[Bug 71977] [BYT] Modesetting on Dell Venue 8 Pro (Bay Trail) produces garbled output (3.11, 3.12) or blank screen (3.13)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71977

--- Comment #20 from Benjamin Tissoires <benjamin.tissoires at gmail.com> ---
Created attachment 92711
  --> https://bugs.freedesktop.org/attachment.cgi?id=92711&action=edit
xorg.conf with 800x1280 modeset

I managed to get kms + X working on a Lenovo Miix 2 today (basically same chip
that the Dell Venue pro 8) with 3.13 + F20:
I used both hints given by Jacek: append "video=VGA-1:800x1280 at 60" to the
command line and revert commit 6c4a8962a4a078cacfc8eb5d4bd79f6343b8cd7a.

This gives a good kms on a 3.13 kernel (no black screen anymore, console OK),
but X fails with garbled display. So I just add the correct mode to xorg.conf
(attached), and it's ok now.

I will try later the latest intel-drm tree to see if it has been fixed
upstream, but I think it is "just" that the intel CRC do not manage to get the
correct EDID to the attached display.

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