All 5.16, 5.16rt and 5.17rc kernels combo with Mesa Amdgpu and Xorg(xfce), break the 144hz option and only the 60hz one is select-able. Just reverting to 5.15 alone fixes everything.
I have lost faith that we can keep a distro with state of the art updated software. Is LTS distros our only option after all?
Ye of little faith. A pebble in your path causes you to fall? 
Please post your system info as outlined here:
KERNEL 5.15
$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
`2560x1440 59.95 + 154.85*`
1920x1200 59.88
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.95
1280x800 59.81
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
KERNEL 5.16
$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
`2560x1440 59.95*+`
1920x1200 59.88
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.95
1280x800 59.81
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
Is that enough information?
Please post the output of the following as outlined in the tutorial above for providing system info:
inxi --admin --verbosity=7 --filter --width
KERNEL 5.15
$ inxi --admin --verbosity=7 --filter --width
System:
Kernel: 5.15.16-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.15-x86_64
root=UUID=e7710bda-2918-4406-9f2b-914f8372bf23 ro quiet apparmor=1
security=apparmor udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff
Desktop: Xfce 4.16.0 tk: Gtk 3.24.29 info: xfce4-panel wm: xfwm 4.16.1
vt: 7 dm: LightDM 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Desktop Mobo: ASRock model: B450 Gaming-ITX/ac
serial: <superuser required> UEFI: American Megatrends v: P3.40
date: 07/17/2019
Battery:
Message: No system battery data found. Is one present?
Memory:
RAM: total: 7.75 GiB used: 1.77 GiB (22.9%)
RAM Report:
permissions: Unable to run dmidecode. Root privileges required.
CPU:
Info: model: AMD Ryzen 3 2200G with Radeon Vega Graphics bits: 64 type: MCP
arch: Zen family: 0x17 (23) model-id: 0x11 (17) stepping: 0
microcode: 0x8101016
Topology: cpus: 1x cores: 4 smt: <unsupported> cache: L1: 384 KiB
desc: d-4x32 KiB; i-4x64 KiB L2: 2 MiB desc: 4x512 KiB L3: 4 MiB
desc: 1x4 MiB
Speed (MHz): avg: 3655 high: 3689 min/max: 1600/3700 boost: enabled
scaling: driver: acpi-cpufreq governor: schedutil cores: 1: 3564 2: 3685
3: 3689 4: 3684 bogomips: 29557
Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1
bmi2 bpext clflush clflushopt clzero cmov cmp_legacy constant_tsc cpb cpuid
cr8_legacy cx16 cx8 de decodeassists extapic extd_apicid f16c flushbyasid
fma fpu fsgsbase fxsr fxsr_opt ht hw_pstate ibpb irperf lahf_lm lbrv lm
mca mce misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc
nopl npt nrip_save nx osvw overflow_recov pae pat pausefilter pclmulqdq
pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pni popcnt pse
pse36 rapl rdrand rdseed rdtscp rep_good sep sev sev_es sha_ni skinit smap
smca sme smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 succor svm svm_lock
syscall tce topoext tsc tsc_scale v_vmsave_vmload vgif vmcb_clean vme
vmmcall wdt xgetbv1 xsave xsavec xsaveerptr xsaveopt xsaves
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP:
disabled, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
vendor: Sapphire Limited driver: amdgpu v: kernel bus-ID: 01:00.0
chip-ID: 1002:67df class-ID: 0300
Display: x11 server: X.Org 1.21.1.3 compositor: picom v: git-dac85 driver:
loaded: amdgpu,ati unloaded: modesetting alternate: fbdev,vesa
display-ID: :0.0 screens: 1
Screen-1: 0 s-res: 2560x1440 s-dpi: 96 s-size: 677x381mm (26.7x15.0")
s-diag: 777mm (30.6")
Monitor-1: DisplayPort-0 res: 2560x1440 dpi: 109
size: 597x336mm (23.5x13.2") diag: 685mm (27")
OpenGL: renderer: AMD Radeon RX 570 Series (POLARIS10 DRM 3.42.0
5.15.16-1-MANJARO LLVM 13.0.0)
v: 4.6 Mesa 21.3.4 direct render: Yes
Audio:
Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
vendor: Sapphire Limited driver: snd_hda_intel v: kernel bus-ID: 01:00.1
chip-ID: 1002:aaf0 class-ID: 0403
Device-2: AMD Family 17h HD Audio vendor: ASRock driver: snd_hda_intel
