Hi Daniel, thanks a lot for your debugging. I'm busy at the moment so I'll keep it short. On 11/17/2011 04:24 PM, Daniel Drake wrote: > A further data point on this issue: we once hit exactly the same thing > on XO-1 (geode lxfb). A non-OLPC commit caused the v/h sync output > polarity to change. The display still worked correctly, but the DCON > freeze functionality caused garbage in exactly the same way as this > viafb issue. This suggests that the display itself isn't too fussy > about video signal parameters, but the DCON controller is picky and > expects certain parameters. (see commit ad913da61aeb for the lxfb > fix). As you mentioned it, I had a look at this driver. It looks like viafb does it (polarity) just the other way around than geode. So it might be wort a try to change in drivers/video/via/share.h: /* 1200x900@60 Sync Polarity (DCON) */ #define M1200X900_R60_HSP NEGATIVE #define M1200X900_R60_VSP NEGATIVE to /* 1200x900@60 Sync Polarity (DCON) */ #define M1200X900_R60_HSP POSITIVE #define M1200X900_R60_VSP POSITIVE > Any thoughts? If the above works it's just that the thing was initially entered wrong and now we hit it as we start setting the polarity for the correct devices, similar to the issue with the refresh rate. If it does not work I'll have a deeper look at it as soon as possible. Best regards, Florian Tobias Schandinat -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
