#186: Pre-BTest PS/2 port unreliable.
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Reporter: warp | Owner: [EMAIL PROTECTED]
Type: defect | Status: new
Priority: blocker | Milestone: BTest-1
Component: hardware | Resolution:
Keywords: |
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Comment (by [EMAIL PROTECTED]):
I'll answer in order to get you going sooner, since the people who did the
work are probably asleep. I was listening in on IRC while they were
discussing the issue, so I know a little about what they were doing.
They were testing the AUX port without anything connected to it, by using
the loopback feature. The D3 command to the i8042 is supposed to cause
the next byte to be inserted into the AUX port output register, even if
there is nothing attached to the port. That loopback feature was failing
(and also attempts to use the real touchpad were failing). I believe that
the Linux driver depends on that loopback test as a sanity check for the
driver startup.
It is also possible simply to look at the value of EC register FC83 and
verify that it has the wrong values. According to the 3700 spec, the
value "59" does not enable the D3 command, because the 0x20 bit is not
set.
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Ticket URL: <http://dev.laptop.org/ticket/186#comment:9>
One Laptop Per Child <http://laptop.org/>
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