear, here's "git
> > diff":
> >
> > $ git diff
> > diff --git a/include/linux/acpi_io.h b/include/linux/acpi_io.h
> > index 7180013..e035f3c 100644
> > --- a/include/linux/acpi_io.h
> > +++ b/include/linux/acpi_io.h
> > @@ -7,7 +7,7 @@
> >  static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
> >                                             acpi_size size)
> >  {
> > -       return ioremap_cache(phys, size);
> > +       return ioremap(phys, size);
> >  }
>
> Ok, that implies the new mapping is fine and not the cause of the issue.
>
> Instead you have some OpRegion related regression hidden until till now
> because the conflicting mapping disabled it for i915.
>
> That would be easy to test by returning early in intel_opregion_setup():
>
> diff --git a/drivers/gpu/drm/i915/intel_opregion.c
> b/drivers/gpu/drm/i915/intel_
> index 9efccb9..8c93201 100644
> --- a/drivers/gpu/drm/i915/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> @@ -470,6 +470,8 @@ int intel_opregion_setup(struct drm_device *dev)
>         u32 asls, mboxes;
>         int err = 0;
>
> +       return -ENOTSUPP;
> +
>
>         pci_read_config_dword(dev->pdev, PCI_ASLS, &asls);
>         DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);
>         if (asls == 0) {
>

so you want me to revert to a stock b705120e before doing the above?

rday

-- 

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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