みーのLG gram (13Z980-MR33J) にUbuntuベースのelementary OS をインストールしたのですが，起動時に時々謎のビープ音を出すようになりました．
5回に1回ぐらいの再現性なので，検証が難しかったのですが，いくつか同様の報告がありました．
Bug #1763994 “LG Gram sound issues after rebooting Ubuntu” : Bugs : Ubuntu
Have been using for a couple of days only with W10 that came installed by default. Today I've installed Linux Mint 19.1 and just after installing from live USB, the first reboot started making strange noise.
LG Gram and BIOS beep : linuxhardware
I recently bought the new LG Gram, installed ArchLinux, it worked from the beginning, the only weird thing that is happening is when the laptop is plugged it makes a continuous loud beep during boot up. Have someone had this error before?
Biosのsecure bootオプションを無効にするとか，Trusted Platform Module (TPM)が悪さをしているとか，いろいろと調整をしましたが，ビープ音を消すことができませんでした．
困ったな．
