Hello @CuriousTommy, in your log this looks curious:
***** Event = gamepad discovered
***** GAMEPAD DESCRIPTION: = ASRock LED Controller
Hypothetically, if the game's trying to get controller input from that first, it could be causing your snafu.
Maybe try blacklisting that device with something similar to the discussion at https://bbs.archlinux.org/viewtopic.php?id=261161.
Thanks @kisak-valve! That was indeed the issue.
Sorry for the spam. I'll close this ticket.
proton experimentalx1 2021-09
Compatibility Report
System Information
I confirm:
Symptoms
One out of the four arrow keys will work. Which arrow key works depends on where you are.
Reproduction
steam-1690940_chapter_one_prompt_down_press_works_only.log
steam-1690940_chapter_one_character_selection_screen_left_press_works_only.log
