On 04/23/15 04:34, Craig Skinner wrote: ... > Is there something in the boot process that enables console colours if a > monitor is connected?
on some video cards, yes. I haven't seen this in a while (and I'm trusting my memory more than I should), but on some older systems, back in the day of monochrome VGA monitors, the monochrome monitor only connected to the green video line. If the card saw no load on the red and blue lines, it would assume a monochrome monitor, and operate in monochrome mode only. I do recall having soldered a few 75ohm resistors in a mechanical KVM switch box to persuade the video card that there really was a monitor attached when there wasn't. No idea if that could be reset in software. And it's been a loong time since I've seen (or noticed?) this behavior, so I suspect it isn't a common issue now. To be honest, I can't say if it is due to modern video cards being different, modern KVM boxes being smarter, the almost complete elimination of monochrome monitors, or the fact that when I run text, I don't care about color. > Is the kernel behaviour different on boot with/without a monitor > present? On new DRM capable cards, yes. And, looking at your dmesg ... oh wait, you haven't provided us one. Nick.
