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Tsirkin" , Paolo Bonzini , Yiwei Zhang , Sergio Lopez Pascual Cc: Gert Wollny , qemu-devel@nongnu.org, Gurchetan Singh , Alyssa Ross , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Alex Deucher , Stefano Stabellini , =?UTF-8?q?Christian=20K=C3=B6nig?= , Xenia Ragiadakou , Honglei Huang , Julia Zhang , Chen Jiqian , Rob Clark , Robert Beckett Subject: [PATCH v21 02/18] ui/sdl2: Don't disable scanout when display is refreshed Date: Mon, 2 Mar 2026 17:59:04 +0300 Message-ID: <20260302145920.735423-3-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260302145920.735423-1-dmitry.osipenko@collabora.com> References: <20260302145920.735423-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=136.143.188.112; envelope-from=dmitry.osipenko@collabora.com; helo=sender4-pp-f112.zoho.com X-Spam_score_int: -5 X-Spam_score: -0.6 X-Spam_bar: / X-Spam_report: (-0.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.968, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.495, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity dmitry.osipenko@collabora.com) X-ZM-MESSAGEID: 1772463758857158500 Display refreshment is invoked by a timer and it erroneously disables the active scanout if it happens to be invoked after scanout has been enabled. This offending scanout-disable race condition with a timer can be easily hit when Qemu runs with a disabled vsync by using SDL or GTK displays (with vblank_mode=3D0 for GTK). Refreshment of display's content shouldn't disable the active display. Fix it by keeping the scanout's state unchanged when display is redrawn. Reviewed-by: Akihiko Odaki Acked-by: Michael S. Tsirkin Tested-by: Alex Benn=C3=A9e Acked-by: Pierre-Eric Pelloux-Prayer Reviewed-by: Yiwei Zhang Signed-off-by: Dmitry Osipenko --- ui/sdl2-gl.c | 1 - 1 file changed, 1 deletion(-) diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c index 3be17d1079af..5eca0248233e 100644 --- a/ui/sdl2-gl.c +++ b/ui/sdl2-gl.c @@ -51,7 +51,6 @@ static void sdl2_gl_render_surface(struct sdl2_console *s= con) int ww, wh; =20 SDL_GL_MakeCurrent(scon->real_window, scon->winctx); - sdl2_set_scanout_mode(scon, false); =20 SDL_GetWindowSize(scon->real_window, &ww, &wh); surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh); --=20 2.52.0