Hi Greg, The kernel command line parameter, no_console_suspend, enables the serial console to continue to output kernel message during system suspend/resume. However, the PNP bus will disable and power-down pnp devices on system suspend, which defeats the purpose of no_console_suspend; namely to continue to output messages in case those are the last messages before crashing. The first patch is a cleanup of the baroque logic of uart_suspend_port(). The second patch overrides the PNP bus disabling the console device if no_console_suspend is set. This patch uses existing PNP bus logic but perhaps in a way not originally intended. The third patch requires Rafael's ack, as it adds a capability to allow the device to override the power-down function. The fourth patch actually performs the power-down override enabled by patch 3. With these patches, the PNP0501 device (16550A uart) will continue to output messages while system suspend finishes, as intended by the no_console_suspend parameter. [System resume is another problem, which I'm working on]. Regards, Peter Hurley (4): serial: core: Simplify console suspend logic in uart_suspend_port() serial: 8250_pnp: Override pnp disable for no_console_suspend PNP: Allow device to override ACPI device sleep serial: 8250_pnp: Override pnp suspend for no_console_suspend drivers/pnp/driver.c | 2 +- drivers/pnp/pnpacpi/core.c | 2 +- drivers/tty/serial/8250/8250_pnp.c | 61 +++++++++++++++++++++++++++++++------- drivers/tty/serial/serial_core.c | 35 +++++++++++----------- include/linux/pnp.h | 3 ++ 5 files changed, 72 insertions(+), 31 deletions(-) -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
