Update latency-and-latency-compensation.html

Added a note about non-constant latency of USB audio interfaces on Linux.

diff --git a/include/latency-and-latency-compensation.html b/include/latency-and-latency-compensation.html
index 01d46286bd5223e12aa7d5c99ec33c92b2dd149c..59cb28415cb0bb651cf75260922539c3fea1c981 100644 (file)
--- a/include/latency-and-latency-compensation.html
+++ b/include/latency-and-latency-compensation.html
@@ -261,3 +261,10 @@
   <li>Make the appropriate connections between the jack ports so the loop is closed.</li>
   <li>Adjust the playback and capture levels in the mixer.</li>
 </ol>
+<p class="warning">
+  On Linux, the latency of USB audio interfaces is not constant. It may
+  change when the interface is reconnected, on reboot and even when xruns
+  occur. This is due the buffer handling in the Linux USB stack. As a
+  workaround, it is possible to recalibrate the latency at the start of each
+  session and each time an xrun occurs.
+</p>