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I just got a GPU hang while connected to HDMI immediately after running xfce4-display-settings. Here is the hang log: hang.txt. Here is info on my system:

[root@sultan-box ~]# inxi -Fzm
System:    Host: sultan-box Kernel: 5.3.13-arch1-1 x86_64 bits: 64 Desktop: Xfce 4.14.1 Distro: Arch Linux 
Machine:   Type: Laptop System: Dell product: XPS 15 9570 v: N/A serial: <filter> 
           Mobo: Dell model: 02MJVY v: A00 serial: <filter> UEFI: Dell v: 1.13.0 date: 08/22/2019 
Battery:   ID-1: BAT0 charge: 58.9 Wh condition: 80.9/97.0 Wh (83%) 
Memory:    RAM: total: 15.41 GiB used: 993.7 MiB (6.3%) 
           Array-1: capacity: 32 GiB slots: 2 EC: None 
           Device-1: DIMM A size: 8 GiB speed: 2667 MT/s 
           Device-2: DIMM B size: 8 GiB speed: 2667 MT/s 
CPU:       Topology: 6-Core model: Intel Core i7-8750H bits: 64 type: MT MCP L2 cache: 9216 KiB 
           Speed: 800 MHz min/max: 800/4100 MHz Core speeds (MHz): 1: 800 2: 800 3: 801 4: 800 5: 800 6: 800 7: 800 8: 800 
           9: 800 10: 800 11: 800 12: 800 
Graphics:  Device-1: Intel UHD Graphics 630 driver: i915 v: kernel 
           Display: server: X.Org 1.20.6 driver: intel resolution: 1920x1080~60Hz, 3840x2160~30Hz 
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 630 (Coffeelake 3x8 GT2) v: 4.5 Mesa 19.2.6 
Audio:     Device-1: Intel Cannon Lake PCH cAVS driver: snd_hda_intel 
           Sound Server: ALSA v: k5.3.13-arch1-1 
Network:   Device-1: Intel Wi-Fi 6 AX200 driver: iwlwifi 
           IF: wlp59s0 state: up mac: <filter> 
Drives:    Local Storage: total: 931.51 GiB used: 208.65 GiB (22.4%) 
           ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 970 EVO Plus 1TB size: 931.51 GiB 
Partition: ID-1: / size: 456.96 GiB used: 208.52 GiB (45.6%) fs: ext4 dev: /dev/dm-0 
           ID-2: /boot size: 238.1 MiB used: 66.3 MiB (27.8%) fs: ext4 dev: /dev/nvme0n1p2 
Sensors:   System Temperatures: cpu: 33.0 C mobo: N/A 
           Fan Speeds (RPM): cpu: 0 fan-2: 0 
Info:      Processes: 265 Uptime: 2h 12m Shell: bash inxi: 3.0.37