[Bug 199567] [amdgpu] just a black screen irrespective of amdgpu.dc=1 or 0 at boot on kernels 4.17-rc2 and onwards

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199567

--- Comment #3 from Ant (untaintableangel@hotmail.co.uk) ---
Sorry for the delay. OK, so lots of news:

I did see a patch in amd-staging-drm-next 
354ee4815f52219fcd97d91269917261aac0518a ("drm/amd/display: Fix bug that causes
black screen") that sounded ideal but I couldn't apply it cleanly since it's
too out of sync.

After a git bisect, I was pleasantly surprised that the 3 main patches between
rc-1-rc2 for amd/display stuff were all fine. Looks like it's something else
entirely.

I tested out an ubuntu mainline kernel and it worked fine, so the problem is
something different in my custom .config, I guess. Something that has been fine
for 4.17-rc1 and kernels before that but suddenly needs to change for rc2
onwards.

(Bug still present on 4.17-rc5 btw)


last good: 5e747dd9be54be190dd6ebeebf4a4a01ba765625
first bad: 43838a23a05fbd13e47d750d3dfd77001536dd33

commit 43838a23a05fbd13e47d750d3dfd77001536dd33
Author: Theodore Ts'o <tytso@mit.edu>
Date:   Wed Apr 11 13:27:52 2018 -0400

    random: fix crng_ready() test

    The crng_init variable has three states:

    0: The CRNG is not initialized at all
    1: The CRNG has a small amount of entropy, hopefully good enough for
       early-boot, non-cryptographical use cases
    2: The CRNG is fully initialized and we are sure it is safe for
       cryptographic use cases.

    The crng_ready() function should only return true once we are in the
    last state.  This addresses CVE-2018-1108.

    Reported-by: Jann Horn <jannh@google.com>
    Fixes: e192be9d9a30 ("random: replace non-blocking pool...")
    Cc: stable@kernel.org # 4.8+
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Reviewed-by: Jann Horn <jannh@google.com>


I'm looking into my config options for RNG/random stuff, but this bug can
probably be bounced somewhere more appropriate now :)

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