#2274: Kernel regression: white screen of death reappeared with 2.6.29
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Reporter: CyrusDreams | Owner: openmoko-kernel
Type: defect | Status: new
Priority: highest | Milestone: stable-kernel-2009.1
Component: System Software | Version: GTA02v5
Severity: critical | Keywords: WSoD white screen suspend
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible:
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Comment(by joerg):
obviously still not solved
AIUI "newer" kernels implement complete power down of LCM via power
regulator (PMU LDO) switchoff.
On resume it is mandatory for whoever does init of LCM video chip JBT6k74
to wait for sabilization of VDD power, after LDO is enabled. Alas I don't
know any good inicator to probe if voltage has stabilized, probably we'll
need a usleep() of empirically determined duration here (my guess is 100ms
should be sufficient)
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Ticket URL: <https://docs.openmoko.org/trac/ticket/2274#comment:9>
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