Opened 4 years ago

Closed 4 years ago

Last modified 20 months ago

#12394 closed defect (fixed)

XO-4 DCON unfreeze glitch

Reported by: Quozl Owned by: Quozl
Priority: normal Milestone:
Component: ofw - open firmware Version: Development firmware
Keywords: Cc: wad, pgf
Blocked By: Blocking:
Deployments affected: Action Needed: no action
Verified: no


A momentary dimming or brightening of the display occurs during dcon-unfreeze.

This is because the DCON is switched without paying attention to the timing of the video signal.


Solution found, being tested.

Change History (8)

comment:1 Changed 4 years ago by Quozl

Test build provided for verifying solution.

comment:2 Changed 4 years ago by Quozl

  • Milestone changed from Not Triaged to 4-firmware

comment:3 Changed 4 years ago by Quozl

  • Action Needed changed from review to diagnose

1.2 GHz SKUs still glitch.

comment:4 Changed 4 years ago by Quozl

  • Cc pgf added

This was fixed for Open Firmware on 1 GHz and 1.2 GHz SKUs.

On build 26 kernel 9e42d55 the glitch is seen on runin resume.

comment:5 Changed 4 years ago by Quozl

svn 3521 fixes this for XO-4 and XO-1.75 for each supported CPU speed.

comment:6 Changed 4 years ago by Quozl

(In random review of Open Firmware source encountered wait-frame-done example in the DRAM recalibration code. It clears then waits for rising edge IRQs for the video and graphic panel path frames. This might replace the empirically determined synchronisation delay in screen-unfreeze, leading to CPU speed independent unfreeze.)

comment:7 Changed 4 years ago by Quozl

  • Action Needed changed from diagnose to no action
  • Resolution set to fixed
  • Status changed from new to closed

Is in Q7B15.

comment:8 Changed 20 months ago by Quozl

  • Milestone 4-firmware deleted

Milestone 4-firmware deleted

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