has the i915 "black screen" boot issue returned?

[Robert P. J. Day]

On Thu, 27 Jan 2011, Chris Wilson wrote:

> On Wed, 26 Jan 2011 06:37:20 -0500 (EST), "Robert P. J. Day" <rpjday at crashcourse.ca> wrote:
> >
> >   after suffering through the i915 "black screen" issue for a while,
> > it was a relief that it finally seemed to be resolved with 2.6.37 or
> > something in tha vicinity.  but i just built and booted a 2.6.38-rc2+
> > kernel on my ubuntu 10.10 system and it once again boots to a black
> > screen.
> >
> >   is this a new known issue?  has anyone else seen this?
>
> It all depends. There is a new ACPI backlight issue causing grief,
> aside from that and lingering issues with the legacy backlight
> combination mode, I don't think there was a new i915 KMS regression.
> (We had regressions elsewhere and finally fixed up a few old
> regressions for UMS and DRI1 and various other OOPS-on-boot. And
> suspend is a bit hit and miss.)
>
> For extra fun, it appears that sched_autocgroup can trigger a leak of
> pinned bo eventually hitting a BUG. That's one I'm keen to reproduce.
>
> Without knowing your chipset and seeing a dmesg, I can only guess which
> problem you are most likely to have hit.

  if i have time today, i'll try to bisect.  i've built a 2.6.38-rc2
kernel and that seems to work fine.  more in a bit while i track this
down.

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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