Bug#857808: debian-installer: Garbage on terminal with default TERM setting over serial console
Samuel Thibault, on dim. 19 mars 2017 19:15:08 +0100, wrote:
> Samuel Thibault, on dim. 19 mars 2017 18:12:46 +0100, wrote:
> > Samuel Thibault, on dim. 19 mars 2017 17:25:36 +0100, wrote:
> > > John Paul Adrian Glaubitz, on mer. 15 mars 2017 12:05:56 +0100, wrote:
> > > > Basically, it works when booting with TERM_TYPE=linux (no colors)
> > > > or TERM=ansi (setting TERM=linux produces garbage as well). It
> > > > does not work when not setting TERM or TERM_TYPE at all or when
> > > > setting TERM to vt102.
> > >
> > > Well, what terminal are you actually using on the serial port?
> >
> > Are you actually using a terminal software between the serial output and
> > your Konsole? If not, it is not surprising bogus things happen, see the
> > manual, you can e.g. use screen in between to convert from vt102 to your
> > Konsole desires.
> >
> > More precisely, the issue here seems to be with ACS, which is spuriously
> > getting set (or perhaps rather missing getting cleared) by your terminal
> > here.
>
> And I'm wondering whether that could come from some \0 characters added
> by ncurses to "respect" the baud speed.
>
> Would you be able to tinker your test images to inject
>
> stty speed 0
>
> before screen gets started? e.g. in lib/debian-installer.d/S70menu
>
> (it's a crude hack to make it emit zero \0 characters, just to check
> whether those are the culprits)
Another way would be to use
export NCURSES_NO_PADDING=1
before screen gets started
Samuel
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