NOPE, NEVERMIND. The issue is still happening. I thought I did a full reboot, with [deep], and came back. But I just came back after an hour or two and the BACKLIGHT turned on, but it still wouldn't come back from suspend.
This seems like it attempted to come back online: $ journalctl -o short-precise -k -b -1 Nov 06 06:48:08.615902 sedna kernel: ACPI: EC: EC stopped Nov 06 06:48:08.615935 sedna kernel: PM: Saving platform NVS memory Nov 06 06:48:08.615965 sedna kernel: Disabling non-boot CPUs ... Nov 06 06:48:08.616002 sedna kernel: IRQ 41: no longer affine to CPU1 Nov 06 06:48:08.616039 sedna kernel: IRQ 42: no longer affine to CPU1 Nov 06 06:48:08.616071 sedna kernel: IRQ 43: no longer affine to CPU1 Nov 06 06:48:08.616104 sedna kernel: smpboot: CPU 1 is now offline Nov 06 06:48:08.616136 sedna kernel: ACPI: Low-level resume complete Nov 06 06:48:08.616165 sedna kernel: ACPI: EC: EC started Nov 06 06:48:08.616199 sedna kernel: PM: Restoring platform NVS memory Nov 06 06:48:08.616230 sedna kernel: Enabling non-boot CPUs ... Nov 06 06:48:08.616255 sedna kernel: x86: Booting SMP configuration: Nov 06 06:48:08.616284 sedna kernel: smpboot: Booting Node 0 Processor 1 APIC 0x2 Nov 06 06:48:08.616313 sedna kernel: CPU1 is up Nov 06 06:48:08.616338 sedna kernel: ACPI: Waking up from system sleep state S3 Nov 06 06:48:08.616374 sedna kernel: ACPI: EC: interrupt unblocked Nov 06 06:48:08.616405 sedna kernel: ACPI: EC: event unblocked Nov 06 06:48:08.616435 sedna kernel: sd 0:0:0:0: [sda] Starting disk Nov 06 06:48:08.616612 sedna kernel: elan_i2c i2c-ELAN0000:00: invalid report id data (ff) Nov 06 06:48:08.616821 sedna kernel: usb 1-3: reset high-speed USB device number 2 using xhci_hcd Nov 06 06:48:08.617097 sedna kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Nov 06 06:48:08.617134 sedna kernel: ata1.00: configured for UDMA/133 Nov 06 06:48:08.617164 sedna kernel: OOM killer enabled. Nov 06 06:48:08.617198 sedna kernel: Restarting tasks ... done. Nov 06 06:48:08.617227 sedna kernel: PM: suspend exit Nov 06 06:48:12.073184 sedna kernel: wlp1s0: authenticate with 1c:3b:f3:4c:6b:6f Nov 06 06:48:12.081030 sedna kernel: wlp1s0: send auth to 1c:3b:f3:4c:6b:6f (try 1/3) Nov 06 06:48:12.081106 sedna kernel: wlp1s0: authenticated Nov 06 06:48:12.081155 sedna kernel: wlp1s0: associate with 1c:3b:f3:4c:6b:6f (try 1/3) Nov 06 06:48:12.083802 sedna kernel: wlp1s0: RX AssocResp from 1c:3b:f3:4c:6b:6f (capab=0x1511 status=0 aid=3) Nov 06 06:48:12.089026 sedna kernel: wlp1s0: associated Nov 06 06:48:12.139628 sedna kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlp1s0: link becomes ready [there are no more entries] [then the reboot] $ sudo dmesg Nov 06 06:49:04.835437 sedna kernel: microcode: microcode updated early to revision 0x2f, date = 2019-11-12 Nov 06 06:49:04.835488 sedna kernel: Linux version 5.13.0-20-generic (buildd@lgw01-amd64-013) (gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, GNU ld (GNU Binut> Nov 06 06:49:04.835508 sedna kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.13.0-20-generic root=UUID=afb97784-f7dc-4891-8f9b-f6c22831a037 ro mitig> Nov 06 06:49:04.835521 sedna kernel: KERNEL supported cpus: Nov 06 06:49:04.835533 sedna kernel: Intel GenuineIntel Nov 06 06:49:04.835545 sedna kernel: AMD AuthenticAMD Nov 06 06:49:04.835558 sedna kernel: Hygon HygonGenuine Nov 06 06:49:04.835570 sedna kernel: Centaur CentaurHauls Nov 06 06:49:04.835584 sedna kernel: zhaoxin Shanghai Nov 06 06:49:04.835600 sedna kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' Nov 06 06:49:04.835613 sedna kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' Nov 06 06:49:04.835625 sedna kernel: x86/fpu: Enabled xstate features 0x3, context size is 576 bytes, using 'standard' format. Nov 06 06:49:04.835636 sedna kernel: BIOS-provided physical RAM map: Nov 06 06:49:04.835649 sedna kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable Nov 06 06:49:04.835663 sedna kernel: BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved Nov 06 06:49:04.835678 sedna kernel: BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved [etc] -- 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/1910927 Title: Suspend stopped working since kernel 5.4 (ubuntu 20.04) Status in linux package in Ubuntu: Confirmed Bug description: Suspend was working on ubuntu 18.04 with kernel 4.15.0-128. After upgrade to ubuntu 20.04, suspend is not working. The device is on black screen, fully powered and not responding any longer. I can still boot the old kernel 4.15.0-128 from ubuntu 18.04, suspend is working with this kernel! I tested kernel 5.4.0-60 and 5.8.0-36 from hwe. With both kernels, suspend is broken on my older device with Core2Duo. --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: xubuntu 4020 F.... pulseaudio CasperMD5CheckResult: pass CasperVersion: 1.445 CurrentDesktop: XFCE DistroRelease: Ubuntu 20.04 LiveMediaBuild: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: SAMSUNG ELECTRONICS CO., LTD. R510/P510 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaudrmfb ProcKernelCmdLine: file=/cdrom/preseed/username.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 RelatedPackageVersions: linux-restricted-modules-5.4.0-26-generic N/A linux-backports-modules-5.4.0-26-generic N/A linux-firmware 1.187 Tags: focal Uname: Linux 5.4.0-26-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 04/01/2010 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 10LI.M008.20100401.KSJ dmi.board.name: R510/P510 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr10LI.M008.20100401.KSJ:bd04/01/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR510/P510:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR510/P510:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A: dmi.product.name: R510/P510 dmi.product.version: Not Applicable dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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