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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1840514
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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1840514
Title:
amdgpu on RX 460 in 18.04.3 does not change state
Status in linux package in Ubuntu:
Incomplete
Bug description:
Upgrading from 18.04 to 18.04.3 on a Mac Pro 5,1, the Polaris 11 AMD
card, RX 460 began being very slow to display gdm3; screens would come
on black then go back to sleep in a cycle. Logging into Gnome takes
anywhere between 60 and 90 seconds. If the screen is allowed to go
black from inactivity, it takes a long time to return to usability.
From experimenting, setting dpm=0 in the grub boot options makes this
particular problem go away at the cost of extremely poor 3D
performance. 3D performance was already much weaker than it should
have be.
I have tried the newest mainline kernel and it there is no difference.
I also have an AMD Firepro W5100 which is a Polaris 10 card. It
operates perfectly. Even before this particular problem, the W5100
out performed the RX 460 which should not be the case.
The RX 460 was tested in a spare Windows 10 computer and works fine.
It was also tested in each of the PCIex16 slots of the Mac Pro 5,1.
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