[time-nuts] Thunderbolt and USB to RS232 converters

[Hal Murray]

> 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.