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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #7 from Thom <madeforspam@telfort.nl> ---
Ok, I did my first bisect, it worked out well but I encountered something that
puzzles me a bit.
Here is the last part of the bisect:

3.15.0-rc3-00725-g1465967  bad

Bisecting: 658 revisions left to test after this (roughly 9 steps)
[e9dba837640d960f56bef22ff08611955ff8a5b4] Merge tag 'pm+acpi-3.15-rc3' of
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

3.15.0-rc2-00219-ge9dba83  bad

Bisecting: 355 revisions left to test after this (roughly 8 steps)
[6e66d5dab5d530a368314eb631201a02aabb075d] Merge branch 'for-next' of
git://git.samba.org/sfrench/cifs-2.6


3.15.0-rc1-00303-g6e66d5d good

Bisecting: 176 revisions left to test after this (roughly 8 steps)
[4d0fa8a0f01272d4de33704f20303dcecdb55df1] Merge tag 'gpio-v3.15-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

3.15.0-rc2-00042-g4d0fa8a good

Bisecting: 99 revisions left to test after this (roughly 7 steps)
[76e7745e8e4330fdb30f049303d524261c0b7a2c] Merge tag 'zynq-dt-fixes-for-3.15'
of git://git.xilinx.com/linux-xlnx into fixes

3.15.0-rc2-00077-g76e7745 good (how can this be ??)

Bisecting: 49 revisions left to test after this (roughly 6 steps)
[92891ed6b1fdb49655f9a071ef2880a567807375] Merge branch 'fixes_for_v3.15' of
git://git.linaro.org/people/mszyprowski/linux-dma-mapping

3.15.0-rc2-00092-g92891ed bad

Bisecting: 22 revisions left to test after this (roughly 5 steps)
[1aae31c8306e5f1bdeafd87b2cd9e3f0df3709e5] Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

3.15.0-rc2-00069-g1aae31c bad

Bisecting: 13 revisions left to test after this (roughly 4 steps)
[7740fc52105c9e6d2beac389a9ae0ce7138cf5ab] Input: soc_button_array - fix a
crash during rmmod

3.14.0-rc4-00065-g7740fc5 good

Bisecting: 6 revisions left to test after this (roughly 3 steps)
[3ed9a335cfc64b2c83545f341cdddf2347b12b97] drm/radeon/pm: don't walk the crtc
list before it has been initialized (v2)

3.15.0-rc1-00075-g3ed9a33 bad

Bisecting: 3 revisions left to test after this (roughly 2 steps)
[c2fb3094669a3205f16a32f4119d0afe40b1a1fd] drm/radeon: improve PLL limit
handling in post div calculation

3.15.0-rc1-00071-gc2fb309 bad

Bisecting: 0 revisions left to test after this (roughly 1 step)
[24315814239a3fdb306244c99bd076bc79db4ade] drm/radeon: use fixed PPL ref
divider if needed

3.15.0-rc1-00070-g2431581 good

c2fb3094669a3205f16a32f4119d0afe40b1a1fd is the first bad commit

commit c2fb3094669a3205f16a32f4119d0afe40b1a1fd
Author: Christian König <christian.koenig@amd.com>
Date:   Sun Apr 20 13:24:32 2014 +0200

    drm/radeon: improve PLL limit handling in post div calculation

    This improves the PLL parameters when we work at
    the limits of the allowed ranges.

    Signed-off-by: Christian König <christian.koenig@amd.com>

:040000 040000 5c3ac5ddf911c2c1f8926ecde2d83fdbcd6bb269
4731ceed6e1c149abd6fda6a06318700750f8

So far so good, but what I'm puzzled about is this:

As far as I understand; 3.15.0-rc2-00077-g76e7745 is a later revision (good)
than 3.15.0-rc2-00069-g1aae31c (bad) and an earlier revision than
3.15.0-rc2-00092-g92891ed (bad) which doesn't seem to make sense to me.

It is as if someone did a patch to improve on 3.15.0-rc1-00071-gc2fb309 but
that it got revoked afterwards, is that possible ?

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