diff --git a/hosts/common/programs/alsa-ucm-conf/default.nix b/hosts/common/programs/alsa-ucm-conf/default.nix
index 5f2bafbbf..10d8f6d63 100644
--- a/hosts/common/programs/alsa-ucm-conf/default.nix
+++ b/hosts/common/programs/alsa-ucm-conf/default.nix
@@ -15,8 +15,9 @@ in
     };
 
     # upstream alsa ships with PinePhone audio configs, but they don't actually produce sound.
-    # - still true as of 2024-05-26
+    # - still true as of 2024-08-20
     # - see: <https://github.com/alsa-project/alsa-ucm-conf/pull/134>
+    # - see: <https://gitlab.com/postmarketOS/pmaports/-/issues/2115>
     #
     # we can substitute working UCM conf in two ways:
     # 1. nixpkgs' override for the `alsa-ucm-conf` package
diff --git a/pkgs/additional/alsa-ucm-pinephone-pmos/default.nix b/pkgs/additional/alsa-ucm-pinephone-pmos/default.nix
index b426ba8a7..0a61a875e 100644
--- a/pkgs/additional/alsa-ucm-pinephone-pmos/default.nix
+++ b/pkgs/additional/alsa-ucm-pinephone-pmos/default.nix
@@ -14,6 +14,7 @@ let
   };
   pmosAdditions = "${pmaports}/device/main/device-pine64-pinephone/ucm";
 in alsa-ucm-conf.overrideAttrs (upstream: {
+  version = upstream.version + "-unstable-pmos-2024-05-26";
   postInstall = (upstream.postInstall or "") + ''
     install -Dm644 -t $out/share/alsa/ucm2/PinePhone \
       ${pmosAdditions}/HiFi.conf \