[Bug 87682] Horizontal lines in radeon driver on kernel 3.15 and upwards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87682

--- Comment #9 from Thom <madeforspam at telfort.nl> ---
(In reply to Chris Bainbridge from comment #8)

> This is not correct. The 77/69 does not imply a linear ordering because of
> forks:
> Trust git ;-)

Thanks for the update, that explains everything. I hardly know git, and before
yesterday I didn't even know what git or what bisecting was...it's a bit
overwhelming.

> 
> > c2fb3094669a3205f16a32f4119d0afe40b1a1fd is the first bad commit
> 
> Not familiar with this code, but from the patch the PLL values are printed
> out:
> 
>          DRM_DEBUG_KMS("%d - %d, pll dividers - fb: %d.%d ref: %d, post
> %d\n",
>                       freq, *dot_clock_p * 10, *fb_div_p, *frac_fb_div_p,
>                       ref_div, post_div);
> 

That is like magic :-) How did you get git to give you the source of that patch
so quickly  ?
(I googled for hours on this stuff without success) 

> So suggest enabling debug log and compare those two lines from a working and
> non-working kernel.
>

I assume that I have to enable debug log via a bootoption because I couldn't
find anything in menuconfig that wasn't already marked for inclusion.
What bootoption do I have to use to enable the right (and right amount of)
debug logging ? (and after that, where do I find the log output?)

> It should also be trivial to checkout a recent tag and revert the bad commit

I don't even know yet what that is or how to do that, even after reading the
man pages about checkout, tag, revert and commit; but I'm convinced I'll get
there in the end ;-)

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