Well...
My story was convoluted but can be easily summarized:
Mint crapped out om HDMI.
The OSS drivers work OK in Kubuntu
And...
I got a different TV set and worked right ot of the box.
55 inches.
Loving it... :)
ET
Michael Butash writes:
So not sure how you ended up here, but I've been doing research, and
finally pulled the trigger on my desktop upgrade with 3x 4k monitors that
sadly all only come with hdmi ports vs. displayport natively.
RE: cables, I ended up getting pretty generic, but well rated, amazon
"hdmi 2.0 compatible" cables, and so far no issues (I thought perhaps, but
more on that later). Now, to adapt to DisplayPort...
Since almost no affordable video cards have hdmi 2.0, and especially not
in any quantity, some research yielded a bit ago club3d, maker of various
adapters, made hdmi 2.0 to displayport 1.2 adapters that could do full
4:4:4 chroma. A buddy got one as a test with his Sekei 4k/30hz tv, but it
only did 4:4:2 anyways, but worked well to at least to that spec.
My desktop prior was driving 6x 24" 1080 displays on an asus/amd 7970
matrix card with 4x DP ports, plus 2x dvi. I ran my 6 just dandy at full
11520x1200 res, now replacing with 3x 48" 4k samsung tv's to do in theory
full 4:4:4 at 60hz.
Does it work? Yes, fantastically after some tweaking. I'm using 3x DP
ports off the same 7970 card to drive the club3d adapters, to HDMI to the
TV's. It was mostly plug and play, I instantly plugged in and saw a 4k
display window. Adding 2 more went just as well, never rebooting.
So there are a few issues, such as I haven't figured out how to coax it to
do full 60hz, but I think I found out the issue, just haven't reset some
things. Not shabby for a 5-6yr old card, so don't believe the hype you
need an nvidia 970 card to drive 4k, you just need something with the
total framebuffer support. AMD is great about this.
Another weird issue, that I totally thought was a physical issue for a
while, was apparently stupid amd drivers, again. I kept getting this odd
little wobbling effect in parts of the screens, and occasionally across
the entire tv until I moved the res around some in the amd control panel.
I kept swapping cables, adapters, and found no reasonable pattern, which
lead me to just again crap amd drivers. After some pain to upgrade,
downgrade, and eventually abandon the damn blob drivers and go with the
OSS Radeon drivers. Holy crap, they work, and better than the AMD ever
did, and all wobble/fragment/distortion is gone!
The amd drivers worked, but very choppy when moving a big/busy window in
kde, with compositing off already by default on mine. Enabling compositing
drove it to a good 10sec lag in seeing a refresh. After moving to radeon,
I've enabled full compositing across the full 11520x2160 framebuffer, with
full wiggly effects and everything under kwin, and it's literally and
beautifully perfect. GL games seem to work fine too, at full res for mega
3-head gaming.
My only remaining issue is apparently there is a long-standing bug in 4.x
that the display configuration widget doesn't save and restore the display
settings for multi-monitors. It's a bit cranky when messing with it,
occasionally causing kwin to glitch, forcing me to drop to another tty and
restart the session. I wrote for now a script to setup xrandr after
startup to move the displays about that seems to work until I figure out a
better way.
So 4k *does* work, or at least can, but seems mostly up to drivers, and
oddly, the tv settings as well. First thing I did was set mine to "gaming
mode", to lower the input latency, but apparently this has ramifications
that it doesn't allow full 4:4:4 chroma color if doing so. I think this
might be limiting my 60hz too, but not sure. TBD.
Side note, I might go nvidia now that I'm down to 3x ports again, I just
need to go gtx960 or higher. Can't be worse than my 3x pci slot matrix
card, other than cost, and hoping nvidia drivers are less buggy. Then
again, with radeon drivers, I might not have to now.
-mb
On 03/16/2016 10:54 AM, [email protected] wrote:
In my infinite wisdom, I bought yesterday a laptop (Asus ROG GL752VW) and
a 4K TV to use as a monitor.
Stupid Windows 10 would not detect HDMI.
OK, screw it, I'm going to dual-boot the thing anyway.
Well, latest-and-greatest Linux Mint (KDE) doesn't detect the HDMI
either... :(
So...
I bought a 'mini display port-to-VGA' adapter and plugged it VGA into the
TV. It works, but I only get the same laptop resolution (1920x1080)
...
8-(
So...
Questions are:
1.- Can I expect my full 4K resolution if I get the #$@! HDMI working?
and
2.- What can I do to get the #$@! HDMI working?
Thanks!
ET
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