https://bugs.freedesktop.org/show_bug.cgi?id=107978
--- Comment #18 from Robin account-freedesktop@tripp.xyz --- Same problem for me. Using 2 identical DELL U2415 and a Radeon RX 580. On Arch with 4.18.x Daisychainig both monitors worked like a charm. After upgrading to 4.19 the monitors only work when I`m disableing DP1.2. But then I obviously can't Daisychain. Is there any way I can help troubleshoot this?