I booted the 4.17rc1 kernel. In order to see output I connected an old TV to the DVI output, and that output was successfully detected (through an DVI-HDMI adapter, if that matters).
The output of /sys/class/drm/card0-HDMI-A-1 in this case: dpms: Off enabled: disabled modes: (empty) status: disconnected I then tried switching which monitor was connected to which port. Interestingly, in this case both the Dell U2415 and the old TV could show output successfully. // David On 2018-05-02 19:50, Harry Wentland wrote: > Thanks, mind posting the same for the non-working kernel? I'm curious if the > problem is > 1) we don't detect the display > 2) we don't enable the display > 3) we enable the display but wrong > -- 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
