diff -Nru telegram-desktop-2.9.2+ds/debian/changelog telegram-desktop-2.9.2+ds/debian/changelog
--- telegram-desktop-2.9.2+ds/debian/changelog	2021-09-02 19:44:17.000000000 +0300
+++ telegram-desktop-2.9.2+ds/debian/changelog	2021-09-05 13:08:39.000000000 +0300
@@ -1,3 +1,10 @@
+telegram-desktop (2.9.2+ds-1ubuntu3~21.04) hirsute; urgency=medium
+
+  * Backport from impish to hirsute (LP: #1942699).
+  * Disable OpenGL acceleration by default.
+
+ -- Nicholas Guriev <guriev-ns@ya.ru>  Sun, 05 Sep 2021 13:08:39 +0300
+
 telegram-desktop (2.9.2+ds-1ubuntu3) impish; urgency=medium
 
   * Decrease debugging level to 1 for every architecture.
diff -Nru telegram-desktop-2.9.2+ds/debian/gbp.conf telegram-desktop-2.9.2+ds/debian/gbp.conf
--- telegram-desktop-2.9.2+ds/debian/gbp.conf	2021-04-17 22:32:08.000000000 +0300
+++ telegram-desktop-2.9.2+ds/debian/gbp.conf	2021-09-05 13:07:19.000000000 +0300
@@ -1,5 +1,6 @@
 [DEFAULT]
-debian-branch = debian/master
+debian-tag = ubuntu/%(version)s
+debian-branch = ubuntu/hirsute
 upstream-branch = upstream/latest
 ignore-branch = True
 
diff -Nru telegram-desktop-2.9.2+ds/debian/patches/Keep-old-settings.patch telegram-desktop-2.9.2+ds/debian/patches/Keep-old-settings.patch
--- telegram-desktop-2.9.2+ds/debian/patches/Keep-old-settings.patch	1970-01-01 03:00:00.000000000 +0300
+++ telegram-desktop-2.9.2+ds/debian/patches/Keep-old-settings.patch	2021-09-05 13:07:46.000000000 +0300
@@ -0,0 +1,17 @@
+Description: Disable poorly tested acceleration with OpenGL
+ A user can still re-enable this in Advanced Settings.
+Author: Nicholas Guriev <guriev-ns@ya.ru>
+Forwarded: not-needed
+Last-Modified: Wed, 25 Aug 2021 22:03:14 +0300
+
+--- a/Telegram/SourceFiles/core/core_settings.h
++++ b/Telegram/SourceFiles/core/core_settings.h
+@@ -697,7 +697,7 @@ private:
+ 	rpl::variable<std::optional<bool>> _systemDarkMode = std::nullopt;
+ 	rpl::variable<bool> _systemDarkModeEnabled = false;
+ 	WindowPosition _windowPosition; // per-window
+-	bool _disableOpenGL = false;
++	bool _disableOpenGL = true;
+ 	rpl::variable<WorkMode> _workMode = WorkMode::WindowAndTray;
+ 	base::flags<Calls::Group::StickedTooltip> _hiddenGroupCallTooltips;
+ 
diff -Nru telegram-desktop-2.9.2+ds/debian/patches/series telegram-desktop-2.9.2+ds/debian/patches/series
--- telegram-desktop-2.9.2+ds/debian/patches/series	2021-09-02 19:44:17.000000000 +0300
+++ telegram-desktop-2.9.2+ds/debian/patches/series	2021-09-05 13:07:46.000000000 +0300
@@ -13,3 +13,4 @@
 Backport-to-ancient-GCC.patch
 Backport-to-legacy-GSL.patch
 Backport-to-stable-Qt.patch
+Keep-old-settings.patch