[time-nuts] Thunderbolt and USB to RS232 converters
Hal Murray
hmurray at megapathdsl.net
Wed Jun 25 20:02:31 EDT 2008
> That's a good point. The older Prolific drivers had a nasty habit of
> crashing my laptop (Win XP would not wake up) if I put it in
> hibernation with the adapter plugged into the USB socket. The new
> drivers mostly fix the problem. I may occasionaly have to unplug and
> replug the device after waking up, but the OS no longer crashes.
The SIRF GPS units use the Prolific chips.
I have had mixed results with them on Linux.
They don't work like I expect when I try to use several of them on a high
speed hub. The Prolific chip wants some guaranteed bandwidth and Linux has
troubles allocating it. I thought I found a kernel option to get around
that, CONFIG_USB_EHCI_TT_NEWSCHED, but I tried to clean things up last night
and mumble. I guess it helps but not as much as I though. Mumble. It may
be the hub-hub case that doesn't work. I've got a 7 port hub which is really
2 4 port hubs chained.
I haven't noticed any troubles without the hub. I'm not doing anything fancy.
--
These are my opinions, not necessarily my employer's. I hate spam.
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