linux-kernel - Re: is there a fix for ubuntu with intel GPU booting to blank screen?

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Date:	Sat, 1 Jan 2011 06:18:02 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Maxim Levitsky <maximlevitsky@...il.com>
cc:	Anca Emanuel <anca.emanuel@...il.com>,
	Ubuntu kernel team mailing list 
	<kernel-team@...ts.ubuntu.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: is there a fix for ubuntu with intel GPU booting to blank
 screen?

On Fri, 31 Dec 2010, Maxim Levitsky wrote:

> On Fri, 2010-12-31 at 12:01 -0500, Robert P. J. Day wrote:
> > On Fri, 31 Dec 2010, Maxim Levitsky wrote:
> >
> > ... snip related to i915 blank screen issues ...
> >
> > > Since you know how to compile kernel, and even have a close working
> > > version, you really should just bisect the bug.
> > >
> > > Bisection is a built-in in the git binary search that allows you to
> > > find the first commit that introduced the bug.
> > >
> > > For example, quick google gives,
> > > http://www.kernel.org/pub/software/scm/git-core/docs/v1.0.13/howto/isolate-bugs-with-bisect.txt
> >
> >   oh, i know how to do bisection but, to be frank, i just don't have
> > the time.  i'm under a brutal deadline for some billable work and,
> > even if i had the time, i suspect that when i eventually tracked down
> > the commit, i probably wouldn't really appreciate what i was looking
> > at, anyway.

> You truly underestimate this. Having commit that broke things points
> perfectly at the issue. Then, developers can even just revert the
> offending commit until it is understood why it breaks stuff.

  one of the difficulties (if i'm reading this correctly) is that the
issue isn't even reliably reproducible.  a number of people who have
reported this claim that *sometimes* the system boots properly but
it's hit and miss, so it's not even clear you can bisect
deterministically.

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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