apparent workaround for i915 "black screen" issue

[Robert P. J. Day]

On Mon, 31 Jan 2011, selvamuthukumar v wrote:

> On Mon, Jan 31, 2011 at 6:46 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
> > On Mon, 31 Jan 2011, selvamuthukumar v wrote:
> >
> >> On Sat, Jan 29, 2011 at 4:13 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
> >> >
> >>
> >> > diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
> >> > index 64fd644..28adc6d 100644
> >> > --- a/drivers/gpu/drm/i915/intel_opregion.c
> >> > +++ b/drivers/gpu/drm/i915/intel_opregion.c
> >> > @@ -495,6 +495,8 @@ int intel_opregion_setup(struct drm_device *dev)
> >> >                opregion->acpi = base + OPREGION_ACPI_OFFSET;
> >> >        }
> >> >
> >> > +return 0; // rday
> >> > +
> >> >        if (mboxes & MBOX_SWSCI) {
> >> >                DRM_DEBUG_DRIVER("SWSCI supported\n");
> >> >                opregion->swsci = base + OPREGION_SWSCI_OFFSET;
> >> >
> >> >
> >>
> >> Yes. I was also facing similar issue. This workaround works for me.
> >> Tested using lenovo R61.
> >
> >  so you're saying that you were persistently getting a black screen
> > boot, but that that simple tweak solved the problem?  i'm not scared
> > to admit that i still don't understand *how* that fixes things, i was
> > just following the guidance of the appropriate mailing list and, so
> > far, things have been working.  i'm sure there will be a formal fix in
> > the near future.
> >
>
> Yes. I was getting black screen consistently. I do not remember
> exactly from which version issue started happening. But behavior was
> different with different kernel version. In 2.6.37 I used to get
> scrambled output. In 2.6.38-rc2 I get black screen, but CAPSLOCK LED
> is blinking continuously, probably a kernel panic. With this
> workaround I get the desktop.

  ok, thanks for clearing that up.  i still haven't heard back from
the intel mailing list so if anyone wants to try to narrow things down
further, feel free.  i don't know why this fixes things but, until i
do, i'm just going to keep applying this patch to my git build.

rday

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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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