Comment 52 for bug 1791312

I have done a git bisect:
client@client-LIFEBOOK-AH531 ~/mylinux $ git bisect good
f8a2645ecede4eaf90b3d785f2805c8ecb76d43e is the first bad commit
commit f8a2645ecede4eaf90b3d785f2805c8ecb76d43e
Author: Christian König <email address hidden>
Date: Wed Apr 16 11:54:21 2014 +0200

    drm/radeon: improve PLL params if we don't match exactly v2

    Otherwise we might be quite off on older chipsets.

    v2: keep ref_div minimum

    Signed-off-by: Christian König <email address hidden>

:040000 040000 a2150329e19966a1eb911d1d1ac74e865f002b1b 7220bfcf2fad7f94f071376fdd5aedd3d358545c M drivers
client@client-LIFEBOOK-AH531 ~/mylinux $