I'm not sure if you asked for the contents of these files from a working or non-working kernel, but I'll take the working kernel since that's obviously a lot easier.
The monitor, Dell U2415, is connected via its input source "HDMI (MHL) 2". The monitor name "DELL U2415" shows up in the edid file. status: connected enabled: enabled dpms: On modes: 1920x1200 1920x1080 1920x1080 1920x1080i 1920x1080i 1920x1080 1920x1080i 1920x1080 1920x1080 1920x1080 1920x1080 1920x1080 1600x1200 1280x1024 1280x1024 1152x864 1280x720 1280x720 1280x720 1024x768 1024x768 800x600 800x600 720x576 720x576i 720x480 720x480 720x480i 720x480i 640x480 640x480 640x480 720x400 // David On 2018-05-02 16:11, Harry Wentland wrote: > Is it HDMI from the board to HDMI on the monitor? I'd like to rule out > any use of an adapter or HDMI-to-DVI cable. > > What monitor is this? > > Is the monitor detected? > > What do you see in the 'status', 'enabled', 'dpms', and 'modes' files in > /sys/class/drm/card0-HDMI-A-1/ ? > -- 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
