FWIW I've attached /var/log/Xorg.0.* from a -160 versus a -157 boot, on my Ryzen 9 + 6700XT (Navi GPU) system.
The -160 Xorg log contains the following errors warnings: (EE) AMDGPU(0): failed to set mode: Invalid argument (WW) AMDGPU(0): Failed to set mode on CRTC 0 (EE) AMDGPU(0): Failed to enable any CRTC which do not appear in the -157 Xorg log. I'm assuming the above indicates trouble but no idea how to analyze the issue further as I don't know what Xorg display was expecting from the amdgpu GPU driver. (Anyhow as the commit linked to amdgpu has been provided above and looks to be in the right spot, I guess if I could build a custom kernel I would do so with that commit backed out and try booting again.) As I gather some others have done here, I attempted to compare dmesg outputs from -157 boot versus -160 (I used dmesg | grep -i -e amdgpu -e vga > ~/5p15.0-160_dmesg.log to capture the output during a "blackscreen" boot of -160 kernel) but didn't see any console output difference in the -160 dmesg output. The only difference I could spot was the -160 kernel loads amdgpu driver about 1 full second earlier than the -157 kernel. I spot-checked over 3 boots but that's probably not statistically significant sample to really check for an underlying race condition making trouble. anyways if apport-collect or another test would further this cause, please let me know. I'm looking forward to the next kernel bump past this issue. thanks! ** Attachment added: "Xorg log from 5.15.0-160 "blackscreen" boot" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2128729/+attachment/5919886/+files/Xorg.0.log-5.15.0-160 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2128729 Title: Kernel 5.15.0-160 boots without any video output (on AMD) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2128729/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
