Felix Miata wrote: > I now suspect the problem is that the modesetting driver is limited to > 8192 X 8192, and he has 3840 + 3840 + 1920 = 9600, and that points out the > "device" that is "out of space" might be the framebuffer? Maybe indeed his > solution is the Intel driver's 32767 X 32767 buffer. Looks to me like > moving his 1920x1200 under or over one of the other two would light it up > with the modesetting driver but to keep them all side by side would indeed > require the intel driver instead of the new in Stretch modesetting > default.
Yes this sound plausible. I use Intel with two external monitors, but they are both 1920 max. He can try with sizes in the given range and see if it works. regards