v: kernel bus-ID: 0b:00.6 chip-ID: 1022:15e3 class-ID: 0403
Sound Server-1: ALSA v: k5.15.16-1-MANJARO running: yes
Sound Server-2: sndio v: N/A running: no
Sound Server-3: JACK v: 1.9.20 running: no
Sound Server-4: PulseAudio v: 15.0 running: no
Sound Server-5: PipeWire v: 0.3.43 running: yes
Network:
Device-1: Intel Dual Band Wireless-AC 3168NGW [Stone Peak] driver: iwlwifi
v: kernel bus-ID: 08:00.0 chip-ID: 8086:24fb class-ID: 0280
IF: wlp8s0 state: down mac: <filter>
Device-2: Intel I211 Gigabit Network vendor: ASRock driver: igb v: kernel
port: e000 bus-ID: 09:00.0 chip-ID: 8086:1539 class-ID: 0200
IF: enp9s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
IP v4: <filter> type: dynamic noprefixroute scope: global
broadcast: <filter>
IP v6: <filter> type: noprefixroute scope: link
WAN IP: <filter>
Bluetooth:
Device-1: Intel Wireless-AC 3168 Bluetooth type: USB driver: btusb v: 0.8
bus-ID: 1-6:2 chip-ID: 8087:0aa7 class-ID: e001
Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends
Logical:
Message: No logical block device data found.
RAID:
Message: No RAID data found.
Drives:
Local Storage: total: 223.57 GiB used: 177.62 GiB (79.4%)
SMART Message: Required tool smartctl not installed. Check --recommends
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Seagate model: XPG GAMMIX S11
size: 223.57 GiB block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s
lanes: 4 type: SSD serial: <filter> rev: SVN139B temp: 29.9 C scheme: GPT
Message: No optical or floppy data found.
Partition:
ID-1: / raw-size: 223.27 GiB size: 218.77 GiB (97.98%)
used: 177.62 GiB (81.2%) fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2
label: N/A uuid: e7710bda-2918-4406-9f2b-914f8372bf23
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 312 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1 label: N/A
uuid: 4032-1C27
Swap:
Alert: No swap data was found.
Unmounted:
Message: No unmounted partitions found.
USB:
Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 10 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Device-1: 1-6:2 info: Intel Wireless-AC 3168 Bluetooth type: Bluetooth
driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA
chip-ID: 8087:0aa7 class-ID: e001
Device-2: 1-7:3 info: A4Tech USB Device type: Keyboard,Mouse,HID
driver: hid-generic,usbhid interfaces: 3 rev: 1.1 speed: 12 Mb/s
power: 100mA chip-ID: 09da:f6eb class-ID: 0300
Device-3: 1-10:4 info: A4Tech USB Device type: Keyboard,Mouse,HID
driver: hid-generic,usbhid interfaces: 3 rev: 1.1 speed: 12 Mb/s
power: 500mA chip-ID: 09da:fa44 class-ID: 0300
Hub-2: 2-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Hub-3: 3-0:1 info: Hi-speed hub with single TT ports: 4 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Hub-4: 4-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Hub-5: 5-0:1 info: Hi-speed hub with single TT ports: 1 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Hub-6: 6-0:1 info: Super-speed hub ports: 1 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Sensors:
System Temperatures: cpu: N/A mobo: N/A gpu: amdgpu temp: 50.0 C
Fan Speeds (RPM): N/A gpu: amdgpu fan: 173
Info:
Processes: 224 Uptime: 10m wakeups: 0 Init: systemd v: 250 tool: systemctl
Compilers: gcc: 11.1.0 clang: 13.0.0 Packages: 1441 pacman: 1426 lib: 439
flatpak: 8 snap: 7 Shell: Bash v: 5.1.16 running-in: xfce4-terminal
inxi: 3.3.12
KERNEL 5.16
$ inxi --admin --verbosity=7 --filter --width
System:
Kernel: 5.16.2-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.16-x86_64
root=UUID=e7710bda-2918-4406-9f2b-914f8372bf23 ro quiet apparmor=1
security=apparmor udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff
Desktop: Xfce 4.16.0 tk: Gtk 3.24.29 info: xfce4-panel wm: xfwm 4.16.1
vt: 7 dm: LightDM 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Desktop Mobo: ASRock model: B450 Gaming-ITX/ac
serial: <superuser required> UEFI: American Megatrends v: P3.40
date: 07/17/2019
Battery:
Message: No system battery data found. Is one present?
