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Interesting. I have Intel graphic at work so there should be KMS enabled by default. So all I need to do is enable KMS in intramfs (wiki.archlinux.org/index.php/Intel_Graphics#Kernel_Mode_Setting), find correct EDID files for both monitors, include them to initramfs and add boot parameter drm_kms_helper.edid_firmware=LVDS1:edid/for_LVDS1.bin,HDMI1:edid/for_HDMI1.bin. Is that correct?

piotrekkr
– piotrekkr

2014-06-17 19:06:13 +00:00
Commented Jun 17, 2014 at 19:06
@piotrekkr - That should do it, yes. One interesting thing about this is that you can also set them to always be enabled - even when they're not connected - so the X display that would normally be assigned to them when they are can be set to always be enabled whether or not they're there.

mikeserv
– mikeserv

2014-06-17 19:09:47 +00:00
Commented Jun 17, 2014 at 19:09
Thanks for your answer. I'll try it tomorrow. Two more question. Will there be any problems when I disconnect external monitor and use another monitor with different native resolution? Will it try to switch to new resolution or will it stick to old one set by boot option? In your comment you wrote that I can set them to be enabled always. What do you mean by them? EDID files with correct resolutions?

piotrekkr
– piotrekkr

2014-06-17 19:25:27 +00:00
Commented Jun 17, 2014 at 19:25
@piotrekkr - Yes, you can configure the display ports that the EDIDs describe to always be active. Regarding the possibility of using other monitors on the same port ... Hmm. I'm not really certain what might happen in that context. I guess the worst case is a reboot to a configuration lacking the kernel parameter would be necessary, but I've never had occasion to find out.

mikeserv
– mikeserv

2014-06-17 19:31:19 +00:00
Commented Jun 17, 2014 at 19:31
I've tried your solution but with no luck. Can you look at my updated question?

piotrekkr
– piotrekkr

2014-06-18 08:44:16 +00:00
Commented Jun 18, 2014 at 8:44

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