I think I was wrong; probably it is a different problem. It happened long
time ago. Maybe I saw it in another machine.
I've tried a Trisquel 4.0 live session and now I think that I'm experiencing
the problem I had in the past. I'll describe the case with the hope of help,
not being off-topic.
If I try 4.0 "live without installing", I see a big blue trisquel in the
middle of the screen, but after finishing the step, screen turns black and
then the system doesn't respond (also to Ctr+Alt+PrtSc REISUB), so I have to
switch off the computer pressing the power button. If I try "safe graphic
mode" I see this message everytime on the screen changing the numbers xxxxx
and yyyyy.
[sr0]Add: Sense: Unrecovered read Error
end_request: I/O error, dev sr0 sector xxxx
Buffer I/O error on device sr0, logical block yyyyy
But after some time it goes away and it carries me to the graphical login
(I'd like adding that I tried it turning between tty1 and tty7).
I installed Trisquel 5 with the only problem of the brightness. The current
situation, after upgrading, is that brightness cannot be set, but if I
through out the power wire (and optionally entered in the correct site again)
then I can control the brightness correctly with the Fn key. I always do this
procedure because the default (fixed) level of bright is a bit low.
I hope that it be useful. Sorry for reporting without being sure.
