The same problem.
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited / Sapphire Technology Tahiti XT [Radeon
HD 7970/8970 OEM / R9 280X]
Kernel driver in use: radeon
Kernel modules: radeon, amdgpu
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https://bugs.launchpad.net/bugs/1724732
Title:
Wayland login options are missing when a radeon card is installed
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