[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 #14 from Thom <madeforspam at telfort.nl> ---
(In reply to Chris Bainbridge from comment #13)
> This might be https://bugzilla.kernel.org/show_bug.cgi?id=75241 - there is
> one line patch there from Christian König but it doesn't look like it was
> ever merged.

I did a git fetch origin , git reset --hard origin/master
to get a plain unaltered current kernel again (4.6.0-rc7+)

I changed the one line in ./drivers/gpu/drm/radeon/radeon_display.c:
    fb_div_max = pll->max_feedback_div;
to:
    fb_div_max = min(pll->max_feedback_div, 512u); 
according to:
    https://bugzilla.kernel.org/attachment.cgi?id=142281
    (linked from https://bugzilla.kernel.org/show_bug.cgi?id=75241)

and compiled (make && make modules_install install)

Assuming that i did not make a mistake or overlooked something;
this patch didn't work, lots of noise/artefacts.
Timings seem identical to the other "bad" compilations, i.e. nothing changed:

(bootparam drm.debug=4)
 [drm:radeon_compute_pll_avivo] 69300 - 69290, pll dividers - fb: 135.5 ref: 2,
post 14

too bad, but it was absolutely worth to try.
I wonder if "fb" and "post" are consequently too low....is that possible ?

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