Aug 25, 2014 - 11:47pm
I'm not able to enable 3840x2160@60hz in ubuntu. I can see from my monitors menu (Asus PB287Q) that it is at 60hz during grub menu but immediately when ubuntu switches display it does back to 30hz.
-Intel i5 4460
I have tried:
-change DP stream to 1.2 from monitors menu
-install latest intel graphics 1.06
-tried adding new modeline with xrandr and also added it to /usr/share/X11/xorg.conf.d/10-monitor.conf
-tried changing output with xrandr but i get "xrandr: configure crtc 0 failed"
Any advice? Does this need edid quirk in drm_edid.c or something to driver?
EDIT: decode edid was garbage becasue of wrong input format... now fixed
Seems that this problem has been solved in the (at least) latest drm nightly. I installed latest kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2014-08-... in to my ubuntu 14.04 and after reboot xrandr gives the option to 60hz. Then it also allows to change the mode with xrandr and also monitors osd confirms that 3840x2160@60Hz is enabled.