[Bug 104158] [CFL][regression][bisected] Black screen since 4.14.4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104158

--- Comment #41 from Abhijeet Kumar <abhijeet.kumar at intel.com> ---
In past I've worked on exactly similar issue. After boot, only cursor and clock
at bottom was visible. And the reason i could root cause was that the
user-space was sending commits too fast.

By applying the below patch, I could fix it.

drm/i915: Always wait for flip_done, v2.
The next commit removes the wait for flip_done in in
drm_atomic_helper_commit_cleanup_done, but we need it for the tests
to pass. Instead of using complicated vblank tracking which ends
up being ignored anyway, call the correct atomic helper. :)

Changes since v1:
- Always call drm_atomic_helper_wait_for_flip_done,
  even for legacy cursor updates. (danvet)

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  3 +-
 drivers/gpu/drm/i915/intel_display.c | 84 +++---------------------------------
 2 files changed, 8 insertions(+), 79 deletions(-)


Maybe you wanna try ?

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