I would like to have printk output to my ttyS0 console all the time, with 2.6.33-rt17, after kernel is booted up with all messages shown normally on the serial port until I login in, from this point on, all printk messages go to 'dmesg(log_buf)' fine, but I could never get them shown up on serial console anymore. I tried adjust /proc/sys/kernel/printk etc none helped. Switch PREEMPT_RT to PREEMPT_VOLUNTARY and reboot, now everything works, i.e. I can see printk on my console after I login. Look at the RT patch itself, I do find some changes to printk itself, however I'm unsure what is causing this(i.e printk not going to console after login). Thanks, Xianghua -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html