git bisect start
# good: [1c163f4c7b3f621efff9b28a47abb36f7378d783] Linux 5.0
git bisect good 1c163f4c7b3f621efff9b28a47abb36f7378d783
# bad: [9e98c678c2d6ae3a17cb2de55d17f69dddaa231b] Linux 5.1-rc1
git bisect bad 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b
# good: [e266ca36da7de45b64b05698e98e04b578a88888] Merge tag 'staging-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect good e266ca36da7de45b64b05698e98e04b578a88888
# bad: [36011ddc78395b59a8a418c37f20bcc18828f1ef] Merge tag 'gfs2-5.1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
git bisect bad 36011ddc78395b59a8a418c37f20bcc18828f1ef
# bad: [4b057e73f28f1df13b77b77a52094238ffdf8abd] Merge tag 'drm-misc-fixes-2019-02-22' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
git bisect bad 4b057e73f28f1df13b77b77a52094238ffdf8abd
# bad: [c09d39166d8a3f3788680b32dbb0a40a70de32e2] drm/i915: Update DRIVER_DATE to 20190207
git bisect bad c09d39166d8a3f3788680b32dbb0a40a70de32e2
# bad: [8ca4fd0406b41a872055048d694f3702d8eddb76] Merge tag 'drm-intel-next-2019-01-10' of git://anongit.freedesktop.org/drm/drm-intel into drm-next
git bisect bad 8ca4fd0406b41a872055048d694f3702d8eddb76
# good: [8e93f1028d7434af58097eadf1f34ddfa7fe2b7e] drm/mxsfb: Use drm_fbdev_generic_setup()
git bisect good 8e93f1028d7434af58097eadf1f34ddfa7fe2b7e
# bad: [caa5915bb3c1e61bd895383364011a8921fee053] drm/i915/ringbuffer: Pull the render flush into breadcrumb emission
git bisect bad caa5915bb3c1e61bd895383364011a8921fee053
# bad: [d8e874980241dd1cee68e85c39d8e5372bbad494] drm/i915: Switch to level-based DDB allocation algorithm (v5)
git bisect bad d8e874980241dd1cee68e85c39d8e5372bbad494
# good: [4cf74aafc55bef8725d1d30f7d3449fb86c1710f] drm/i915: debug log for REPLY_ACK missing
git bisect good 4cf74aafc55bef8725d1d30f7d3449fb86c1710f
# bad: [e6154e4cb8b0d3692f84ca0d66b4e1ba0389b134] drm/i915: Skip the ERR_PTR error state
git bisect bad e6154e4cb8b0d3692f84ca0d66b4e1ba0389b134
# good: [490b8c65b9db45896769e1095e78725775f47b3e] drm/i915/execlists: Apply a full mb before execution for Braswell
git bisect good 490b8c65b9db45896769e1095e78725775f47b3e
# good: [5f5800a765de8414f6fb213c4ad4a1cf529e131d] drm/i915: Push EMIT_INVALIDATE at request start to backends
git bisect good 5f5800a765de8414f6fb213c4ad4a1cf529e131d
# bad: [e8894267cc3325901073e8adf0a63e2dc53b6242] drm/i915: Pipeline PDP updates for Braswell
git bisect bad e8894267cc3325901073e8adf0a63e2dc53b6242
# bad: [f2253bd9859bab65fdbc94bf5ce1876c403a11eb] drm/i915/ringbuffer: EMIT_INVALIDATE after switch context
git bisect bad f2253bd9859bab65fdbc94bf5ce1876c403a11eb
# first bad commit: [f2253bd9859bab65fdbc94bf5ce1876c403a11eb] drm/i915/ringbuffer: EMIT_INVALIDATE after switch context