#10999 NORM Not Tri: XO-1.75 A3 idt1338 chip loses oscillator over laptop power cycle
Zarro Boogs per Child
bugtracker at laptop.org
Wed Jun 15 17:57:29 EDT 2011
#10999: XO-1.75 A3 idt1338 chip loses oscillator over laptop power cycle
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Reporter: Quozl | Owner: wad
Type: defect | Status: assigned
Priority: normal | Milestone: Not Triaged
Component: hardware | Version: 1.75-A2
Resolution: | Keywords:
Next_action: diagnose | Verified: 0
Deployment_affected: | Blockedby:
Blocking: |
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Comment(by wad):
Interesting result --- wiring up Vdd to a voltage divider tied to +3.3VSUS
fixed the problem. This doesn't sound interesting, as +3.3VSUS is not
turned off when the laptop is powered off, but removing all power from the
motherboard (forcing the IDT1338 to switch to the Vbat input) didn't
trigger the problem.
I believe the problem is due to the power-off waveform of Vdd. I would
note that the registers of the IDT1338 always report the amount of time
since the last power-off!
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Ticket URL: <http://dev.laptop.org/ticket/10999#comment:8>
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