[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90320

Samir Ibradžić <sibradzic at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|DRI git                     |unspecified
          Component|DRM/Radeon                  |DRM/AMDgpu-pro

--- Comment #14 from Samir Ibradžić <sibradzic at gmail.com> ---
A year and a half later, BUMP again

- This bug is still happening on upstream kernels, just tried against 4.9 rc5
- It happens on latest amdgpu, with CIK support compiled
- It even happens with amdgpu-pro DKMS 16.40.5 @ Ubuntu 16.04 @ 4.4.0-47.68
which supposedly enables DAL (it doesn't want to compile on newer kernels)

The same implications as before, eDP is black, backlight control works,
external HDMI works.

It only works with fglrx, just checked with 15.20.2 (Feb 27 2015 build) @
Ubuntu 15.04 @ 4.0.0-040000-generic (ubuntu ppa kernel), display inits fine, X
works, but Gnome just dies on it, so I'm forced to use desktop that I can't
stand...

Whay would fglrx know how to enable eDP, when all other fail? Is there some
dark display initialization voodoo magic in there that is not in amdgpu-pro
DAL? Some sort of workaround in the code dedicated to handle some buggy eDP
link training or i2c link issues that are known for some LCD displays?

Please Help

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