On Mon, Oct 14, 2013 at 7:50 PM, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote: > Okay, next question(s). > > 1. How well tested is any of this imx-drm stuff? > > 2. What sort of testing has it been subject to? Most of my tests with the imx-drm driver have been through the LVDS panel so far. For HDMI, I haven't gone through too much of testing yet, only basic raw framebuffer at full HD resolution. I know Tony/Robert (and Sascha) and some folks at the Wandboard mailing list have also tested HDMI with the previous version of the HDMI driver that was posted by Tony. > Answers to these two questions may help stop me wasting a lot of time > chasing what is a really weird bug. > > So, I have X up and running on the Cubox-i carrier-1, using the imx-drm > stuff (I've slightly hacked my xf86-armada X driver to get this working.) > This works fine - it detects the connectors, selects an appropriate > video mode and produces a picture of the correct shape and size. > > However... I see really weird effects colouring effects - almost like > water over the image. It's certain colour transitions in the image > which seem to trigger this. There are also certain pixels which > "twinkle". > > Text looks very strange too. Rather than the font being crisp and clear, > it looks like there's red and green shift to it - but its not that it's > all shifted in that way. > > Now, if I use the modetest utility from libdrm-2.4.43 to display a SMPTE > test pattern, this again looks right, but there are several vertical > single pixel lines of noise. The most striking one is below the upper > red bar in the lower dark area. I have a single pixel noisy vertical > line. Ok, interesting. Will run a video test pattern via gstreamer videotestsrc plugin to see how it behaves. I am travelling tomorrow, so it will be at last in 2 weeks that I will be able to access a mx6 hardware. In the meantime, maybe one of the folks in Cc could share some ideas. Regards, Fabio Estevam _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
