On Wed, Dec 2, 2015 at 2:49 PM, joem joem@martindale-electric.co.uk wrote:
On Tue, 2015-12-01 at 16:05 +0000, Luke Kenneth Casson Leighton wrote:
http://rhombus-tech.net/community_ideas/laptop_15in/news/
it's by no means perfect, but i have at least data on-screen. i suspect EM interference is causing the corruption
Looks to me like a timing signals error from the CPU with the LCD driver chip trying to do its best to keep sync.
it's as if the HSYNC - no matter what parameters are used - is entirely missing. so the LCD takes the very first bits of each line and uses that as "sync".
Need to check with a scope against the specs of the LCD and what the CPU is generating.
yehh my scope's only a max of 75mhz (maplin's digital scope)
and i can't ramp things down in order to check, because the 3.4 kernel sunxi lcd code changes the clk_div parameter when the dclk rate is set lower, such that entirely different code is activated.
tricky...
l.