On Fedora 10 lshw triggers a kernel warning about deprecated pcmcia ioctls the first time it gets run after boot. I want to suppress that kernel message from appearing on the console when lshw is run from /etc/rc.local on a custom livecd. Plymouth seems to muck with the kernel.printk setting in a non obvious way. If I try to change the kernel.printk setting via /etc/sysctl.cfg, via loglevel=0 on the kernel command line, or via echo 0 > /proc/sys/kernel/printk right before lshw gets run in the rc.local, it does't work if plymouth is run. If I remove rhgb from the kernel command line so that plymouth is not run, all three ways work. Is there anyway to have the svelt plymouth boot along with suppressed console logging?
I should add that I only care about textmode plymouth and am running with nomodeset and vga=0x311 also on the kernel command line.
right now we do this: klogctl (6 /* disable printk */, NULL, 0) when starting so that the kernel doesn't show messages in the progress bar and then do klogctl (7 /* enable printk */, NULL, 0) to restore it to the default value when plymouth exits. I wonder if disabling it and then reenabling it is some how resetting the configured loglevel? Or maybe the kernel ignores requests to change the loglevel when kernel logging is disabled? We may have to get this fixed in the kernel, but first we'll have to figure out which is happening.
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