I'm running Linux Mint Cinnamon 19.3 64-bit on an old desktop (ASUS P7P55D mobo, Core i5 750, 4GB RAM, ancient GeForce 9800GT using nouveau drivers).
Last night I was prompted to upgrade my kernel from 5.0.0-37 to 5.3.0-26, and since then I can't suspend. When I try, the screen goes blank and the monitor powers off, the keyboard (wired, USB) appears to power off, but the PC doesn't power-off and fans keep spinning. At this point, alt-sysreq-REISUB has no effect (that I can see anyway) and I am forced to hold the power-button to force power-off.
I note that there are a few other recent posts (both here, and Ubuntu related posts) regarding suspend/resume using different desktops where Kernel 5.3.0-26 seems to be a common factor, albeit, other people seem to have problems with resume rather than suspend.
NOTE: I have booted using the older, correctly working, kernel... but otherwise everything should be accurate!
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$ inxi -Fxz System: Host: kafka Kernel: 5.0.0-37-generic x86_64 bits: 64 compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.4.8 Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic Machine: Type: Desktop Mobo: ASUSTeK model: P7P55D v: Rev 1.xx serial: <filter> BIOS: American Megatrends v: 2101 date: 10/20/2011 CPU: Topology: Quad Core model: Intel Core i5 750 bits: 64 type: MCP arch: Nehalem rev: 5 L2 cache: 8192 KiB flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 21398 Speed: 1204 MHz min/max: 1200/2668 MHz Core speeds (MHz): 1: 1204 2: 1204 3: 1204 4: 1204 Graphics: Device-1: NVIDIA G92 [GeForce 9800 GT] driver: nouveau v: kernel bus ID: 01:00.0 Display: x11 server: X.Org 1.19.6 driver: nouveau unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz OpenGL: renderer: NV92 v: 3.3 Mesa 19.2.1 direct render: Yes Audio: Device-1: Intel 5 Series/3400 Series High Definition Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 00:1b.0 Sound Server: ALSA v: k5.0.0-37-generic Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK M4A785/P7P55 driver: r8169 v: kernel port: c800 bus ID: 02:00.0 IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter> Drives: Local Storage: total: 1.93 TiB used: 962.57 GiB (48.7%) ID-1: /dev/sda vendor: PNY model: CS900 120GB SSD size: 111.79 GiB temp: 33 C ID-2: /dev/sdb vendor: Western Digital model: WD20EZRZ-00Z5HB0 size: 1.82 TiB temp: 27 C Partition: ID-1: / size: 21.87 GiB used: 15.23 GiB (69.6%) fs: ext4 dev: /dev/sda1 ID-2: /home size: 87.53 GiB used: 8.25 GiB (9.4%) fs: ext4 dev: /dev/sda5 Sensors: System Temperatures: cpu: 36.0 C mobo: N/A gpu: nouveau temp: 42 C Fan Speeds (RPM): N/A Info: Processes: 236 Uptime: 41m Memory: 3.85 GiB used: 1.19 GiB (30.9%) Init: systemd runlevel: 5 Compilers: gcc: 7.4.0 Shell: bash v: 4.4.20 inxi: 3.0.32