Hello Manjaro!
My monitor turns off when I play counter strike (usually after about 10 minutes) and I have to reboot computer to get the monitor started again. I run it through manjaro steam, and I have the same problem when running it with steam native. I came from ubuntu and I din’t have any problems there 
OS: Manjaro Linux x86_64
Host: MS-7A31 1.0
Kernel: 5.16.14-1-MANJARO
DE: GNOME 41.4
WM: Mutter
CPU: AMD Ryzen 7 1700X (16) @ 3.400GHz
GPU: AMD ATI Radeon RX 580
Memory: 16006MiB
Here is the journalctl output:
mar 16 19:16:06 Mainframe com.valvesoftware.Steam.desktop[17276]: Installing breakpad exception handler for appid(steam)/version(1646806235)
mar 16 19:18:33 Mainframe /usr/lib/gdm-x-session[1009]: (EE) event16 - USB Keyboard: client bug: event processing lagging behind by 33ms, your system is too slow
mar 16 19:18:48 Mainframe /usr/lib/gdm-x-session[1009]: (EE) event16 - USB Keyboard: client bug: event processing lagging behind by 36ms, your system is too slow
mar 16 19:20:11 Mainframe gnome-shell[1155]: pushModal: invocation of begin_modal failed
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17276]: No cached sticky mapping in DeactivateActionSetLayer.No cached sticky mapping in ActivateActionSetLayer.No cached sticky mapping in DeactivateAc>
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Presenter: Actual swap chain properties:
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Format: VK_FORMAT_B8G8R8A8_UNORM
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Present mode: VK_PRESENT_MODE_IMMEDIATE_KHR
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Buffer size: 1920x1080
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Image count: 3
mar 16 19:20:11 Mainframe com.valvesoftware.Steam.desktop[17932]: info: Exclusive FS: 0
mar 16 19:20:32 Mainframe rtkit-daemon[1269]: Supervising 3 threads of 3 processes of 1 users.
mar 16 19:20:32 Mainframe rtkit-daemon[1269]: Supervising 3 threads of 3 processes of 1 users.
mar 16 19:20:42 Mainframe rtkit-daemon[1269]: Supervising 3 threads of 3 processes of 1 users.
mar 16 19:20:42 Mainframe rtkit-daemon[1269]: Supervising 3 threads of 3 processes of 1 users.
mar 16 19:21:02 Mainframe /usr/lib/gdm-x-session[1009]: (EE) event16 - USB Keyboard: client bug: event processing lagging behind by 25ms, your system is too slow
mar 16 19:22:34 Mainframe /usr/lib/gdm-x-session[1009]: (EE) event16 - USB Keyboard: client bug: event processing lagging behind by 28ms, your system is too slow
mar 16 19:22:51 Mainframe kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for fences timed out!