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    SubjectRe: [PATCH] i486 CR4 oops, no_console_suspend
    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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