Problem still exists in 4.16.10 kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16.10/ (#uname -r output is 4.16.10-041610-generic )
dmesg output gives same error output as before when amdgpu.dc=1 [ 1.866312] [drm] amdgpu: 1024M of VRAM memory ready [ 1.866316] [drm] amdgpu: 3072M of GTT memory ready. [ 1.866332] [drm] GART: num cpu pages 262144, num gpu pages 262144 [ 1.866382] [drm] PCIE GART of 1024M enabled (table at 0x000000F400040000). [ 1.866500] [drm] Internal thermal controller without fan control [ 1.866504] [drm] amdgpu: dpm initialized [ 1.867685] [drm] Found UVD firmware Version: 1.55 Family ID: 9 [ 1.868113] [drm] Found VCE firmware Version: 50.10 Binary ID: 2 [ 1.870125] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:3! type 0 expected 3 [ 1.870214] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:4! type 0 expected 3 [ 1.870337] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:5! type 0 expected 3 [ 1.870445] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:6! type 0 expected 3 [ 1.880211] [drm] Display Core initialized with v3.1.27! [ 1.887329] [drm] SADs count is: -2, don't need to read it [ 1.887755] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.887761] [drm] Driver supports precise vblank timestamp query. [ 1.906232] [drm] UVD initialized successfully. -- 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: In Progress Status in linux source package in Bionic: In Progress 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
