diff --git a/hosts/modules/hal/pine64-pinephone-pro/default.nix b/hosts/modules/hal/pine64-pinephone-pro/default.nix
index 766df3685..46d1664a8 100644
--- a/hosts/modules/hal/pine64-pinephone-pro/default.nix
+++ b/hosts/modules/hal/pine64-pinephone-pro/default.nix
@@ -183,7 +183,11 @@ in
     boot.extraModulePackages = [
       config.boot.kernelPackages.rk818-charger  #< rk818 battery/charger isn't mainline as of 2024-10-01
       config.boot.kernelPackages.imx258  #< mainline imx258 camera driver has some power-on issues on PPP  (imx258 1-001a: Error reading reg 0x0016: -6)
-      # config.boot.kernelPackages.rt5640  #< optionally use megi's rt5640 sound driver, but mainline driver seems to mostly play nice with imx258 these days
+      #v optionally use megi's rt5640 sound driver;
+      #v XXX(2025-07-18): mainline driver errors: `rt5640: 1-001c: ASoC error (-22): at snd_soc_dai_set_sysclk() on rt5640-aif1`
+      #v                  prior to this mainline driver was working fine, alongside camera/imx258, for half a year.
+      #v                  although this fixes the dmesg errors, it causes pipewire/wireplumber to crash-loop.
+      config.boot.kernelPackages.rt5640
     ];
 
     # default nixos behavior is to error if a kernel module is provided by more than one package.