Samsung S3C2416 framebuffer corruption.

Samsung S3C2416 framebuffer corruption.

[Paul Schilling]

I am having issues with the frame buffer on the S3C2416.  The issue
that I seem to be having is that certain colors especially for some
reason X console screens that are white with black font corrupt the
frame buffer.  It appears that LCD lines get shoved down a number of
lines and will even get wrapped back around from the  bottom to the
top.  I have a Qt app with a solid blue background with no problems.
With this bug the screen is constantly jittering,  I have seen some
times in X where the pointer will cause this screen corruption across
the entire row for as tall as the pointer is on screen.

Second in Linux what would it take to get some video acceleration
support from the 2D accelerator in the S3C2416.  I know there has been
some work done recently on the exynos platform.  I know that the
exynos has 3D accelerator also.

Thanks,
Paul

Samsung S3C2416 framebuffer corruption.

[Paul Schilling]

It turns out that my LCD was getting cross talk from the parallel RGB
data bus.  It was causing glitches on the vertical sync line connected to
the LCD.  When certain colors were displayed it corrupted the LCD
because of the false vertical sync signals.  I fixed the issue by modifying
the drive strength control for those particular bus lines.

-Paul

On Fri, Apr 6, 2012 at 1:12 PM, Paul Schilling
<paul.s.schilling@gmail.com> wrote:
> I am having issues with the frame buffer on the S3C2416. ?The issue
> that I seem to be having is that certain colors especially for some
> reason X console screens that are white with black font corrupt the
> frame buffer. ?It appears that LCD lines get shoved down a number of
> lines and will even get wrapped back around from the ?bottom to the
> top. ?I have a Qt app with a solid blue background with no problems.
> With this bug the screen is constantly jittering, ?I have seen some
> times in X where the pointer will cause this screen corruption across
> the entire row for as tall as the pointer is on screen.
>
> Second in Linux what would it take to get some video acceleration
> support from the 2D accelerator in the S3C2416. ?I know there has been
> some work done recently on the exynos platform. ?I know that the
> exynos has 3D accelerator also.
>
> Thanks,
> Paul