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    SubjectRe: [2/6] 2.6.21-rc2: known regressions


    On Fri, 9 Mar 2007, Ingo Molnar wrote:
    > > Some day we may have modesetting support in the kernel for some
    > > graphics hw, right now it's pretty damn spotty.
    >
    > having no video is what i'd have expected - but getting a /hang/ is not
    > what i'd have expected.

    I debugged a case exactly like this (with the TRACE_RESUME() thing) back
    last November on my laptop.

    The problem is that radeonfb actually *tries* to re-initialize the
    graphics chips, but because it doesn't know all the details, it does it
    wrong, and hangs the whole chip.

    I forget exactly where it happened, and it might well be different for
    you. But this is exactly what TRACE_RESUME can be used to pinpoint if you
    want to try to debug it.

    Linus
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