[Bug 107668] Blank screen (Cannot find any crtc or sizes) since Kernel 4.17 (AMDGPU.DC) on Amd Radeon RX460 on HDMI LG Ultrawidescreen Monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107668

--- Comment #5 from Naheem Zaffar <naheemzaffar at gmail.com> ---
I have just tried using an older 3m long HDMI cable I had at home that I
presume cannot support the latest HDMI version and with that I got a display at
full resolution.

The problem may be with HDMI handling, there seem to be others experiencing
some problems with HDMI 2, which I dont think this card supports.

is there a way to confirm the HDMI versions I was using that failed and the
version that succeeded?

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