linux-kernel - [PATCH] vt: add missing notification when switching back to text mode

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Message-ID: <9o5ro928-0pp4-05rq-70p4-ro385n21n723@onlyvoer.pbz>
Date: Tue, 10 Jun 2025 21:41:44 -0400 (EDT)
From: Nicolas Pitre <npitre@...libre.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Jiri Slaby <jirislaby@...nel.org>
cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] vt: add missing notification when switching back to text
 mode

Programs using poll() on /dev/vcsa to be notified when VT changes occur
were missing one case: the switch from gfx to text mode.

Signed-off-by: Nicolas Pitre <npitre@...libre.com>

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index ed39d9cb4432..62049ceb34de 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -4650,6 +4650,7 @@ void do_unblank_screen(int leaving_gfx)
 	set_palette(vc);
 	set_cursor(vc);
 	vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
+	notify_update(vc);
 }
 EXPORT_SYMBOL(do_unblank_screen);