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PM: sleep: console: Fix the black screen issue

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When the computer enters sleep status without a monitor
connected, the system switches the console to the virtual
terminal tty63(SUSPEND_CONSOLE).

If a monitor is subsequently connected before waking up,
the system skips the required VT restoration process
during wake-up, leaving the console on tty63 instead of
switching back to tty1.

To fix this issue, a global flag vt_switch_done is introduced
to record whether the system has successfully switched to
the suspend console via vt_move_to_console() during suspend.

If the switch was completed, vt_switch_done is set to 1.
Later during resume, this flag is checked to ensure that
the original console is restored properly by calling
vt_move_to_console(orig_fgconsole, 0).

This prevents scenarios where the resume logic skips console
restoration due to incorrect detection of the console state,
especially when a monitor is reconnected before waking up.

Signed-off-by: tuhaowen <tuhaowen@uniontech.com>
Link: https://patch.msgid.link/20250611032345.29962-1-tuhaowen@uniontech.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
tuhaowen 2025-06-11 11:23:45 +08:00 committed by Rafael J. Wysocki
parent 3e7e5adcd2
commit 4266e8fa56
1 changed files with 6 additions and 1 deletions
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7
kernel/power/console.c
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@ -16,6 +16,7 @@
#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
static int orig_fgconsole, orig_kmsg;
static bool vt_switch_done;
static DEFINE_MUTEX(vt_switch_mutex);
@ -136,17 +137,21 @@ void pm_prepare_console(void)
if (orig_fgconsole < 0)
return;
vt_switch_done = true;
orig_kmsg = vt_kmsg_redirect(SUSPEND_CONSOLE);
return;
}
void pm_restore_console(void)
{
if (!pm_vt_switch())
if (!pm_vt_switch() && !vt_switch_done)
return;
if (orig_fgconsole >= 0) {
vt_move_to_console(orig_fgconsole, 0);
vt_kmsg_redirect(orig_kmsg);
}
vt_switch_done = false;
}