Fix frontier silicon EQ Mode not present on all devices (#76200)

* Fix #76159: EQ Mode not present on all devices

* Address review remarks

* Duplicate bookkeeping of sound mode support

* reduce length of try-blocks

homeassistant/components/frontier_silicon/media_player.py

@@ -3,7 +3,12 @@ from __future__ import annotations
 
 import logging
 
-from afsapi import AFSAPI, ConnectionError as FSConnectionError, PlayState
+from afsapi import (
+    AFSAPI,
+    ConnectionError as FSConnectionError,
+    NotImplementedException as FSNotImplementedException,
+    PlayState,
+)
 import voluptuous as vol
 
 from homeassistant.components.media_player import (
@@ -113,10 +118,12 @@ class AFSAPIDevice(MediaPlayerEntity):
         )
         self._attr_name = name
 
-        self._max_volume = None
+        self._max_volume: int | None = None
 
-        self.__modes_by_label = None
-        self.__sound_modes_by_label = None
+        self.__modes_by_label: dict[str, str] | None = None
+        self.__sound_modes_by_label: dict[str, str] | None = None
+
+        self._supports_sound_mode: bool = True
 
     async def async_update(self):
         """Get the latest date and update device state."""
@@ -158,10 +165,18 @@ class AFSAPIDevice(MediaPlayerEntity):
             }
             self._attr_source_list = list(self.__modes_by_label)
 
-        if not self._attr_sound_mode_list:
+        if not self._attr_sound_mode_list and self._supports_sound_mode:
+            try:
+                equalisers = await afsapi.get_equalisers()
+            except FSNotImplementedException:
+                self._supports_sound_mode = False
+                # Remove SELECT_SOUND_MODE from the advertised supported features
+                self._attr_supported_features ^= (
+                    MediaPlayerEntityFeature.SELECT_SOUND_MODE
+                )
+            else:
                 self.__sound_modes_by_label = {
-                sound_mode.label: sound_mode.key
-                for sound_mode in await afsapi.get_equalisers()
+                    sound_mode.label: sound_mode.key for sound_mode in equalisers
                 }
                 self._attr_sound_mode_list = list(self.__sound_modes_by_label)
 
@@ -185,8 +200,19 @@ class AFSAPIDevice(MediaPlayerEntity):
             self._attr_is_volume_muted = await afsapi.get_mute()
             self._attr_media_image_url = await afsapi.get_play_graphic()
 
+            if self._supports_sound_mode:
+                try:
                     eq_preset = await afsapi.get_eq_preset()
-            self._attr_sound_mode = eq_preset.label if eq_preset is not None else None
+                except FSNotImplementedException:
+                    self._supports_sound_mode = False
+                    # Remove SELECT_SOUND_MODE from the advertised supported features
+                    self._attr_supported_features ^= (
+                        MediaPlayerEntityFeature.SELECT_SOUND_MODE
+                    )
+                else:
+                    self._attr_sound_mode = (
+                        eq_preset.label if eq_preset is not None else None
+                    )
 
             volume = await self.fs_device.get_volume()