Re: rc6 keeps hanging and blanking displays where rc4-mm1 works fine.

[Helge Hafting]

Linus Torvalds wrote:

> On Fri, 12 Aug 2005, Helge Hafting wrote:
>  
>
> > > at the moment. The setup is fine with 2.6.13-rc4-mm1 x86-64, no 
> > > problems there.
> > >      
> > The problem still exists in 2.6.13-rc6.  Usually, all I get is a 
> > suddenly black display, solveable by resizing.
> >    
>
> Is there any chance you could try bisecting the problem? Either just 
> binary-searching the patches or by using the git bisect helper scripts?
>
> Obviously the git approach needs a "good" kernel in git, but if 
> 2.6.13-rc4-mm1 is ok, then I assume that 2.6.13-rc4 is ok too? That's a 
> fair number of changes:
>
> 	 git-rev-list v2.6.13-rc4..v2.6.13-rc6 | wc
> 	    340     340   13940
>
> but if you can tighten it up a bit (you already had trouble at rc5, I 
> think), it shouldn't require testing more than a few kernels.
>
> Git has had bisection support for a while, but the helper scripts to use 
> it sanely are fairly new, so I think you'd need the git-0.99.4 release for 
> those. But then you'd just do
>
> 	git bisect start
> 	git bisect bad v2.6.13-rc5
> 	git bisect good v2.6.13-rc4
>
> and start bisecting (that will check out a mid-way point automatically, 
> you build it, and then do "git bisect bad" or "git bisect good" depending 
> on whether the result is bad or good - it will continue to try to find 
> half-way points until it has found the point that turns from good to 
> bad..)
>
> 		Linus
>  
Ok, I have downlaoded git and started the first compile.
Git will tell when the correct point is found (assuming I
do the "git bisect bad/good" right), by itself?

Is there any way to make git tell exactly where between rc4 and rc5
each kernel is, so I can name the bzimages accordingly?

It takes some time to trigger the bug, so I could possibly end up with
a falsely ok kernel.  Is there a simple way to restart the search from 
that point,
or will I have to start over with rc4 and rc5 and say
git bisect good/bad until I reach the point of mistake?

Helge Hafting


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