Re: Incorrect color rendering and yellow background in GNU Screen with gemini-cli

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Answering my own question,  I managed to update to `Screen version 5.0.0
(build on 2025-03-12 17:03:22)` and the issue is resolved!

Anton

On Tue, 17 Feb 2026 at 13:04, Anton Kratz <[email protected]> wrote:

> Running a gemini (cli) that uses 24-bit TrueColor or 256 colors inside GNU
> screen results in distorted colors. Lots of background highlighted in
> yellow, overall weird colors. gemini-cli is very hard to use like this.
>
> gemini works when I am not in a GNU screen session.
>
> When inside the GNU screen, $TERM is `screen-256color`.
>
> What I tried:
>
> Verified TrueColor support inside GSC using a printf escape sequence; the
> output correctly displays as orange.
>
> Configured ~/.screenrc with the following parameters to enable TrueColor
> and 256-color support:
>
> altscreen on
> defbce off
> truecolor on
> attrcolor b ".I"
> termcapinfo * 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'
> termcapinfo * 'truecolor@'
> termcapinfo xterm*|putty*|rxvt*|konsole*|gnome-terminal*|xfce4-terminal*
> 'XT'
> term screen-256color
>
> These are my versions:
>
> XFCE 4.20
> openSUSE Tumbleweed, aarch64
> GTK Version 3.24.51
> X11, not wayland
> Screen version 4.09.01 (GNU) 20-Aug-23
>
> Anton
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">Ans=
wering my own question,=C2=A0=C2=A0I managed to update to `Screen version 5=
.0.0 (build on 2025-03-12 17:03:22)` and the issue is resolved!<br><br></di=
v><div class=3D"gmail_default" style=3D"font-size:small">Anton</div></div><=
br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, 17 Feb 2026 at 13:04, Anton Kratz &lt;<a href=3D"ma=
ilto:[email protected]">[email protected]</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div styl=
e=3D"font-size:small" class=3D"gmail_default">Running a gemini (cli) that u=
ses 24-bit TrueColor or 256 colors inside GNU screen results in distorted c=
olors. Lots of background highlighted in yellow, overall weird colors. gemi=
ni-cli is very hard to use like this.</div><div style=3D"font-size:small" c=
lass=3D"gmail_default"><br></div><div style=3D"font-size:small" class=3D"gm=
ail_default">gemini works when I am not in a GNU screen session.<br><br>Whe=
n inside the GNU screen, $TERM is `screen-256color`.<br><br>What I tried:<b=
r><br>Verified TrueColor support inside GSC using a printf escape sequence;=
 the output correctly displays as orange.<br><br>Configured ~/.screenrc wit=
h the following parameters to enable TrueColor and 256-color support:<br><b=
r>altscreen on<br>defbce off<br>truecolor on<br>attrcolor b &quot;.I&quot;<=
br>termcapinfo * &#39;Co#256:AB=3D\E[48;5;%dm:AF=3D\E[38;5;%dm&#39;<br>term=
capinfo * &#39;truecolor@&#39;<br>termcapinfo xterm*|putty*|rxvt*|konsole*|=
gnome-terminal*|xfce4-terminal* &#39;XT&#39;<br>term screen-256color<br><br=
>These are my versions:<br><br>XFCE 4.20<br>openSUSE Tumbleweed, aarch64<br=
>GTK Version 3.24.51<br>X11, not wayland<br></div><div class=3D"gmail_defau=
lt" style=3D"font-size:small">Screen version 4.09.01 (GNU) 20-Aug-23<br><br=
></div><div class=3D"gmail_default" style=3D"font-size:small">Anton</div></=
div>
</blockquote></div>

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