HI,
After suspend, I have some things strange with the wallpaper, see image I can't explain in english, and in french too 🤣 , it's like big pixels overlay...

It's on a HP pavillion, Budgie up to date + nvidia driver installed.

System:
  Host: solus-maryse Kernel: 5.0.7-114.current x86_64 bits: 64 
  Desktop: Budgie 10.5 Distro: Solus 4.0 
Machine:
  Type: Desktop System: HP-Pavilion product: FR583AA-ABF a6573.fr v: N/A 
  serial: <filter> 
  Mobo: MSI model: Boston v: 1.0 serial: <filter> BIOS: Phoenix v: 5.10 
  date: 06/11/2008 
CPU:
  Topology: Dual Core model: Intel Pentium Dual E2200 bits: 64 type: MCP 
  L2 cache: 1024 KiB 
  Speed: 1197 MHz min/max: 1200/2200 MHz Core speeds (MHz): 1: 1197 2: 1197 
Graphics:
  Device-1: NVIDIA G98 [GeForce 9300 GE] driver: nvidia v: 340.107 
  Display: x11 server: X.Org 1.20.3 driver: nvidia 
  resolution: 1680x1050~60Hz 
  OpenGL: renderer: GeForce 9300 GE/PCIe/SSE2 v: 3.3.0 NVIDIA 340.107 
Audio:
  Device-1: Intel NM10/ICH7 Family High Definition Audio 
  driver: snd_hda_intel 
  Sound Server: ALSA v: k5.0.7-114.current 
Network:
  Device-1: Realtek RTL810xE PCI Express Fast Ethernet driver: r8169 
  IF: enp2s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
Drives:
  Local Storage: total: 603.79 GiB used: 27.39 GiB (4.5%) 
  ID-1: /dev/sda vendor: Western Digital model: WD6400AAKS-65A7B0 
  size: 596.17 GiB 
  ID-2: /dev/sdf type: USB model: USB Flash size: 7.62 GiB 
Partition:
  ID-1: / size: 582.15 GiB used: 20.75 GiB (3.6%) fs: ext4 dev: /dev/sda2 
  ID-2: swap-1 size: 3.73 GiB used: 16.2 MiB (0.4%) fs: swap dev: /dev/sda1 
Sensors:
  System Temperatures: cpu: 37.0 C mobo: N/A gpu: nvidia temp: 59 C 
  Fan Speeds (RPM): N/A gpu: nvidia fan: 30% 
Info:
  Processes: 176 Uptime: 3d 22h 56m Memory: 2.93 GiB used: 1.29 GiB (43.9%) 
  Shell: bash inxi: 3.0.32

Does someone knows what happens here?
Thank you.

So after you woke it up, it just went to some bizarre pixelated rendering? And all subsequent different wallpapers you tried look the same big pixels? And you re-booted? And checked eopkg integrity? Double-checked settings and monitor profile?
That's all I got. The sudden-ness of the low resolution means ??? I don't know. Something broke.

Not a lecture: around the XP era I swithced all power saving to NEVER, shut off the monitor by hand if running an errand, and never had a wake-up headache again. Breaking suspend was always drama (problems) for me.

Good luck. I hope we learn what caused the sudden change.

I'm going to point directly at Nvidia's dodgy Linux drivers - almost certainly they're to blame.
Do you have a particular need for them? Are you gaming?
If not you may get better mileage from open source drivers.

Thank you @brent and @normnod , so I did remove nvidia drivers then reboot and the issue seems to disappeared.
It's not my computer, I've install Budgie on this old M$ Vista HP of a friend just for internet, text, printer... and spread the Budgie! 😁
Solved! Thanks.