Collecting and Sharing Evidence

Collecting and sharing evidence

The best report preserves the failure state, the event timeline, and enough system context to reproduce the problem without exposing personal data.

Capture order

When the Deck is stable enough to use a terminal or SSH:

1. Record the local time and what is physically visible/audible.
2. Note Game Mode/Desktop Mode, dock state, power state, and the last transition (wake, launch, update, overlay, dock/undock).
3. Run sudo ./deckdoc.sh before restarting.
4. Save Steam's built-in System Report when available: Settings -> System -> Advanced -> System Report -> Create Report.
5. Photograph or record a physical-only symptom when software capture differs from the panel.
6. Copy the timestamped master report somewhere safe before experiments.

For a physically black LCD where the system remains alive:

sudo ./deckdoc.sh --display-black

Useful manual context

# Versions and kernel
cat /etc/os-release
uname -a

# Available boot journals
journalctl --list-boots

# Current and previous boot kernel logs
sudo journalctl -k -b 0 --no-pager
sudo journalctl -k -b -1 --no-pager

# Crash index; do not upload core files blindly
coredumpctl list --no-pager

Valve's SteamOS wiki identifies /tmp/dumps/ and steam_stdout.txt as useful Steam-client evidence. DeckDoc counts only actual minidump/core filename classes; normal bookkeeping files in that directory are not crashes.

If the optional continuous probe captured the incident, preserve its whole incident directory before rebooting or purging. A normal sudo ./deckdoc.sh includes the latest incident, but an older incident may provide the comparison that matters.

Public-safe collection contract

DeckDoc runs all full-report, remediation, continuous-probe, and Rescue text through the same public-safe filter before writing it to persistent storage. It deliberately retains no raw report variant. The capability JSON is built from an explicit allowlist rather than a dump.

The filter removes or pseudonymizes credential-bearing lines, private/secret keys, authorization and cookie data, SSIDs/BSSIDs, serial and machine IDs, hostname, email, MAC/IP addresses, Steam account IDs, UUIDs, URLs, and user/removable/temp paths. Collection modules also minimize source data: they count core and Steam artifacts rather than retaining arbitrary filenames or process inventories, and they omit mount labels and mount points.

“Public-safe” is a collection invariant, not permission to upload blindly. An upstream component can introduce a new identifier format, and diagnostic timestamps or software names may still be sensitive to a particular user. Review before posting:

rg -n -i 'password|token|cookie|ssid|bssid|serial|hostname|/home/|/var/home/|ipv4|ipv6|mac' \
  logs/deckdoc_master_report_*.log

Never publish passwords, API tokens, session cookies, Steam Guard codes, SSH private keys, browser profiles, complete environment dumps, or raw core dumps without understanding their contents. A core dump can contain process memory and secrets; DeckDoc never collects raw core contents.

If a future DeckDoc output exposes one of these values, treat it as a security/privacy bug and do not share that artifact. The regression suite seeds fake secrets and identifiers to prevent known classes from returning.

A useful bug report

Include:

• one-sentence symptom and expected behavior;
• device model (LCD/OLED and storage involved);
• SteamOS/client version and update channel;
• exact reproduction steps and frequency;
• Game/Desktop Mode, dock/power/sleep context;
• incident timestamp and whether logs are current- or previous-boot;
• minimal relevant DeckDoc sections;
• what changed recently;
• one-at-a-time tests and their outcomes;
• whether third-party plugins/modifications were disabled for a control run.

Do not upload a huge report without pointing maintainers to the relevant timestamps and signatures.

Preserve evidence through reboot

A forced restart can erase volatile state, but persistent journals and Steam's System Report may still contain current/previous boot data. After reboot, record that the report is post-reboot and do not claim that current sysfs state represents the failed state.

References

• Valve SteamOS: Reviewing log information
• systemd journalctl manual
• systemd coredumpctl manual