umass causes panic on 7 amd64
tevans.uk at googlemail.com
Mon Apr 21 08:49:18 UTC 2008
On Sat, 2008-04-19 at 08:46 +1000, Peter Jeremy wrote:
> On Thu, Apr 17, 2008 at 07:13:17PM -0400, Garrett Wollman wrote:
> >In my experience, umass over EHCI has never worked on any machine
> >ever, going back to 5.x and over multiple kinds of umass devices. (I
> >never saw panics, only triple-fault CPU resets.)
> OTOH, I've had mixed results, though I haven't seen panics caused by
> EHCI. umass has a tendency to panic when it trips over an interface
> bug between bus_dmamem_alloc(9) and contigmalloc(9) which has been
> present since at least 4.x, though the work-arounds have improved and
> this is less of a problem than it was 3 years ago.
> On my laptop (HP nx6125, ATI SB400 chipset), I haven't had any problems
> with EHCI in 6.x or 7.0 (both amd64 - I can't recall if I've tried ECHI
> whilst running i386).
> My son's laptop (HP V6107au, nVIDIA MCP51 chipset, 6.x/amd64) gives
> varying results (sometimes it works, sometimes it doesn't) and he's
> found that plugging flashdisks into the USB hub on his keyboard gives
> better results than plugging them into the system (which doesn't make
> sense to me - they still show a attached to EHCI).
> My work desktop (Dell OptiPlex GX620, Intel ICH7 chipset 7.0/amd64)
> refuses to acknowledge EHCI devices - it just reports timeouts and
> disables that USB port. [See my recent posting to -amd64].
Is the keyboard hub self powered? Maybe some devices draw more current
than expected, causing fragile bus powered ports to fail (which would
quickly cause a panic).
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