I had been testing some things on a post 6.6-rc5 kernel for a week or two and then when I pulled to a post 6.6 release kernel, I found that system suspend was broken. It seems that the radeon driver failed to suspend, leaving the display dead, the wayland display server hung, and the system still running. I have been trying to bisect it for the last few days and have only been able to narrow it down to the following 3 commits: There are only 'skip'ped commits left to test. The first bad commit could be any of: 56e449603f0ac580700621a356d35d5716a62ce5 c07bf1636f0005f9eb7956404490672286ea59d3 b70438004a14f4d0f9890b3297cd66248728546c We cannot bisect more! It appears that there was a late merge in the 6.6 window that originally forked from the -rc2, as many of the later commits that I bisected had that version number. I couldn't get it more narrowed down because I had to skip the surrounding commits because they wouldn't even boot up to a gui desktop, let alone try to suspend. When system suspend fails, I find the following in my syslog after I have to magic-sysrq reboot because the the display is dead: Nov 11 18:44:39 faldara kernel: PM: suspend entry (deep) Nov 11 18:44:39 faldara kernel: Filesystems sync: 0.035 seconds Nov 11 18:44:40 faldara kernel: Freezing user space processes Nov 11 18:44:40 faldara kernel: Freezing user space processes completed (elapsed 0.001 seconds) Nov 11 18:44:40 faldara kernel: OOM killer disabled. Nov 11 18:44:40 faldara kernel: Freezing remaining freezable tasks Nov 11 18:44:40 faldara kernel: Freezing remaining freezable tasks completed (elapsed 0.001 seconds) Nov 11 18:44:40 faldara kernel: printk: Suspending console(s) (use no_console_suspend to debug) Nov 11 18:44:40 faldara kernel: serial 00:01: disabled Nov 11 18:44:40 faldara kernel: e1000e: EEE TX LPI TIMER: 00000011 Nov 11 18:44:40 faldara kernel: sd 4:0:0:0: [sdb] Synchronizing SCSI cache Nov 11 18:44:40 faldara kernel: sd 1:0:0:0: [sda] Synchronizing SCSI cache Nov 11 18:44:40 faldara kernel: sd 5:0:0:0: [sdc] Synchronizing SCSI cache Nov 11 18:44:40 faldara kernel: sd 4:0:0:0: [sdb] Stopping disk Nov 11 18:44:40 faldara kernel: sd 1:0:0:0: [sda] Stopping disk Nov 11 18:44:40 faldara kernel: sd 5:0:0:0: [sdc] Stopping disk Nov 11 18:44:40 faldara kernel: amdgpu: Move buffer fallback to memcpy unavailable Nov 11 18:44:40 faldara kernel: [TTM] Buffer eviction failed Nov 11 18:44:40 faldara kernel: [drm] evicting device resources failed Nov 11 18:44:40 faldara kernel: amdgpu 0000:03:00.0: PM: pci_pm_suspend(): amdgpu_pmops_suspend+0x0/0x80 [amdgpu] returns -19 Nov 11 18:44:40 faldara kernel: amdgpu 0000:03:00.0: PM: dpm_run_callback(): pci_pm_suspend+0x0/0x170 returns -19 Nov 11 18:44:40 faldara kernel: amdgpu 0000:03:00.0: PM: failed to suspend async: error -19 Nov 11 18:44:40 faldara kernel: PM: Some devices failed to suspend, or early wake event detected Nov 11 18:44:40 faldara kernel: xhci_hcd 0000:06:00.0: xHC error in resume, USBSTS 0x401, Reinit Nov 11 18:44:40 faldara kernel: usb usb3: root hub lost power or was reset Nov 11 18:44:40 faldara kernel: usb usb4: root hub lost power or was reset Nov 11 18:44:40 faldara kernel: serial 00:01: activated Nov 11 18:44:40 faldara kernel: nvme nvme0: 4/0/0 default/read/poll queues Nov 11 18:44:40 faldara kernel: ata8: SATA link down (SStatus 0 SControl 300) Nov 11 18:44:40 faldara kernel: ata7: SATA link down (SStatus 0 SControl 300) Nov 11 18:44:40 faldara kernel: ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Nov 11 18:44:40 faldara kernel: ata1: SATA link down (SStatus 4 SControl 300) Nov 11 18:44:40 faldara kernel: ata3: SATA link down (SStatus 4 SControl 300) Nov 11 18:44:40 faldara kernel: ata4.00: configured for UDMA/133 Nov 11 18:44:40 faldara kernel: OOM killer enabled. Nov 11 18:44:40 faldara kernel: Restarting tasks ... done. Nov 11 18:44:40 faldara kernel: random: crng reseeded on system resumption Nov 11 18:44:40 faldara kernel: PM: suspend exit Nov 11 18:44:40 faldara kernel: PM: suspend entry (s2idle) Nov 11 18:44:40 faldara systemd-networkd[384]: enp0s31f6: Gained IPv6LL Nov 11 18:44:40 faldara avahi-daemon[668]: Joining mDNS multicast group on interface enp0s31f6.IPv6 with address fe80::3ad5:47ff:fe0f:488a. My video card is this: 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 23 (rev c7) (prog-if 00 [VGA controller]) Subsystem: Gigabyte Technology Co., Ltd Navi 23 Flags: bus master, fast devsel, latency 0, IRQ 139 Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f0000000 (64-bit, prefetchable) [size=2M] I/O ports at e000 [size=256] Memory at f7900000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [64] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Capabilities: [200] Physical Resizable BAR Capabilities: [240] Power Budgeting <?> Capabilities: [270] Secondary PCI Express Capabilities: [2a0] Access Control Services Capabilities: [2d0] Process Address Space ID (PASID) Capabilities: [320] Latency Tolerance Reporting Capabilities: [410] Physical Layer 16.0 GT/s <?> Capabilities: [440] Lane Margining at the Receiver <?> Kernel driver in use: amdgpu Kernel modules: amdgpu