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). Tom
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