[PATCH] fix-lcm-flicker.patch

Werner Almesberger werner at openmoko.org
Thu Mar 27 06:11:13 CET 2008


Andy Green wrote:
> Select instead mode 4 which swaps on alternate lines and frames, so
> we take advantage of EMI reduction but do not see the flicker.

I waited until dark, then tested it and got the following results:

- portrait mode: pressed on "+" and looked at what I got. It's nice
  and stable. I can seen something resembling flicker when moving the
  device or moving the eye, but that may also be an unrelated effect.
  In any case, the image doesn't look deficient.

- landscape mode: I still see line flicker. Nothing like the horrors
  we've had before, but something that's visible. That is, if I look
  carefully and from nearby. If I put on my glasses (I'm near-sighted)
  and hold the device at a distance where I can then see it without a
  blur, I don't notice any flicker anymore.

I tried setting JBT_REG_ASW_SLEW to 0 and to 1, and the line flicker
didn't go away. So I'd say your solution is as good as it gets, and
it seems to be quite sufficient for real-life use.

Congratulations on fixing that bugger !

I've applied the ASW slew change to drivers/video/display/jbt6k74.c
and the comment change in arch/arm/mach-s3c2440/mach-gta02.c in
revision 4258.

Thanks,
- Werner




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