Re: USB-to-PS/2 adaptor: mouse works, keyboard doesn't
Boyd Stephen Smith Jr. wrote:
> On Monday 2009 January 05 06:28:31 Emanoil Kotsev wrote:
>> USB is powered when you attach the device. This means the usb device gets
>> power over the bus after attaching it. I've read about power on/off with
>> specific usb disks and devices. You may google about it.
> That's not the whole story though. According to the specification, power
> over USB is limited to 100mA until the both sides (host and device)
> negotiate, as
> which point it is limited to 500mA. Unfortunately, some implementations
> have ignored this, and assume the other side will as well, expecting 500mA
> at all times.
I never came that far. I assume you are right, because it makes sense.
> Linux is compliant with the specification. Not *just* because "it's the
> standard" but because providing 500mA *could* physically damage devices
> aren't expecting it. Unfortunately, this can cause problems with (but not
> damage to) non-compliant devices when they only get 20% of the power they
> are expecting.
Hm, don't know, may be.
About your issue I can assume that your decise is not recognised correctly
Bus 001 Device 002: ID 13ba:0017 Unknown PS/2 Keyboard+Mouse Adapter
have a look here - it seems releated
Comment #7 From Tim "Taiwanese" Liim 2008-09-24 21:34:55 EDT -------
Please reassign, now that we know the offending module
------- Comment #8 From Peter Hutterer 2008-09-26 00:45:24 EDT -------
Tim, can you cross-check with Bug 456936 please.
This issue should be fixed with xorg-x11-server-Xorg-1.5.0-2.fc9
------- Comment #9 From Tim "Taiwanese" Liim 2008-09-26 01:07:39 EDT -------
Thanks, Peter. That worked fine for me. Indeed my PS2->USB converter
has both keyboard and mouse on it, thus fits description of bug 456936.
I'll mark this bug as duplicate.
*** This bug has been marked as a duplicate of 456936 ***