fix: the conversion removes single user mode's desktop autologin, which pinned the Plasma session

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KkpbsMw4rQyBsxDG6ebHK2

CHANGELOG.md

@@ -7,6 +7,8 @@ one per merged pull request.
 
 ## 2.11.2 - 2026-10-13
 
+- **fix: on an NVIDIA PC that had single user mode on before the SteamOS conversion, "Return to Gaming Mode" and the boot choice work again: single user mode's desktop autologin (`zzz-steamify-autologin.conf`, read last) pinned the Plasma session; the conversion removes it, and turning the conversion off sets it up again**
+
 - **fix: when an option fails, its sub-options are not applied any more (a failed conversion used to leave its "Boot into the desktop", silent start and icons on without it)**
 
 - **fix: a PC that keeps `python-hidapi` (liquidctl needs it) can use the SteamOS conversion: jupiter-hw-support, which gamescope-session-cachyos depends on, wants `python-hid`, which conflicts with it and stopped the package install. Steamify builds and installs an empty placeholder package that provides `python-hid` first (`patches/python-hid-shim.PKGBUILD`); only the Steam Deck controller firmware updater uses it**

lib/login-manager.sh

@@ -109,6 +109,8 @@ gaming_enable() {
             install_session_sync
             ;;
     esac
+    # (NVIDIA with single user mode from before the conversion: its desktop autologin would pin the Plasma session.)
+    single_login_release
     create_desktop_shortcut
     steam_enable
     os_name_enable || return 1
@@ -127,6 +129,8 @@ gaming_disable() {
     gsn_disable
     krevert gaming
     os_name_disable
+    # NVIDIA with single user mode still on: nothing else logs in by itself any more.
+    nvidia_present && single_status && single_login_enable
     ok "The PC boots to the normal login screen again (from the next boot)."
 }
 

lib/single-user.sh

@@ -140,6 +140,15 @@ EOF
     remove_sddm_base_autologin
 }
 
+single_login_release() {
+    # The SteamOS conversion logs in by itself, and picks the session (gamescope, or the desktop with "Boot into"): the
+    # desktop autologin above, which sorts last, would pin the Plasma session and "Return to Gaming Mode" would open KDE
+    # again. Called when the conversion is turned on; turning it off sets it up again (gaming_disable).
+    [[ -f "$SINGLE_AUTOLOGIN" ]] || return 0
+    info "The SteamOS conversion logs in by itself: removing the desktop autologin of single user mode."
+    sudo rm -f "$SINGLE_AUTOLOGIN"
+}
+
 single_login_disable() {
     [[ -f "$SINGLE_AUTOLOGIN" ]] || return 0
     sudo rm -f "$SINGLE_AUTOLOGIN"