Comment # 18 on bug 107978 from Robin

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?