6.15-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Zimmermann tzimmermann@suse.de
commit 03bcbbb3995ba5df43af9aba45334e35f2dfe27b upstream.
Signal vt subsystem to redraw console when switching to dummycon with deferred takeover enabled. Makes the console switch to fbcon and displays the available output.
With deferred takeover enabled, dummycon acts as the placeholder until the first output to the console happens. At that point, fbcon takes over. If the output happens while dummycon is not active, it cannot inform fbcon. This is the case if the vt subsystem runs in graphics mode.
A typical graphical boot starts plymouth, a display manager and a compositor; all while leaving out dummycon. Switching to a text-mode console leaves the console with dummycon even if a getty terminal has been started.
Returning true from dummycon's con_switch helper signals the vt subsystem to redraw the screen. If there's output available dummycon's con_putc{s} helpers trigger deferred takeover of fbcon, which sets a display mode and displays the output. If no output is available, dummycon remains active.
v2: - make the comment slightly more verbose (Javier)
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reported-by: Andrei Borzenkov arvidjaar@gmail.com Closes: https://bugzilla.suse.com/show_bug.cgi?id=1242191 Tested-by: Andrei Borzenkov arvidjaar@gmail.com Acked-by: Javier Martinez Canillas javierm@redhat.com Fixes: 83d83bebf401 ("console/fbcon: Add support for deferred console takeover") Cc: Hans de Goede hdegoede@redhat.com Cc: linux-fbdev@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v4.19+ Link: https://lore.kernel.org/r/20250520071418.8462-1-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/console/dummycon.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
--- a/drivers/video/console/dummycon.c +++ b/drivers/video/console/dummycon.c @@ -85,6 +85,15 @@ static bool dummycon_blank(struct vc_dat /* Redraw, so that we get putc(s) for output done while blanked */ return true; } + +static bool dummycon_switch(struct vc_data *vc) +{ + /* + * Redraw, so that we get putc(s) for output done while switched + * away. Informs deferred consoles to take over the display. + */ + return true; +} #else static void dummycon_putc(struct vc_data *vc, u16 c, unsigned int y, unsigned int x) { } @@ -95,6 +104,10 @@ static bool dummycon_blank(struct vc_dat { return false; } +static bool dummycon_switch(struct vc_data *vc) +{ + return false; +} #endif
static const char *dummycon_startup(void) @@ -123,11 +136,6 @@ static bool dummycon_scroll(struct vc_da { return false; } - -static bool dummycon_switch(struct vc_data *vc) -{ - return false; -}
/* * The console `switch' structure for the dummy console