Dear Francis and all T400/ hi-res panel owners, Thanks for the workaround. I can confirm that it is working! Finally I can use my libreboot T400. Fortunately I could do the software flash, so I didn't have to take my laptop apart once more. I did the flashing two times because I made a mistake at first.
I changed the register "gfx.lvds_dual_channel" = "1" in libreboot_src/coreboot/src/mainboard/lenovo/t400/devicetree.cb and then I recompiled libreboot. I think this way I must have overwritten the change because in the end there was no change. So I tried a second time starting with changing the register and then starting with ./build roms withgrub t400_8mb. Like described I inserted my MAC address and copied the ROM file to libreboot_utils and did the flashing again. It worked. Currently I am using Trisquel 7 but I will try Parabola soon, because that's what I've been using before (libreboot). Until now I've been using an old VGA monitor in order to use my T400. When I installed Trisquel I didn't have a wireless connection although I configured everything correctly. It took me almost an hour (stupid, I know) to notice that the time and date setting was set almost a 150 years in the future. I don't know anymore why this was the case but setting the correct time and date led to an immediate internet connection. Thanks again and hopefully this will encourage those with a high resolution panel to try out. I still have only the last third of the gnu and penguin as a boot screen (I really like the image) but the important thing is that I can work with it! Cheers Andreas
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