no game sound after sleep mode

Did you try without secondary monitor plugged in ?

If this is only a sound routing issue you could try this app https://softradar.com/audio-router/

Set the sleep mode to a higher needed time till it starts or disable the afk mode of the laptop.

I am having a similar problem, but if i put it manually to sleep again and wake it up, the sound comes back :D Not a real solution, but its something... 😅

https://www.google.com/search?q=laptop+no+sound+after+sleep+mode&oq=laptop+no+sound+after+sleep+mode&aqs=edge..69i57.5718j0j1&sourceid=chrome&ie=UTF-8

Seems to be a common issue, some suggestions, update your bios, not have the latest nvidia drivers.

after returning [from Sleep] the sound in the game is gone.

That should be tied into the game(s) in question utilizing specific outdated sound software, or utilizing their sound software in a clumsy manner. *As I recall* the process: PCs won't shut down if there's an active audio context connection; Depending on how a game and its associated sound software is configured, this can result in a game being set up to effectively lock out sleep mode (due to the resources remaining in use), being set to load in and out of sleep mode without issue, or being set to load into sleep mode but then fail to reattach to the associated hardware resources once returning from Sleep Mode. In that last case, given how the context'd need to be reeactivated, and that a context is enabled specific to a given game, this results in the game in question needing to be reloaded to reactivate the associated sound. [If I'm misrecollecting anything, and anyone happens to notice, do please note corrections.]

[ Simple version: Some games just aren't configured to operate well with Sleep mode, due to having their audio connections being configured in a way that will either block Sleep mode out or not reenable sound after returning from Sleep mode. ]

Regardless of the actual underlying functioning, I've personally also had that issue with specific games, with the effect occuring regardless of the device and software used, and with ready feedback from other online users indicating that it was also specific to that game for them as well. I wasn't ever able to find a fix for any of the affected games, ultimately just opting to disable sleep mode instead on my gaming-oriented computers. ( That said, if any of the other users here do end up giving you a fix that does manage to work, do give me a poke and let me know. :) )

(Note, the games with problems that are in question are consistent in their having sound loss per load from Sleep mode, with the issue also being consistent across devices. If you're having any inconsistencies, then you may be facing a different issue, of which several other posts seem to have already given possible approaches for addressing.)

This probably happens because the HDMI connection drops when the laptop goes to sleep and the HDMI audio driver disables itself.
Either the game is still connected to that specific audio connection or the the connection that was the default one when the HDMI connection dropped is selected for the game.

possible solutions:

• switch the current audio to your speakers, then switch it back to HDMI (Sound Settings -> Output -> change the selected device in the drop down)
• set the HDMI device as the default one in Control Panel -> Hardware and Sound -> Manage Audio Devices and set the HDMI audio as the default one
• try finding newer drivers for the HDMI audio interface as it could be a bug

also it could be a bug related to that specific game, try to run a different game and experiment with that

unfortunately that's all that I coud find via sleuthing the internet, hope it helps you.

I used to face similar issues when I had a laptop. I think for some games I was able to fix it by toggling the audio output device, iirc, while for other I had to restart the game. What DeS3InY said seems to be really helpful too.

Another tip is to play an video on loop in the background while gaming or disable sleep (you can easily toggle between power profiles if you want sleep while not gaming). This is similar to the suggestion above about increasing the time before system goes to sleep, however, this way you can prevent the system from going to sleep only when gaming. So, this might be the solution to "save that little energy" issue.

Unity-based games are shocking for audio issues. If you've had no luck with the other suggestions, I'd see if you can track down whether it's just certain games that have this issue.