Ticket #12394 (closed defect: fixed)

Opened 22 months ago

Last modified 20 months ago

XO-4 DCON unfreeze glitch

Reported by: Quozl Owned by: Quozl
Priority: normal Milestone: 4-firmware
Component: ofw - open firmware Version: Development firmware
Keywords: Cc: wad, pgf
Action Needed: no action Verified: no
Deployments affected: Blocked By:


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

Changed 22 months ago by Quozl

Test build provided for verifying solution.

Changed 22 months ago by Quozl

  • milestone changed from Not Triaged to 4-firmware

Changed 22 months ago by Quozl

  • next_action changed from review to diagnose

1.2 GHz SKUs still glitch.

Changed 20 months 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.

Changed 20 months ago by Quozl

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

Changed 20 months 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.)

Changed 20 months ago by Quozl

  • status changed from new to closed
  • next_action changed from diagnose to no action
  • resolution set to fixed

Is in Q7B15.

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