diff --git a/ameba_control_panel/app.py b/ameba_control_panel/app.py
index 67ac83c..334858f 100644
--- a/ameba_control_panel/app.py
+++ b/ameba_control_panel/app.py
@@ -235,7 +235,13 @@ def _setup_logging() -> None:
 def _setup_linux_platform() -> None:
     """Ensure correct Qt platform plugin on Linux."""
     import os
-    if sys.platform != "linux" or os.environ.get("QT_QPA_PLATFORM"):
+    if sys.platform != "linux":
+        return
+    # Disable xdg-desktop-portal and GVfs UDisks2 volume monitor to prevent
+    # file dialog crashes / hangs caused by D-Bus service timeouts.
+    os.environ.setdefault("QT_DISABLE_XDG_DESKTOP_PORTAL", "1")
+    os.environ.setdefault("GIO_USE_VOLUME_MONITOR", "unix")
+    if os.environ.get("QT_QPA_PLATFORM"):
         return
     if os.environ.get("WAYLAND_DISPLAY"):
         os.environ["QT_QPA_PLATFORM"] = "wayland;xcb"
diff --git a/ameba_control_panel/controllers/device_tab_controller.py b/ameba_control_panel/controllers/device_tab_controller.py
index f27a15a..4f72855 100644
--- a/ameba_control_panel/controllers/device_tab_controller.py
+++ b/ameba_control_panel/controllers/device_tab_controller.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+import sys
 from pathlib import Path
 from typing import List, Optional
 
@@ -274,7 +275,13 @@ class DeviceTabController(QObject):
     # Command list playback ----------------------------------------------------
     def _browse_cmdlist(self) -> None:
         from PySide6.QtWidgets import QFileDialog
-        path, _ = QFileDialog.getOpenFileName(self.view, "Command list", "", "Text files (*.txt);;All files (*)")
+        dlg = QFileDialog(self.view, "Command list", "", "Text files (*.txt);;All files (*)")
+        dlg.setFileMode(QFileDialog.FileMode.ExistingFile)
+        if sys.platform == "linux":
+            dlg.setOption(QFileDialog.Option.DontUseNativeDialog, True)
+        if dlg.exec() != QFileDialog.DialogCode.Accepted or not dlg.selectedFiles():
+            return
+        path = dlg.selectedFiles()[0]
         if path:
             self.view.cmdlist_path_edit.setText(path)
             self._save_session()
diff --git a/ameba_control_panel/managers/flash_manager.py b/ameba_control_panel/managers/flash_manager.py
index 5d8ad69..d65ce8d 100644
--- a/ameba_control_panel/managers/flash_manager.py
+++ b/ameba_control_panel/managers/flash_manager.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+import sys
 from pathlib import Path
 from typing import Callable, List, Optional, Tuple, TYPE_CHECKING
 
@@ -54,9 +55,12 @@ class FlashManager:
         self._connected_baud = baud
 
     def browse_file(self, title: str, target: QLineEdit, file_filter: str = "Binary files (*);;All files (*)") -> None:
-        path, _ = QFileDialog.getOpenFileName(self.view, title, "", file_filter)
-        if path:
-            target.setText(path)
+        dlg = QFileDialog(self.view, title, "", file_filter)
+        dlg.setFileMode(QFileDialog.FileMode.ExistingFile)
+        if sys.platform == "linux":
+            dlg.setOption(QFileDialog.Option.DontUseNativeDialog, True)
+        if dlg.exec() == QFileDialog.DialogCode.Accepted and dlg.selectedFiles():
+            target.setText(dlg.selectedFiles()[0])
             self._save_session()
 
     @staticmethod
diff --git a/ameba_control_panel/managers/log_manager.py b/ameba_control_panel/managers/log_manager.py
index 8203f42..82de855 100644
--- a/ameba_control_panel/managers/log_manager.py
+++ b/ameba_control_panel/managers/log_manager.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 from collections import deque
 from pathlib import Path
 from typing import Callable, Deque, List, Optional, Tuple, TYPE_CHECKING
@@ -103,7 +104,13 @@ class LogManager(QObject):
         self.view.log_view.set_matches([], -1)
 
     def save(self) -> None:
-        path, _ = QFileDialog.getSaveFileName(self.view, "Save Log", str(Path.home() / "ameba_log.txt"))
+        dlg = QFileDialog(self.view, "Save Log", str(Path.home() / "ameba_log.txt"))
+        dlg.setAcceptMode(QFileDialog.AcceptMode.AcceptSave)
+        if sys.platform == "linux":
+            dlg.setOption(QFileDialog.Option.DontUseNativeDialog, True)
+        if dlg.exec() != QFileDialog.DialogCode.Accepted or not dlg.selectedFiles():
+            return
+        path = dlg.selectedFiles()[0]
         if not path:
             return
         try:
diff --git a/script/auto_run.py b/script/auto_run.py
index 0624a14..7448329 100644
--- a/script/auto_run.py
+++ b/script/auto_run.py
@@ -13,7 +13,11 @@ def _bootstrap_path() -> None:
 
 def _setup_linux_platform() -> None:
     """Set Qt platform plugin for Linux X11/Wayland compatibility."""
-    if sys.platform != "linux" or os.environ.get("QT_QPA_PLATFORM"):
+    if sys.platform != "linux":
+        return
+    os.environ.setdefault("QT_DISABLE_XDG_DESKTOP_PORTAL", "1")
+    os.environ.setdefault("GIO_USE_VOLUME_MONITOR", "unix")
+    if os.environ.get("QT_QPA_PLATFORM"):
         return
     if os.environ.get("WAYLAND_DISPLAY"):
         os.environ["QT_QPA_PLATFORM"] = "wayland;xcb"