Comment # 10
on bug 104412
from S.H.
(In reply to Peter Weber from comment #8) > Hello! > > I'm using a LG 27UD88-W, which featurese 1 x DP, 1 x USB-C (DP) and 2 x > HDMI. In my desktop is a Radeon RX 560 which offers DP "1.4" and HDMI "2.0b" > and I also use a ThinkPad X220 which offers DP "1.1". > > USB-C -> No hardware available > DP -> Reserved for ThinkPad, so I can use 3480x2180@30 Hz (probably even > 44 Hz [1]) > HDMI -> RX 560 > > The DP of the RX 560 works fine at 3480x2180@60Hz, but via HDMI it fails > with Fedora 27 and kernel "3.14". Only 1920x1***@30Hz is possible any higher > resolution results in visual garbage on the screen or "NO SIGNAL". Finally I > remembered, that kernel 3.15 will over the new graphics stack "AMDGPU DC". I > booted a live ISO with kernel 3.15 and passed the requried option > "amdgpu.dc=1" and got 3480x2180@30Hz. GNOME also offers 60Hz as option, but > that fails and cannot be used, screen goes blank, until GNOME reverts the > settings. I'm afraid the previous people are right, HDMI2.0b and 4K@60Hz are > broken. > > > > > HINT: Don't used "DEEP COLOR" (LG OPTION for 8/10BIT COLOR?) with HDMI or > everything is busted, but that is a minor issue, as for now. > > > > > > > > > > > > > > > [1] > https://medium.com/@ValdikSS/how-to-use-high-resolutions-with-older-hardware- > 58577d91b1f8 You need at least Kernel-4.15 which is in rc-state at the moment. Afaik, Kernel 3.14 is way too old for amdgpu and amdgpu-dc.
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