[Bug 84309] [byt] Linux console may not output after reboot.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84309

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Rick from comment #2)
> test 3.17.0-rc7, 30 times pass, occurrence 0/30
> 
> How do I merge the change into 3.14 series?

The first step is *finding* the change that makes the difference. It may be
it's not just one change, but a series of changes. To give you an idea what
kind of haystack you're looking for the needle in, there have been 1300+
changesets merged into the i915 driver alone between v3.14 and v3.17, with a
diffstat of: 67 files changed, 25925 insertions(+), 9362 deletions(-). That
doesn't even include the drm core changes.

You could try to do a reverse git bisect to find the commit that fixed the
issue for you. It's roughly 14 build/test steps. For example
https://wiki.ubuntu.com/Kernel/KernelBisection has this explained.

Once you've found the commit(s), the next step is backporting the fixes back to
v3.14, preferrably contributing them to the longterm stable v3.14.
Unfortunately they may not be directly applicable to v3.14, and a lot of work
may be required.

Finally, this is upstream bugzilla, and we have fixed the issue upstream, thus
I'm closing the bug. We may be able to help if you identify the working commit.
HTH.

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