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
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