Posts by Madelaide

[SOLVED] UHD / 4K support from NUC using Mini Display Port (mini DP)

Over a year later, trying again to fix this problem again I stumbled across this post--> [NUC5i5MYHE don't recognize automatically my LG ... |Intel Communities] and the user "Whamsday" was correct. Full credit to them.

In summary, the NUC must have "legacy boot support" disabled.

This required a reinstall because my extant SSD was not seen by the UEFI boot.

1. Disable legacy boot support, confirm UEFI boot support is enabled
2. Reinstall from libreelec USB stick
3. boot, using DP, 4K resolutions are now available (23.98/24/25/29.x/30),
4. finally, yay (without having to boot with one DP to HDMI dongle (belkin from the apple store FYI), then hotswap to another which oddly seemed to enable 4k, but not on a cold boot)!
5. Now my photos on slideshow look awesome in 4K

*edit typos

Quote from twarkie

My TV (Samsung 55" KS9000) supports 60Hz in full resolution, but it's only possible if you have HDMI 2.0 or DP 1.2 which is still pretty rare for HTPCs. Older HDMI ports will only handle 30Hz which, as you say, feels very sluggish.

Unfortunately 2160p over DP broke when going from 7.0.3 to 7.90+; there is a bug thread here -> thread-2753.html?highlight=2160p

Quote from lrusak

Looks like it will only work via hdmi at max 30hz

With 7.90 yes, with 7.03, and OE before it, it worked at 4k fine for over a year.

7.90 is a regression in this feature I believe.

HDMI connected - 2160p an option, but does not work well on HDMI
LibreELEC (community) Version: 7.90.010
LibreELEC:~ # xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected primary (normal left inverted right x axis y axis)
HDMI1 connected
1920x1080+0+0 (normal left inverted right x axis y axis) 1440mm x 810mm
1920x1080 60.00 + 50.00 59.94 30.00 24.00 29.97 23.98*
4096x2160 24.00 23.98
3840x2160 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1152x864 75.00
1280x720 60.00 50.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

power off, DP1 connected, power on - 2160p not an option (but used to be on previous LE)
LibreELEC (community) Version: 7.90.010
LibreELEC:~ # xrandrScreen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected primary (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected
1920x1080+0+0 (normal left inverted right x axis y axis) 1440mm x 810mm
1920x1080 60.00*+ 50.00 59.94 30.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1152x864 75.00
1280x720 60.00 50.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

EDIT:formatting
[hr]
added --prop flag

LibreELEC:~ # xrandr --prop
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected primary (normal left inverted right x axis y axis)
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235, Video 16:235 pass-through
audio: auto
supported: force-dvi, off, auto, on
HDMI1 disconnected (normal left inverted right x axis y axis)
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235, Video 16:235 pass-through
audio: auto
supported: force-dvi, off, auto, on
HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1440mm x 810mm
EDID:
00ffffffffffff004dd9034201010101
01180103809051780a0dc9a057479827
12484c2108008180a9c0714fb3000101
010101010101023a801871382d40582c
45009f295300001e011d007251d01e20
6e2855009f295300001e000000fc0053
4f4e5920545620202a30370a000000fd
00303e0e460f000a202020202020018e
02034df0571f101405130420223c3e12
16030711150206015d5e5f62260d0707
150750830f000078030c001000b83c2f
d08a010203040140007f203070809076
e200fbe305df01e50e60616566023a80
d072382d40102c45809f295300001e01
1d00bc52d01e20b82855409f29530000
1e000000000000000000000000000023
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Video 16:235 pass-through
supported: Automatic, Full, Limited 16:235, Video 16:235 pass-through
audio: auto
supported: force-dvi, off, auto, on
1920x1080 60.00*+ 50.00 59.94 30.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1152x864 75.00
1280x720 60.00 50.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Quote from osxanalyst

after swapping to a straight HDMI cable it works. no need to manually code. somehow LE didnt like my mini DP - HDMI pup cable, while OE had no problems with it.

still have major lag issues though (also on OE). Would love to make this work, but thinking my NUC is underpowered.

I have this same problem, Intel NUC i5, Haswell. OE and LE 7 worked well with the mini display port DP1 in 4k/ 2160p; in fact, if I used HDMI, the resolution was selectable, but the screen would flash off at about 1Hz in 2160p/30. In 4K it was fine at any refresh rate. And, for the record, both my NUC i3 and i5 used to play 4k content at full rate, with no stutter/issues at all.

Unfortunately the LE8 (beta) does not see the DP1 port resolutions at 4K - i thought it might have been because I was loading the new OE image into "Updates" and something in my old config was stopping it; so over the Christmas break I wiped the install and loaded a fresh copy. Unfortunately this made no difference. So I'm back to 2k.

I use 4K because my screensaver is the picture slideshow and our photos are well above 4K so the higher resolution of 4K (over 2K) is very noticeable; not to mention photos look great in large (tv) size in high resolution compared to viewing on a small monitor.

I am not near my NUCs at the moment, but I can dump an xrandr when connected to HDMI1, and DP1 tonight if that helps.