Nov 12, 2015 - 02:42pm
I currently cannot display UHD 60fps on HMDI 2.0 from my Asus Fatal1ty Z170 Gaming MB (http://www.asrock.com/mb/Intel/Fatal1ty%20Z170%20Gaming-ITXac/)
It am able to output UHD 30fps so far.
I am running kernel v4.4.2 (Linux test-desktop 4.4.2-040402-generic #201602171633 SMP Wed Feb 17 21:35:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux)
The latest version of the Intel Graphics Drivers cannot be installed due to an issue with the GPG signature so I am waiting for this to be fixed to check if the newer driver would allow the 60fps for UHD on HMDI 2.0.
I have the same Mainboard (Asrock Fatal1ty Z170 Gaming-ITX/ac) and had quite some fight to get video out to work. With 4K@60Hz I have an unusable image (flickering, more blackscreen than actual content - unusable). I've now set res to 1080p and wait for driver improvements.
Do you get the 4K @30Hz on the HDMI2.0 or HDMI1.4 connector? Is it usable/flickerfree?
I think I had also trouble with 30Hz but don't remember and am away from my HTPC right now...
I'm curious because I cannot get anything on the HDMI 1.4 connector (above DP) - always "no signal" - even at 720p or lower. The connector only works until Grub. After that - nothing.
Well. seems like early adopters are forced to be patient sometimes...
Small Update from here:
I've discovered that enabling HDMI ULTRA HD DEEP COLOR Option on my LG TV makes xrandr list the 60Hz.
But: As long as that's enabled, I get 60Hz displayed, tv shows 60Hz input - but flickering destroys usability completely.
Interesting side-note: neither 30Hz nor 23,98Hz work in 4K resolution with the HDMI ULTRA HD DEEP COLOR setting enabled.
So I've the choice between 60Hz flickering and 30Hz - how ironic.