Here's an overview of the system
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bryan@zed:~$ inxi -FxGz
System: Host: zed Kernel: 4.9.0-4-amd64 x86_64 (64 bit gcc: 6.3.0)
Desktop: Cinnamon 3.2.7 (Gtk 3.22.11-1)
Distro: Debian GNU/Linux 9 (stretch)
Machine: Device: desktop Mobo: Gigabyte model: GA-990FXA-UD3 v: x.x
BIOS: Award v: F9 date: 10/22/2012
CPU: Octa core AMD FX-8320E Eight-Core (-MCP-) cache: 16384 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm) bmips: 51542
clock speeds: max: 3200 MHz 1: 1400 MHz 2: 1400 MHz 3: 1800 MHz
4: 1400 MHz 5: 1400 MHz 6: 1800 MHz 7: 1400 MHz 8: 1400 MHz
Graphics: Card: NVIDIA GF119 [GeForce GT 610] bus-ID: 01:00.0
Display Server: X.Org 1.19.2 driver: nvidia
Resolution: 1920x1080@60.00hz
GLX Renderer: GeForce GT 610/PCIe/SSE2
GLX Version: 4.5.0 NVIDIA 375.82 Direct Rendering: Yes
Audio: Card-1 NVIDIA GF119 HDMI Audio Controller
driver: snd_hda_intel bus-ID: 01:00.1
Card-2 Advanced Micro Devices [AMD/ATI] SBx00 Azalia (Intel HDA)
driver: snd_hda_intel bus-ID: 00:14.2
Sound: Advanced Linux Sound Architecture v: k4.9.0-4-amd64
Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 v: 2.3LK-NAPI port: ae00 bus-ID: 05:00.0
IF: enp5s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives: HDD Total Size: 500.1GB (13.6% used)
ID-1: /dev/sda model: ST500DM002 size: 500.1GB
Partition: ID-1: / size: 47G used: 6.0G (14%) fs: ext4 dev: /dev/sda2
ID-2: /home size: 192G used: 52G (29%) fs: ext4 dev: /dev/sda5
ID-3: swap-1 size: 6.14GB used: 0.00GB (0%) fs: swap dev: /dev/sda4
Sensors: System Temperatures: cpu: 26.1C mobo: N/A gpu: 0.0:54C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 209 Uptime: 22:05 Memory: 1097.8/16033.3MB
Init: systemd runlevel: 5 Gcc sys: 6.3.0
Client: Shell (bash 4.4.121) inxi: 2.3.5
When the high usage occurs, top shows xorg to be using 48 to 60 percent of the cpu and cpu temps go from their normal 26c to 50c. even with firefox closed. I'm thinking about downgrading the nvidia driver to 340 to see if that helps but thought I'd see if anyone has any other ideas.
Any suggestions of things to check or try will be greatly appreciated.