[quoted lines by Hammer Attila on 2024/12/22 at 14:24 +0100]

>In syslog I see now following error message, translate to english for you in
>Ubuntu 20.04, BRLTTY 6.5:
>
>Dec 22 14:01:56 hammera-pc brltty[1410]: unable to connect to polkit:
>g-io-error-quark (159) Error initializing authority: Could not connect: No
>such file or directory (1)
>
>What file missing for BRLTTY and polkit related? When I used the my Alva
>display with USB connection, I not see similar error messages.

I'm not sure. It'd be helpful for me to see the whole log. A way to get brltty 
to log in English is to override the system's locale with the $LANG environment 
variable. Invoking brlttyu like this should work:

   LANG=C brltty -b fs -d serial:ttyACM0

One thing you might check is that the device name still is ttyACM0. The number 
on the end is dynamically assigned so it's always possible that it isn't 0.

When logging, please use -l (lowercase) to specify at least these ctegories:

   -ldebug,serial,inpkts,outpkts

>Another interesting error messages:
>
>Dec 22 14:01:59 hammera-pc brltty[3886]: can't isolate namespaces
...

Those are from a different brltty process that's running on yur system in order 
to support the graphical environment. You can tell because the braille driver 
is ba (BrlAPI) and the screen driver is a2 (AT-SPI-2). The best way to get the 
logs just for the brltty process that you're debugging is to use its -L option 
to direct those logs to a specific file.

>Perhaps me need trying buying a 9 pin serial connector cable to the
>motherboard connector if not have better ydea.

I don't think that'd be necessary.

>Unfortunatelly the display USB port with usb cable is unusable the BRLTTY 6.5
>and higher version, because shows following error message the log file:
>
>[brltty] USB URB status error 75: The value is too large for the specified
>data type
>2024-03-31@14:28:26.852 [brltty] USB: endpoint descriptor not found: 00

Again, I think I'd like to see the whole log in order to try to figure this one 
out.

-- 
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