From mboxrd@z Thu Jan 1 00:00:00 1970 From: paul.s.schilling@gmail.com (Paul Schilling) Date: Tue, 10 Apr 2012 16:02:05 -0500 Subject: Samsung S3C2416 framebuffer corruption. In-Reply-To: References: Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 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