[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


           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 

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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