git bisect start
# bad: [bfeffd155283772bbe78c6a05dec7c0128ee500c] Linux 5.0-rc1
git bisect bad bfeffd155283772bbe78c6a05dec7c0128ee500c
# good: [8fe28cb58bcb235034b64cbbb7550a8a43fd88be] Linux 4.20
git bisect good 8fe28cb58bcb235034b64cbbb7550a8a43fd88be
# bad: [e0c38a4d1f196a4b17d2eba36afff8f656a4f1de] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
git bisect bad e0c38a4d1f196a4b17d2eba36afff8f656a4f1de
# bad: [c2f1f3e0e17d94ab0c66d83e669492cb9e9a3698] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next
git bisect bad c2f1f3e0e17d94ab0c66d83e669492cb9e9a3698
# bad: [b3cc2bfe7244e848f5e8caa77bbdc72c04abd17c] Merge tag 'i3c/for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux
git bisect bad b3cc2bfe7244e848f5e8caa77bbdc72c04abd17c
# bad: [2ac5e38ea4203852d6e99edd3cf11f044b0a409f] Merge drm/drm-next into drm-intel-next-queued
git bisect bad 2ac5e38ea4203852d6e99edd3cf11f044b0a409f
# good: [63ac3328f0d1d37f286e397b14d9596ed09d7ca5] drm/i915: fix broadwell EU computation
git bisect good 63ac3328f0d1d37f286e397b14d9596ed09d7ca5
# good: [d7563c55ef9fc1fd2301b8708b3c1f53509d6745] Merge tag 'drm-misc-next-2018-11-07' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
git bisect good d7563c55ef9fc1fd2301b8708b3c1f53509d6745
# bad: [ba45df4cb7193570e9fa4979b198ec313899417c] drm/amd/display: Expose target backlight level
git bisect bad ba45df4cb7193570e9fa4979b198ec313899417c
# good: [7cd52c917a9c9a90f7d303079576971dc1a1c4fc] drm/amdkfd: Add proper prefix to functions
git bisect good 7cd52c917a9c9a90f7d303079576971dc1a1c4fc
# good: [af70a471bf067d4e808eff2b9c464e6055c98d49] drm/amdgpu: cleanup amdgpu_ib_ring_tests
git bisect good af70a471bf067d4e808eff2b9c464e6055c98d49
# good: [c99155230b677236f79edc226fca80392cc84787] drm/amd/display: Add missing pipes registers for VGA enable/disable
git bisect good c99155230b677236f79edc226fca80392cc84787
# good: [a7d8084b589714ea08bddd3720986b657840f46b] drm/amd/display: Remove some old TODO's
git bisect good a7d8084b589714ea08bddd3720986b657840f46b
# bad: [3917a470757cf55155663240481b1dda0206717b] drm/amd/display: Remove program_csc_matrix
git bisect bad 3917a470757cf55155663240481b1dda0206717b
# bad: [37c1346c2e36d187cd0f1d6b82292a946ba029e4] drm/amd/display: Fix some backlight variable styling
git bisect bad 37c1346c2e36d187cd0f1d6b82292a946ba029e4
# bad: [262485a50fd4532a8d71165190adc7a0a19bcc9e] drm/amd/display: Expand dc to use 16.16 bit backlight
git bisect bad 262485a50fd4532a8d71165190adc7a0a19bcc9e
# first bad commit: [262485a50fd4532a8d71165190adc7a0a19bcc9e] drm/amd/display: Expand dc to use 16.16 bit backlight