Comment # 14
on bug 87682
from Thom
(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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