[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109122

--- Comment #3 from Matej Lach <me at matej-lach.me> ---
I can confirm this bug is indeed present. 
Worth noting that the screen is only blank on the laptop built-in display,
(after KMS), external monitors work fine. 

Adding `amdgpu.dc=0` to the kernel parameters resolves the issue for me, but
this was not necessary before kernel 4.19.9, so it seems like a regression. [1]
seems related.

1 - https://bugzilla.kernel.org/show_bug.cgi?id=200695

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