[Bug 100215] [SNB][IVB][BAT] kms_cursor_legacy at basic-busy-flip-before-cursor-atomic fails in CI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100215

--- Comment #7 from krisman at collabora.co.uk ---
(In reply to Chris Wilson from comment #2)
> Both are due to a prolonged hpd event interrupting userspace, e.g.:
> 
> [  337.504999] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status
> 0x7145003f
> [  337.505013] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
> error: -110

Chris,

I can reproduce this issue on a i5-2450M on very rare occasions.  It reproduced
at least twice in over 400 attempts.  In an i7-2620M, I couldn't trigger it.

Once again, I don't have anything connected to DP, but the following is logged:

[  510.536908] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7143003f 
[  510.539555] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7143003f 
[  510.542180] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7143003f 
[  510.542194] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110    

Do you have any test case to trigger it faster?

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