[Bug 74628] [eDP regression] blank screen on boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74628

--- Comment #3 from Paulo Zanoni <przanoni at gmail.com> ---
Created attachment 93568
  --> https://bugs.freedesktop.org/attachment.cgi?id=93568&action=edit
Patch with debugging option

Hi

This patch adds a Kernel command line option that will help us debug the
problem.

Please apply the patch, then try booting with:
- i915.edp_delays=0
- i915.edp_delays=1
- i915.edp_delays=2
- i915.edp_delays=3
- i915.edp_delays=4

And please tell us which ones solve the bug for you.

If you discover that i915.edp_delays=4 solves the problem for you, you could
also try removing chunks of code that look for "i915.edp_delays ==
EDP_DELAYS_I915_OLD" until you get a minimal set of checks that are essential
to get your Kernel working. But this could easily take you a few hours of
debugging :)

Thanks,
Paulo

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