Errata: serial adapter not detected on some Linux systems solved.

doc/rig_interface_mk2.aux

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doc/rig_interface_mk2.log

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doc/rig_interface_mk2.tex

@@ -393,12 +393,21 @@ There are endless ways to enclose the \textit{rig interface MK2}. You can buy a
 \subsection*{Problem}
 Audio of transmission is heavily distorted. Sometimes the transmitter gives up altogether.
 
-\subsection*{Cause}
+\subsubsection*{Cause}
 Output of USB audio device contains a periodic frequency, probably the sampling frequency. This signal modulates the transmitter.
 
-\subsection*{Solution}
+\subsubsection*{Solution}
 Populate both capacitors C5 and C7. Together with the audio transformer, these form a filter, reducing the amplitude of the oscillation frequency.
 
+\subsection*{Problem}
+Under Linux, the sound card is detected, but the serial adapter is not.
+
+\subsubsection*{Cause}
+BRLTTY silently blocks CH340 USB driver. BRLTTY is a braille display driver for Linux/Unix. If you do not use braille devices, it can be safely removed.
+
+\subsubsection*{Solution}
+Remove BRLTTY with the following command: \textit{sudo apt autoremove brltty}. On OpenSuSe, you can use YaST to remove the package.
+
 \clearpage
 
 \section{Open source hardware and software}

q.log

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+**rig_interface_mk2.tex
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+                   \begingroup 
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+OK, entering \batchmode...
+LaTeX2e <2020-10-01> patch level 4
+ L3 programming layer <2021-02-18> File ignored
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+! Emergency stop.
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+                         
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+
+ 
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