Messages in this thread | | | Date | Wed, 20 Aug 2008 22:37:15 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] i486 CR4 oops, no_console_suspend |
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David Fries wrote: > On Tue, Aug 19, 2008 at 09:07:26AM -0700, H. Peter Anvin wrote: >> Ingo Molnar wrote: >>> i've had trouble no end with getting even kernel messages out to the >>> serial console during critical phases of suspend/resume. (especially in >>> combination with earlyprintk=ttyS0 - not surprisingly) >>> >>> Especially during resume the UART is initialized back to something >>> really slow - 300 bauds or 9600 bauds. (depends on the chipset i guess) >>> So even though it works, it will only worked reliably when i >>> standardized all my baud settings to that very low setting. >>> >> Probably depends on the BIOS, actually; I suspect you end up with the >> standard BIOS setting, which is *usually* 9600 bps. > > I have grub, the kernel, and a getty all set to 115200, for suspend, > resume, or reboot it's always 115200. With grub there's no BIOS > guessing, it sets it to a configured state. >
Most likely it never gets reinitialized during resume. This is a bug, obviously.
-hpa
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