Ticket #1086 (closed defect: fixed)
White pixel "noise" corrupts display dynamically after some boots
|Reported by:||andy@…||Owned by:||willie_chen@…|
|Cc:||buglog@…, olv@…||Blocked By:|
|Blocking:||Estimated Completion (week):|
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
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.