Hello @GoTeamAnt, this is an intentional change in the 1.0.0.62 steam packaging related to #6901.
My understanding was that there wasn't interest in unconditionally logging stdout anymore. You can create an equivalent log by completely closing Steam, then running steam 2>&1 | tee /path/to/logfile from a terminal (or creating a shortcut).
Yes, this was an intentional change. If a game or Steam itself produces a lot of output (perhaps due to a bug), we don't want to fill /tmp, particularly if nobody is going to be reading the result.
If you are going to be reading the result, please use any of the standard Unix/Linux mechanisms that you'd use with any other program (shell redirection, pipe to tee(1), logger(1), systemd-cat(1), ...) to redirect stdout and/or stderr wherever you want it to go.
Closing because this is the intended behavior.
Nothing extracted yet.
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Please describe your issue in as much detail as possible:
Steam stopped logging stdout to /tmp/dumps/$USER_stdout.log