This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1840514 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840514/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp