[Bug 1086] New: White pixel "noise" corrupts display dynamically after some boots
bugzilla-daemon at bugzilla.openmoko.org
bugzilla-daemon at bugzilla.openmoko.org
Wed Dec 5 01:34:09 CET 2007
http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=1086
Summary: White pixel "noise" corrupts display dynamically after
some boots
Product: Neo1973 Hardware
Version: GTA02v2
Platform: Other
OS/Version: Linux
Status: NEW
Severity: major
Priority: P2
Component: Screen
AssignedTo: sean_chiang at openmoko.org
ReportedBy: andy at openmoko.com
CC: buglog at lists.openmoko.org
Willie explained that occasionally during boot when the display is
initialized, it suffers from white "noise" pixels that obscures the actual
display data and moves around randomly per frame.
This symptom sounds like memory bus bandwidth being used up and the video data
is not able to keep the display pixel pipeline full all the time. If he
manages to get a boot that exhibits this behaviour, it seems to persist for
the whole boot.
He reports seeing it something like once a day, but of course he reboots a
lot.
If it is due to starvation of the video pipeline then it's interesting that it
only happens sometimes. Maybe init of SDRAM timings or video chip timings is
not 100% reliable.
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