Lenovo Linux Drivers

[Asia Jordan]

Ihave a Lenovo Thinkpad X220 and want to connect it to an external monitor through the displayport (DP). After plugging the cable, the monitor remains black and KDE Settings nor xrandr show any detected output other than the laptop screen. I spent one day browsing through forums but I'm not sure whether this is a known issue or not. It seems that those who can switch to nvidia drivers have sometimes solved the issue, but I don't have a nvidia card.

UPDATE: Today i've also tried to use a DP-to-HDMI cable and connected the laptop to the HDMI port of the TV (today I cannot use the same screen I was referring to the other day) because I've read that using a DP-HDMI adapter fixed similar issues for some other user. However, even in this case the TV is not recognized in xrandr.

I think i'll install Windows over the weekend, just to make sure the DP works correctly. However, I think this is the case because the DP does work during the boot (my BIOS has an option to output the boot over DP instead of using the laptop screen) but stops working after the DE is loaded. For some reason, it seems that Linux does not recognize the DP at all!

You made me try this out again, and now it works. The last time i tried this was last year. Seems like a kernel or i915 update has fixed it. Or maybe it was the procedure i did when connecting DP...

Laptop was suspended. Plugged in DP, resumed from suspend, xrandr listed DP, did xrandr --auto and it worked.

EDIT:

Packages up-to-date, linux 3.19.3-3, xf86-video-intel 2.99.917-4, only integrated GPU no nvidia

You made me try this out again, and now it works. The last time i tried this was last year. Seems like a kernel or i915 update has fixed it. Or maybe it was the procedure i did when connecting DP...

Laptop was suspended. Plugged in DP, resumed from suspend, xrandr listed DP, did xrandr --auto and it worked.

[It took me a while to realize you have actually replied to my question by editing your previous post ] Anyway, no luck, i've updated the kernel and the intel driver but it still doesn't work. Can you please confirm you use a DP to DP cable?

What i would try if i were you is a minimal windowmanager like openbox or i3 instead of a desktop environment like KDE, and not use a login manager. The DE's and login managers mess with the display configuration, while the WM's leave display configuration to the user. Try to install openbox or i3, disable the login manager, and use startx and xinitrc to start the window manager. Then run xrandr and maybe also

xrandr --output DP1 --auto --output LVDS1 --off

and see what happens.

This is basically what i do. I have the command xrandr --DP1 --auto --output LVDS1 --off in xinitrc, and i use i3 with startx and no login manager. Also i have the monitor connected and powered on when i start the laptop. Try to replicate that setup.

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