[Bug 96996] [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96996

--- Comment #17 from Stephan Schorn <mail at schorn-stephan.de> ---
I am going to do a regdump of a working Windows 10 kernel and compare it to a
regdump of a current, not-working intel kernel. That way, I can be sure which
register values are the correct-ones. I still think hardsetting a working set
of values would lead to a working screen. CDCLK maybe just wasn't enough.

Although, I doubt the Windows values will differ from the nomodeset values.

Then I could, by debugging the kernel, try to find out when the first of these
values gets changed... There should be the problem.

Another approach I'm gonna try is to enable fastboot again.
I've seen in the code that an "if" that enables fastboot when the kernel
parameter is set, got a new condition around 2.7.0.

In my opinion, enabling fastboot again should also lead to a working screen.

Do you know whether the Android-IA kernel uses fastboot or not?

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170117/c3f9655d/attachment.html>