diff --git a/0001-Fix-wrong-to-linear-conversion.patch b/0001-Fix-wrong-to-linear-conversion.patch
new file mode 100644
index 0000000..03ee305
--- /dev/null
+++ b/0001-Fix-wrong-to-linear-conversion.patch
@@ -0,0 +1,44 @@
+From e97a4f42b78259da9422b12d1a601d6c8dd93f68 Mon Sep 17 00:00:00 2001
+From: Allan Sandfeld Jensen <allan.jensen@qt.io>
+Date: Tue, 6 Dec 2022 10:42:59 +0100
+Subject: [PATCH] Fix wrong to linear conversion
+
+Causing bad rendering of gamma corrected text on non-standard image
+format paint devices.
+
+Pick-to: 6.4 6.2 5.15
+Fixes: QTBUG-109169
+Change-Id: I6d95e9a42b9ccac609071123dd4535d25e225a29
+---
+ src/gui/painting/qcolortrclut_p.h | 1 +
+ src/gui/painting/qdrawhelper.cpp  | 2 +-
+ 2 files changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/gui/painting/qcolortrclut_p.h b/src/gui/painting/qcolortrclut_p.h
+index 76a6a60803..24fd522e6c 100644
+--- a/src/gui/painting/qcolortrclut_p.h
++++ b/src/gui/painting/qcolortrclut_p.h
+@@ -118,6 +118,7 @@ public:
+         return QRgba64::fromRgba64(r, g, b, qAlpha(rgb32) * 257);
+ #endif
+     }
++    QRgba64 toLinear64(QRgba64) const = delete;
+ 
+     QRgb toLinear(QRgb rgb32) const
+     {
+diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
+index a61793508a..5ba2d277b7 100644
+--- a/src/gui/painting/qdrawhelper.cpp
++++ b/src/gui/painting/qdrawhelper.cpp
+@@ -6091,7 +6091,7 @@ static inline void alphargbblend_argb32(quint32 *dst, uint coverage, const QRgba
+ static inline void rgbBlendPixel(QRgba64 &dst, int coverage, QRgba64 slinear, const QColorTrcLut *colorProfile)
+ {
+     // Do a gammacorrected RGB alphablend...
+-    const QRgba64 dlinear = colorProfile ? colorProfile->toLinear64(dst) : dst;
++    const QRgba64 dlinear = colorProfile ? colorProfile->toLinear(dst) : dst;
+ 
+     QRgba64 blend = rgbBlend(dlinear, slinear, coverage);
+ 
+-- 
+2.38.1
+
diff --git a/libqt5-qtbase.changes b/libqt5-qtbase.changes
index cfd6c44..1f2a0d9 100644
--- a/libqt5-qtbase.changes
+++ b/libqt5-qtbase.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Dec  6 10:37:08 UTC 2022 - Fabian Vogt <fvogt@suse.com>
+
+- Add patch to fix text rendering on 16bit X11 surfaces (boo#1205585):
+  * 0001-Fix-wrong-to-linear-conversion.patch
+
 -------------------------------------------------------------------
 Thu Nov  3 08:50:33 UTC 2022 - Fabian Vogt <fabian@ritter-vogt.de>
 
diff --git a/libqt5-qtbase.spec b/libqt5-qtbase.spec
index 22299ec..2d7ed12 100644
--- a/libqt5-qtbase.spec
+++ b/libqt5-qtbase.spec
@@ -61,6 +61,8 @@ Patch12:        0001-Add-remote-print-queue-support.patch
 Patch21:        0001-Don-t-white-list-recent-Mesa-versions-for-multithrea.patch
 Patch24:        fix-fixqt4headers.patch
 # patches 1000-2000 and above from upstream 5.15 branch #
+# Not accepted yet, https://codereview.qt-project.org/c/qt/qtbase/+/447019
+Patch1001:      0001-Fix-wrong-to-linear-conversion.patch
 # patches 2000-3000 and above from upstream qt6/dev branch #
 # Not accepted yet, https://codereview.qt-project.org/c/qt/qtbase/+/255384
 Patch2001:      0002-Synthesize-Enter-LeaveEvent-for-accepted-QTabletEven.patch