This started on the stock pixel OS, before I was using graphene. Everything was working, but I disabled the stock pixel clock app. Then my alarm didn't ring anymore.
I wanted to use GrapheneOS anyway and I thought this was a software issue, that would solve itself in the installation progress. Sadly the issue still remains and I can't hear my alarm, there is no sound.
The alarms do go off, but they stay silent.
I have the alarm volume all the way up. AFU or BFU doesnt matter.
I use the grapheneOS stock clock app and have gradually increase volume set to off.
If I change the alarm or timer sound it doesn't change anything. Odd is, that I can't even "preview" the sound, it just stays silent. This is the same for the clock app and the setting app, nowhere I can preview the sounds.
Even though I barely use it, I noticed the speaker of the phone app is also not working. So when I'm talking on the phone I can hear the other person, but when I want to turn the speakers on there is no sound at all.
If I connect a bluetooth speaker or headphones all the mentioned sounds work.
I tried to give the stock phone app and the stock clock app ALL permissions, still doesn't work.
I tried all this in the owner profile and I am on the newest update.
Other sounds from other apps like media playback or videos work normally and can access my speakers. I hear everything and it is loud, too. Even without headphones or bluetooth speakers.