apparent workaround for i915 "black screen" issue

[selvamuthukumar v]

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.

> rday
>
> --
>
> ========================================================================
> Robert P. J. Day                               Waterloo, Ontario, CANADA
>                        http://crashcourse.ca
>
> Twitter:                                       http://twitter.com/rpjday
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