From 6265df53b224e82a6843e3284be371230cec51fe Mon Sep 17 00:00:00 2001
From: oubayashi <214973957@qq.com>
Date: Thu, 24 Sep 2026 14:48:15 +0800
Subject: [PATCH] Prefer IPP color mode default over ColorModel

Some clients continue to send the legacy ColorModel=Gray option when
switching the printer default back to color. This stale value caused CUPS
to select monochrome before processing print-color-mode-default.

Only translate ColorModel when print-color-mode-default is absent so the
standard IPP default takes precedence while preserving compatibility with
clients that only provide the legacy PPD option.
---
 scheduler/ipp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scheduler/ipp.c b/scheduler/ipp.c
index 398c76fbb..a8af0699b 100644
--- a/scheduler/ipp.c
+++ b/scheduler/ipp.c
@@ -2417,7 +2417,8 @@ add_printer(cupsd_client_t  *con,	/* I - Client connection */
 
   set_device_uri = 0;
 
-  if ((attr = ippFindAttribute(con->request, "ColorModel", IPP_TAG_NAME)) != NULL)
+  if (!ippFindAttribute(con->request, "print-color-mode-default", IPP_TAG_ZERO) &&
+      (attr = ippFindAttribute(con->request, "ColorModel", IPP_TAG_NAME)) != NULL)
   {
     const char * keyword = NULL;