Same annoying problem AMD APU 9720P RX 540.
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https://bugs.launchpad.net/bugs/1807511
Title:
AMDGPU Radeon RX540 system freezes poor performance with ac adapter
plugged in
To manage
Problem affects Ubuntu 16.04 for me: tested right now.
As @bmhm said, launching application using 'env SWT_GTK3=0 UBUNTU_MENUPROXY=0
/path/to/eclipse' worked.
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