diff --git a/kitty/fast_data_types.pyi b/kitty/fast_data_types.pyi
index 4b0e8a0ae..fdbff4818 100644
--- a/kitty/fast_data_types.pyi
+++ b/kitty/fast_data_types.pyi
@@ -1226,7 +1226,7 @@ class Screen:
     def draw(self, text: str) -> None:
         pass
 
-    def dump_lines_with_attrs(self, acc: Callable[[str], None]) -> None:
+    def dump_lines_with_attrs(self, acc: Callable[[str], None], which_screen: int = -1) -> None:
         pass
 
     def apply_sgr(self, text: str) -> None:
diff --git a/kitty/screen.c b/kitty/screen.c
index c37bb5588..cc93d795e 100644
--- a/kitty/screen.c
+++ b/kitty/screen.c
@@ -4701,40 +4701,42 @@ scroll_prompt_to_bottom(Screen *self, PyObject *args UNUSED) {
     Py_RETURN_NONE;
 }
 
-static PyObject*
-dump_lines_with_attrs(Screen *self, PyObject *accum) {
-    int y = (self->linebuf == self->main_linebuf) ? -self->historybuf->count : 0;
-    PyObject *t;
-    while (y < (int)self->lines) {
-        Line *line = range_line_(self, y);
-        t = PyUnicode_FromFormat("\x1b[31m%d: \x1b[39m", y++);
-        if (t) {
-            PyObject_CallFunctionObjArgs(accum, t, NULL);
-            Py_DECREF(t);
-        }
-        switch (line->attrs.prompt_kind) {
-            case UNKNOWN_PROMPT_KIND:
-                break;
-            case PROMPT_START:
-                PyObject_CallFunction(accum, "s", "\x1b[32mprompt \x1b[39m");
-                break;
-            case SECONDARY_PROMPT:
-                PyObject_CallFunction(accum, "s", "\x1b[32msecondary_prompt \x1b[39m");
-                break;
-            case OUTPUT_START:
-                PyObject_CallFunction(accum, "s", "\x1b[33moutput \x1b[39m");
-                break;
-        }
-        if (line->attrs.is_continued) PyObject_CallFunction(accum, "s", "continued ");
-        if (line->attrs.has_dirty_text) PyObject_CallFunction(accum, "s", "dirty ");
-        PyObject_CallFunction(accum, "s", "\n");
-        t = line_as_unicode(line, false);
-        if (t) {
-            PyObject_CallFunctionObjArgs(accum, t, NULL);
-            Py_DECREF(t);
-        }
-        PyObject_CallFunction(accum, "s", "\n");
+static void
+dump_line_with_attrs(Screen *self, int y, PyObject *accum) {
+    Line *line = range_line_(self, y);
+    RAII_PyObject(u, PyUnicode_FromFormat("\x1b[31m%d: \x1b[39m", y++));
+    if (!u) return;
+    RAII_PyObject(r1, PyObject_CallOneArg(accum, u));
+    if (!r1) return;
+#define call_string(s) { RAII_PyObject(ret, PyObject_CallFunction(accum, "s", s)); if (!ret) return; }
+    switch (line->attrs.prompt_kind) {
+        case UNKNOWN_PROMPT_KIND: break;
+        case PROMPT_START: call_string("\x1b[32mprompt \x1b[39m"); break;
+        case SECONDARY_PROMPT: call_string("\x1b[32msecondary_prompt \x1b[39m"); break;
+        case OUTPUT_START: call_string("\x1b[33moutput \x1b[39m"); break;
     }
+    if (line->attrs.is_continued) call_string("continued ");
+    if (line->attrs.has_dirty_text) call_string("dirty ");
+    call_string("\n");
+    RAII_PyObject(t, line_as_unicode(line, false)); if (!t) return;
+    RAII_PyObject(r2, PyObject_CallOneArg(accum, t)); if (!r2) return;
+    call_string("\n");
+#undef call_string
+}
+
+static PyObject*
+dump_lines_with_attrs(Screen *self, PyObject *args) {
+    PyObject *accum; int which_screen = -1;
+    if (!PyArg_ParseTuple(args, "O|i", &accum, &which_screen)) return NULL;
+    LineBuf *orig = self->linebuf;
+    switch(which_screen) {
+        case 0: self->linebuf = self->main_linebuf; break;
+        case 1: self->linebuf = self->alt_linebuf; break;
+    }
+    int y = (self->linebuf == self->main_linebuf) ? -self->historybuf->count : 0;
+    while (y < (int)self->lines && !PyErr_Occurred()) dump_line_with_attrs(self, y++, accum);
+    self->linebuf = orig;
+    if (PyErr_Occurred()) return NULL;
     Py_RETURN_NONE;
 }
 
@@ -4790,7 +4792,7 @@ static PyMethodDef methods[] = {
     METHODB(test_parse_written_data, METH_VARARGS),
     MND(line_edge_colors, METH_NOARGS)
     MND(line, METH_O)
-    MND(dump_lines_with_attrs, METH_O)
+    MND(dump_lines_with_attrs, METH_VARARGS)
     MND(cursor_at_prompt, METH_NOARGS)
     MND(visual_line, METH_VARARGS)
     MND(current_url_text, METH_NOARGS)
diff --git a/kitty/window.py b/kitty/window.py
index 18a9f3c5f..d0b130bdf 100644
--- a/kitty/window.py
+++ b/kitty/window.py
@@ -20,6 +20,7 @@
     Any,
     Callable,
     Deque,
+    Literal,
     NamedTuple,
     Optional,
     Union,
@@ -1005,9 +1006,10 @@ def send_key_sequence(self, *keys: KeyEvent, synthesize_release_events: bool = T
                     self.write_to_child(enc)
 
     @ac('debug', 'Show a dump of the current lines in the scrollback + screen with their line attributes')
-    def dump_lines_with_attrs(self) -> None:
+    def dump_lines_with_attrs(self, which_screen: Literal['main', 'alternate', 'current'] = 'current') -> None:
         strings: list[str] = []
-        self.screen.dump_lines_with_attrs(strings.append)
+        ws = 0 if which_screen == 'main' else (1 if which_screen == 'alternate' else -1)
+        self.screen.dump_lines_with_attrs(strings.append, ws)
         text = ''.join(strings)
         get_boss().display_scrollback(self, text, title='Dump of lines', report_cursor=False)