Comment # 1 on bug 107953 from Nick Tenney

Realized I forgot to include some important info for the initial report:

Card: Sapphire Nitro RX 580 4 GB
Monitor: Monoprice 35 3440x1440@100 Hz via DP 1.2 connection
Distro: Arch Linux testing repositories, up to date
Mesa: up-to-date git, can look up HEAD if needed