Add configurable idle frontlight dimming and settings scrollbar to Kobo app

[Copilot]

sKeets had no display-side idle power behavior while running interactively, and the new timeout control also needed to remain reachable in the Kobo Settings UI. This change adds a configurable inactivity timeout that turns off the Kobo frontlight after a period of inactivity, while keeping the implementation scoped to the existing settings/config/event-loop paths and extending Settings with a reusable right-side scrollbar.

• Idle dimming

  • Tracks user activity in the main input loop.
  • Turns off the frontlight after the configured idle interval.
  • Avoids any framebuffer clear or e-ink refresh when the timeout fires.

• Wake behavior

  • Restores the previous frontlight brightness on touch or key input.
  • Wake taps still avoid activating the underlying control on the same gesture.
  • Restores the saved frontlight brightness on app exit as well.

• Settings + persistence

  • Adds a new Settings row for Screen Dim Timeout.
  • Cycles through preset values: Off, 30 sec, 1 min, 5 min, 10 min, 30 min.
  • Persists the timeout in config.ini as screen_dim_timeout_seconds.

• Settings navigation

  • Adds a right-side scrollbar to the Settings screen so lower rows remain reachable.
  • Reuses the existing paginated scrollbar behavior already used elsewhere in the Kobo UI.
  • Keeps the Sign Out action fixed at the bottom while paging the settings rows above it.

• UI updates

  • Adds a compact value-row control in Settings for the timeout.
  • Updates the setting text to explain that the timeout turns off the frontlight until the next input.
  • Updates the Settings hint text to direct users to the right scrollbar for additional rows.

• Docs

  • Updates the feature list and config example to include the new timeout setting and frontlight-off behavior.

• Scope

  • Covers the inactivity-timeout detection, frontlight off/on behavior, and Settings accessibility needed for this control.
  • Does not implement suspend/resume, Wi-Fi teardown/restore, /sys/power/state-extended handling, unexpected wake guards, or sleep-cover handling.

Example persisted config:

screen_dim_timeout_seconds=300

Original prompt

Address the power management GitHub issue, screen should go dim after a configurable time in addition to the improvements.

---

📍 Connect Copilot coding agent with Jira, Azure Boards or Linear to delegate work to Copilot in one click without leaving your project management tool.

[Ashex]

@copilot update #4 to mark what is covered here

[Copilot]

@copilot update #4 to mark what is covered here

Updated the PR tracking to call out that cb6b4a0 covers the inactivity-timeout detection and the frontlight off/on pieces of #4 only; suspend/resume, Wi-Fi handling, state-extended writes, unexpected wake guards, and sleep-cover support are still out of scope here. Screenshot: https://github.com/user-attachments/assets/0a5218af-5c6c-49bd-a537-b154dc358c52

[Ashex]

@copilot is the settings screen scrollable to access the setting

[Copilot]

@copilot is the settings screen scrollable to access the setting

No—the Settings screen is not scrollable right now. It uses a fixed layout, and the new Screen Dim Timeout row is placed directly above the note/sign-out area in that visible layout rather than behind a scroll region. Screenshot: https://github.com/user-attachments/assets/0a5218af-5c6c-49bd-a537-b154dc358c52

[Ashex]

@copilot add a scroll bar, reuse the existing one for feed pagination.

[Copilot]

@copilot add a scroll bar, reuse the existing one for feed pagination.

Done in fbc3c0d. Settings now use a right-side scrollbar with paginated rows above the fixed Sign Out footer, and Screen Dim Timeout is reachable via that scrollbar. Screenshot: https://github.com/user-attachments/assets/0a5218af-5c6c-49bd-a537-b154dc358c52