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docs(troubleshooting): update note on AMD lowlatencyenc (Linux) (#3117)

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Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>
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docs/troubleshooting.md
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@ -143,25 +143,24 @@ often grub is used to load the kernel and set its command line.)
### AMD encoding latency issues
If you notice unexpectedly high encoding latencies (e.g. in Moonlight's
performance overlay) or strong fluctuations thereof, this is due to
[missing support](https://gitlab.freedesktop.org/drm/amd/-/issues/3336)
in Mesa/libva for AMD's low latency encoder mode. This is particularly
problematic at higher resolutions (4K).
Only the most recent development versions of mesa include support for this
low-latency mode. It will be included in Mesa-24.2.
In order to enable it, Sunshine has to be started with a special environment
variable:
performance overlay) or strong fluctuations thereof, your system's Mesa
libraries are outdated (<24.2). This is particularly problematic at higher
resolutions (4K).
Starting with Mesa-24.2 applications can request a
[low-latency mode](https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30039)
by running them with a special
[environment variable](https://docs.mesa3d.org/envvars.html#envvar-AMD_DEBUG):
```bash
AMD_DEBUG=lowlatencyenc sunshine
export AMD_DEBUG=lowlatencyenc
```
Sunshine sets this variable automatically, no manual
configuration is needed.
To check whether low-latency mode is being used, one can watch the `VCLK` and
`DCLK` frequencies in `amdgpu_top`. Without this encoder tuning both clock
frequencies will fluctuate strongly, whereas with active low-latency encoding
they will stay high as long as the encoder is used.
To check whether low-latency mode is being used, one can watch the VCLK and DCLK
frequencies in amdgpu_top. Without this encoder tuning both clock frequencies
will fluctuate strongly, whereas with active low-latency encoding they will stay
high as long as the encoder is used.
### Gamescope compatibility
Some users have reported stuttering issues when streaming games running within Gamescope.