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

[Linus Torvalds <torvalds@osdl.org>]

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
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