I'd like to perform a bisect to figure out what commit caused this regression. We need to identify the earliest kernel where the issue started happening as well as the latest kernel that did not have this issue.
Can you test the following kernels and report back? We are looking for the first kernel version that exhibits this bug: v4.14 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14/ v4.15-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/ v4.15-rc5: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc5/ v4.15-rc9: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc9/ v4.15 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15/ v4.16-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc1/ You don't have to test every kernel, just up until the kernel that first has this bug. Thanks in advance! ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: Incomplete => Triaged ** Tags added: kernel-da-key ** Also affects: linux (Ubuntu Bionic) Importance: High Status: Triaged ** Tags added: performing-bisect -- 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/1761751 Title: Black screen on 18.04 + AMD RX460 Status in linux package in Ubuntu: Triaged Status in linux source package in Bionic: Triaged Bug description: I've been running 16.04 + hwe kernel 4.15 for a while now and recently I'm now having a black screen instead. I've also tried an 18.04 daily live USB stick, which has the same issue. It probably started during an upgrade this week or last week. As a start I'm blaming the Linux kernel since booting a 4.13 kernel works just fine. Known faulty kernel versions are: * linux-image-4.15.0-041500-generic (mainline kernel), * linux-image-4.16.0-041600-generic (mainline kernel), * linux-image-4.15.0-13-generic (Ubuntu kernel), * whatever comes with 18.04 daily live USB stick as of 20180404. Not sure how to best collect logs and system information for you since I'm not used to debugging black screens, so I'm just attaching lspci as a start. EDIT: Workaround found by adding "amdgpu.dc=0" to kernel boot parameters. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1761751/+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
