[Bug 58151] kernel 3.2.45 regression in i915 driver for 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

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https://bugzilla.kernel.org/show_bug.cgi?id=58151





--- Comment #8 from Nix\ <nix.sasl at gmail.com>  2013-05-23 04:56:29 ---
(In reply to comment #5)
> (In reply to comment #4)
> > (In reply to comment #3)
> > > (In reply to comment #0)
> > > > Using the same .config file on the same machine (Lenovo Thinkpad t400),
> > > > compiling 3.2.44 kernel no problem, compiling 3.2.45 no backlight and no video.
> > > > Disabling the modeseting by default on the .config and setting i915.modeset=0
> > > > the backlight works, but, no framebuffer, and no control of backlight using Fn
> > > > + Bright up/down.
> > > 
> > > This should be easy to bisect. See [1] for instructions. Just use the stable
> > > tree [2] if you aren't already using that.
> > > 
> > > [1]
> > > http://www.reactivated.net/weblog/archives/2006/01/using-git-bisect-to-find-buggy-kernel-patches/
> > > [2] git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> > 
> > @Jani Nikula:
> > 
> > Can you fix it upstream please?. I already "fixed" it for myself (workaround
> > i915.modeset=0 but no framebuffer and backlight control), but I'm asking you to
> > fix it upstream please.
> 
> I don't know the root cause here. Fixing it would be easier if you did the
> bisect, please. It means pinpointing the error introduced between v3.2.44 and
> v3.2.45 to a single commit in the source.
> 
> You could also try reverting 
> commit 19c42ce9869ff30f43a08fb774d08f35b92b5ff6
> Author: Jani Nikula <jani.nikula at intel.com>
> Date:   Fri Apr 12 15:18:38 2013 +0300
> 
>     drm/i915: ensure single initialization and cleanup of backlight device
> 
> which touches backlight code and see if that helps, but if it doesn't, it's
> just useless back and forth when one should've just done the bisect. (Note that
> I don't find anything obviously wrong with the commit.)

The steps in your blog no work, git say error, please give me a good guide for
bisect. Thank you.

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