Memory:
RAM: total: 7.75 GiB used: 1.15 GiB (14.8%)
RAM Report:
permissions: Unable to run dmidecode. Root privileges required.
CPU:
Info: model: AMD Ryzen 3 2200G with Radeon Vega Graphics bits: 64 type: MCP
arch: Zen family: 0x17 (23) model-id: 0x11 (17) stepping: 0
microcode: 0x8101016
Topology: cpus: 1x cores: 4 smt: <unsupported> cache: L1: 384 KiB
desc: d-4x32 KiB; i-4x64 KiB L2: 2 MiB desc: 4x512 KiB L3: 4 MiB
desc: 1x4 MiB
Speed (MHz): avg: 3674 high: 3698 min/max: 1600/3700 boost: enabled
scaling: driver: acpi-cpufreq governor: schedutil cores: 1: 3612 2: 3698
3: 3693 4: 3694 bogomips: 29559
Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1
bmi2 bpext clflush clflushopt clzero cmov cmp_legacy constant_tsc cpb cpuid
cr8_legacy cx16 cx8 de decodeassists extapic extd_apicid f16c flushbyasid
fma fpu fsgsbase fxsr fxsr_opt ht hw_pstate ibpb irperf lahf_lm lbrv lm
mca mce misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc
nopl npt nrip_save nx osvw overflow_recov pae pat pausefilter pclmulqdq
pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pni popcnt pse
pse36 rapl rdrand rdseed rdtscp rep_good sep sev sev_es sha_ni skinit smap
smca sme smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 succor svm svm_lock
syscall tce topoext tsc tsc_scale v_vmsave_vmload vgif vmcb_clean vme
vmmcall wdt xgetbv1 xsave xsavec xsaveerptr xsaveopt xsaves
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP:
disabled, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
vendor: Sapphire Limited driver: amdgpu v: kernel bus-ID: 01:00.0
chip-ID: 1002:67df class-ID: 0300
Display: x11 server: X.Org 1.21.1.3 compositor: picom v: git-dac85 driver:
loaded: amdgpu,ati unloaded: modesetting alternate: fbdev,vesa
display-ID: :0.0 screens: 1
Screen-1: 0 s-res: 2560x1440 s-dpi: 96 s-size: 677x381mm (26.7x15.0")
s-diag: 777mm (30.6")
Monitor-1: DisplayPort-0 res: 2560x1440 hz: 60 dpi: 109
size: 597x336mm (23.5x13.2") diag: 685mm (27")
OpenGL: renderer: AMD Radeon RX 570 Series (POLARIS10 DRM 3.44.0
5.16.2-1-MANJARO LLVM 13.0.0)
v: 4.6 Mesa 21.3.4 direct render: Yes
Audio:
Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
vendor: Sapphire Limited driver: snd_hda_intel v: kernel bus-ID: 01:00.1
chip-ID: 1002:aaf0 class-ID: 0403
Device-2: AMD Family 17h HD Audio vendor: ASRock driver: snd_hda_intel
v: kernel bus-ID: 0b:00.6 chip-ID: 1022:15e3 class-ID: 0403
Sound Server-1: ALSA v: k5.16.2-1-MANJARO running: yes
Sound Server-2: sndio v: N/A running: no
Sound Server-3: JACK v: 1.9.20 running: no
Sound Server-4: PulseAudio v: 15.0 running: no
Sound Server-5: PipeWire v: 0.3.43 running: yes
Network:
Device-1: Intel Dual Band Wireless-AC 3168NGW [Stone Peak] driver: iwlwifi
v: kernel bus-ID: 08:00.0 chip-ID: 8086:24fb class-ID: 0280
IF: wlp8s0 state: down mac: <filter>
Device-2: Intel I211 Gigabit Network vendor: ASRock driver: igb v: kernel
port: e000 bus-ID: 09:00.0 chip-ID: 8086:1539 class-ID: 0200
IF: enp9s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
IP v4: <filter> type: dynamic noprefixroute scope: global
broadcast: <filter>
IP v6: <filter> type: noprefixroute scope: link
WAN IP: <filter>
Bluetooth:
Device-1: Intel Wireless-AC 3168 Bluetooth type: USB driver: btusb v: 0.8
bus-ID: 1-6:2 chip-ID: 8087:0aa7 class-ID: e001
Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends
Logical:
Message: No logical block device data found.
