git bisect start
# bad: [2ea659a9ef488125eb46da6eb571de5eae5c43f6] Linux 4.12-rc1
git bisect bad 2ea659a9ef488125eb46da6eb571de5eae5c43f6
# good: [e3d9e2b278ed801a37c3cd43e178e260b59bb97d] Linux 4.11.10
git bisect good e3d9e2b278ed801a37c3cd43e178e260b59bb97d
# good: [a351e9b9fc24e982ec2f0e76379a49826036da12] Linux 4.11
git bisect good a351e9b9fc24e982ec2f0e76379a49826036da12
# bad: [221656e7c4ce342b99c31eca96c1cbb6d1dce45f] Merge tag 'sound-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect bad 221656e7c4ce342b99c31eca96c1cbb6d1dce45f
# good: [8d65b08debc7e62b2c6032d7fe7389d895b92cbc] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
git bisect good 8d65b08debc7e62b2c6032d7fe7389d895b92cbc
# bad: [88582f5646927348d31424fa8bdb0f2d97a046c0] drm/rockchip: cdn-dp: Don't unregister audio dev when unbinding
git bisect bad 88582f5646927348d31424fa8bdb0f2d97a046c0
# good: [f6b50ef14ea84725c1b41c9ffea611cdfb71c7dd] drm/imx: ipuv3-plane: add support for separate alpha planes
git bisect good f6b50ef14ea84725c1b41c9ffea611cdfb71c7dd
# bad: [0cdd500560e233aef4e0749c9f014e9ee8f4d752] amdgpu: detect if we are using atomfirmware or atombios for vbios (v2)
git bisect bad 0cdd500560e233aef4e0749c9f014e9ee8f4d752
# good: [be5df20a34d78d986ddfb6e0fc87e4fa4d05268b] Merge tag 'drm-intel-next-2017-03-20' of git://anongit.freedesktop.org/git/drm-intel into drm-next
git bisect good be5df20a34d78d986ddfb6e0fc87e4fa4d05268b
# bad: [f6bd79424cd02f5726c294916d9afb3cf031080c] drm/amdgpu:use clear_ring to clr RB
git bisect bad f6bd79424cd02f5726c294916d9afb3cf031080c
# bad: [2da4da3cbe78ee6555b3999494b0f080d17f93b1] drm/amdgpu:minor cleanup
git bisect bad 2da4da3cbe78ee6555b3999494b0f080d17f93b1
# good: [7b34734816d5170f40329598390de22d0166e4e9] drm: vc4: remove redundant check of plane being non-null
git bisect good 7b34734816d5170f40329598390de22d0166e4e9
# bad: [8bcad07a45637fb88e799466e4eee83859e8ffd3] drm/i915/gvt: fix error return check for copy_gma_to_hva()
git bisect bad 8bcad07a45637fb88e799466e4eee83859e8ffd3
# good: [50dd1bd1e2395a78e5adfad96487092e215483e0] drm/edid: check for HF-VSDB block
git bisect good 50dd1bd1e2395a78e5adfad96487092e215483e0
# bad: [edd849e5448c4f6ddc04a5fa1ac5479176660c27] Merge tag 'drm-misc-next-2017-03-21' of git://anongit.freedesktop.org/git/drm-misc into drm-next
git bisect bad edd849e5448c4f6ddc04a5fa1ac5479176660c27
# good: [62c58af32c935a98a1e8d8ceb39a3a47b36fbbcd] drm/edid: detect SCDC support in HF-VSDB
git bisect good 62c58af32c935a98a1e8d8ceb39a3a47b36fbbcd
# first bad commit: [edd849e5448c4f6ddc04a5fa1ac5479176660c27] Merge tag 'drm-misc-next-2017-03-21' of git://anongit.freedesktop.org/git/drm-misc into drm-next