From eda665208145d14c8eb506d248716e8063af2689 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Thu, 21 May 2026 11:29:36 +0200
Subject: [PATCH] Log import failure tracebacks during backend autodetection
 fallback.

This should help troubleshooting backend autodetection issues.
---
 lib/matplotlib/pyplot.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
index 57f5ac08e398..9c3f7e698cde 100644
--- a/lib/matplotlib/pyplot.py
+++ b/lib/matplotlib/pyplot.py
@@ -428,7 +428,9 @@ def switch_backend(newbackend: str) -> None:
         for candidate in candidates:
             try:
                 switch_backend(candidate)
-            except ImportError:
+            except ImportError as exc:
+                _log.debug("Skipping backend candidate %r as loading failed.",
+                           candidate, exc_info=True)
                 continue
             else:
                 rcParamsOrig['backend'] = candidate