RAID:
Message: No RAID data found.
Drives:
Local Storage: total: 223.57 GiB used: 177.81 GiB (79.5%)
SMART Message: Required tool smartctl not installed. Check --recommends
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Seagate model: XPG GAMMIX S11
size: 223.57 GiB block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s
lanes: 4 type: SSD serial: <filter> rev: SVN139B temp: 33.9 C scheme: GPT
Message: No optical or floppy data found.
Partition:
ID-1: / raw-size: 223.27 GiB size: 218.77 GiB (97.98%)
used: 177.81 GiB (81.3%) fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2
label: N/A uuid: e7710bda-2918-4406-9f2b-914f8372bf23
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 312 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1 label: N/A
uuid: 4032-1C27
Swap:
Alert: No swap data was found.
Unmounted:
Message: No unmounted partitions found.
USB:
Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 10 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Device-1: 1-6:2 info: Intel Wireless-AC 3168 Bluetooth type: Bluetooth
driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA
chip-ID: 8087:0aa7 class-ID: e001
Device-2: 1-7:3 info: A4Tech USB Device type: Keyboard,Mouse,HID
driver: hid-generic,usbhid interfaces: 3 rev: 1.1 speed: 12 Mb/s
power: 100mA chip-ID: 09da:f6eb class-ID: 0300
Device-3: 1-10:4 info: A4Tech USB Device type: Keyboard,Mouse,HID
driver: hid-generic,usbhid interfaces: 3 rev: 1.1 speed: 12 Mb/s
power: 500mA chip-ID: 09da:fa44 class-ID: 0300
Hub-2: 2-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Hub-3: 3-0:1 info: Hi-speed hub with single TT ports: 4 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Hub-4: 4-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Hub-5: 5-0:1 info: Hi-speed hub with single TT ports: 1 rev: 2.0
speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
Hub-6: 6-0:1 info: Super-speed hub ports: 1 rev: 3.1 speed: 10 Gb/s
chip-ID: 1d6b:0003 class-ID: 0900
Sensors:
System Temperatures: cpu: N/A mobo: N/A gpu: amdgpu temp: 42.0 C
Fan Speeds (RPM): N/A gpu: amdgpu fan: 130
Info:
Processes: 243 Uptime: 0m wakeups: 0 Init: systemd v: 250 tool: systemctl
Compilers: gcc: 11.1.0 clang: 13.0.0 Packages: 1442 pacman: 1427 lib: 439
flatpak: 8 snap: 7 Shell: Bash v: 5.1.16 running-in: xfce4-terminal
inxi: 3.3.12
I would stick with 5.15 for now and try 5.16 later as it matures.
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I’ve done it for you this time. 
It seems not only 120Hz/144Hz option is broken. The new kernels broke 4K with some configurations as well.
My Radeon Pro WX5100 can reach 4K (3840x2160) @ 120Hz with my ASUS XG27UQR when using 5.15 kernel, but with 5.16 kernel and onwards, the maximum resolution I could set is 2560x1440 @ 60Hz.
EDIT: To be precise, with 5.16/5.17rc kernels, higher resolutions and refresh rates are simply not available in the Display settings and the system automatically defaults to the maximum possible resolution. I’m using Cinnamon, though, as it is a bit more HiDPI-friendly than Xfce.
At first I thought there might be an issue with my DP connection but turned out it’s not the case. Returning to 5.15 kernel and I could use 4K @ 120Hz again with no issues.
I think the issue might be related to this bisected regression.
5.18 Fixed the issue. From what i can i understand flashes was appearing on some Amd gpus and someone (not related with Manjaro) kernel developer id…iot decided to blacklist the entire high Hz spectrum. I will say this again, if there is no cleansing to our fields then Linux will never become mainstream. Remember heart-bleed.