Bug 98333

Is the issue that a 60 hz mode is not available or that a 60 hz mode does not work?  Please attach your xorg log, dmesg output and xrandr output.  You may need this drm patch:
https://lists.freedesktop.org/archives/dri-devel/2016-May/107463.html

I don't have the same monitor but I don't have any problem lighting up with HDMI 2.0 4k 60Hz with Alex's amd-staging-4.7 and the commit from a week ago:

commit 4fa58023f62a95e93f82a25cdceb87b19b69b27f
Author: Christian König <christian.koenig@amd.com>
Date:   Mon Oct 17 15:34:07 2016 +0200

    reservation: revert "wait only with non-zero timeout specified (v3)"
    
    This reverts commit fb8b7d2b9d80e1e71f379e57355936bd2b024be9.
    
    Otherwise signaling might never be activated on the fences. This can
    result in infinite waiting with hardware which has unreliable interrupts.
    
    Signed-off-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

If you still see this issue please attach xorg log, dmesg and xrandr output, as Alex suggested.

Created attachment 127712 [details]
xrandr, dmesg, and xorg logs

Thanks for responding to my ticket! Sorry, I didn't have time to record down all the relevant information until recently.

Anyway, the 60 Hz mode is missing completely. I attached the relevant logs to the ticket.

I tried updating my clone of the kernel repo up to the commit at the end of this post, but the issue persists. I will try the suggested patch and respond as to whether or not it makes a difference for me.

Thanks again!

commit 019b84cce0585498430215503a50633d2d6a7fc8
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Wed Oct 26 16:41:39 2016 -0400

    drm/amdgpu: add support for new smc firmware on tonga
    
    Newer tonga parts require new smc firmware.
    
    Reviewed-by: Eric Huang <JinHuiEric.Huang@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org

Just tried the patch. That added a 60 Hz mode back in, but when I try to switch to it, I get no signal.

I can post logs if relevant.

Here is my output now from xrandr:

Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 878mm x 485mm
   3840x2160     30.00*+  59.94    59.88    24.00    29.97    23.98    29.94    23.95  
   4096x2160     59.94    59.88    24.00    29.97    23.98    29.94    23.95  
   1920x1200     30.00  
   1920x1080    120.04   120.00   119.88    60.00    59.94    24.00    23.98  
   1600x1200     30.00  
   1680x1050     30.00  
   1280x1024     30.00  
   1440x900      30.00  
   1280x800      30.00  
   1280x720      60.00    59.94  
   1024x768      30.00  
   800x600       30.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94

I was reminded today that this TV is a bit strange in that 4K @ 60 Hz only works with 4:2:0 chroma, while the common expectation would perhaps be 4:4:4. Perhaps that can help lead to a solution?

The NVidia ticket suggests this might be an EDID issue, with the display saying that it supports 4:2:2 at 4K/60 Hz when in fact it only supports 4:2:0.

Or could have been an NVidia driver bug that caused problems when modes for both 4:2:2 and 4:2:0 were available, hard to say. Anyways, seems like if we can get the driver to try 4:2:0 (possibly ignoring the monitor to do so) then it should work at 60 Hz.

Created attachment 128745 [details]
dmesg log

Hey i got the exact same issue with a Samsung HU7505 4k60 television using amdgpu on xubuntu 16.04.1/16.10, amdgpu-pro-16.50-362463 drivers work in 4k60 until the display is turned off and then it gives "mode not supported"


both the bios and the edid from the display while on crimson 16.12
https://f001.backblazeb2.com/file/nwgat-cdn/misc/xfx-rx460-Baffin-bios.rom
https://f001.backblazeb2.com/file/nwgat-cdn/misc/samsung_uhd_colour_YCbCr444-4k60_edid.bin

amd-staging-4.7 kernel, made no difference (git pull today)
ubuntu 4.10 from kernel.ubuntu.com/~kernel-ppa/mainline/v4.10-rc2/

might also be related to black screen on 4k60 issue i have on windows 
https://www.reddit.com/r/Amd/comments/5fyy7c/december_tech_support_megathread/dbwa536/?context=3

System Configuration:
Motherboard: FM2A88X-ITX+ AMD A88X
CPU: AMD A10-7800
Memory: 16GB DDR3
GPU: XFX RX 460 2GB (RX-460P2SFG5)
GPU-Z Report: https://www.techpowerup.com/gpuz/details/4qq9n
VBIOS: 015.050.000.000.000000
Driver: amdgpu
OS: xubuntu 16.04.1 LTS AMD64 or 16.10 AMD64
Display: Samsung UE55HU7505 55" UltraHD (in UHD Colour Mode)
Display Cable: Startech Pro Series Metal High Speed HDMI Cable 2M (HDPSMM2M)

from samsung manual
http://downloadcenter.samsung.com/content/UM/201411/20141127124859330/[ENG]NUDVBEUH-1.111-1015.pdf

CEA-861
3840x2160 50Hz 112.500 50.000 594.000 +/+
3840x2160 60Hz 135.000 60.000 594.000 +/+
4096x2160 50Hz 112.500 50.000 594.000 +/+
4096x2160 60Hz 135.000 60.000 594.000 +/+

Created attachment 128746 [details]
xorg log

Created attachment 128747 [details]
xrandr

Created attachment 128748 [details]
amdgpu-pro-dmesg

Created attachment 128749 [details]
amdgpu-pro-xorg.log

Created attachment 128750 [details]
amdgpu-pro-xrandr.log

(In reply to wiak from comment #9)
> Hey i got the exact same issue with a Samsung HU7505 4k60 television using
> amdgpu on xubuntu 16.04.1/16.10, amdgpu-pro-16.50-362463 drivers work in
> 4k60 until the display is turned off and then it gives "mode not supported"
> 

 On pro it might be just DPMS on/off issue or some monitors (this is actually TV where DPMS is usually off by default) or specific issues/customizations like:

 "Samsung offers a new user-accessible control called [HDMI UHD Color] on its 2014 range of UHDTVs. Instead of expanding the TV’s gamut to fulfil Rec.2020 colour space (we wished), it serves to provide support for up to 4:4:4 chroma resolution with 4K@60p/50p sources, indicating that the 55HU7500′s onboard HDMI 2.0 chip is a full-bandwidth, Level A version. [HDMI UHD Color] has to be enabled manually for each HDMI port where 4K res with 4:2:2 or 4:4:4 reproduction is required, because the chroma information is not auto-detected by the chip Samsung is using."

 http://www.hdtvtest.co.uk/news/ue55hu7500-201405083761.htm

I am experiencing the same 4K @ 30Hz limit with my RX460 and LG 27UD88-W monitor via a Highspeed HDMI cable. I have enabled HDMI DeepColour on the monitor, needed for the monitor to advertise 4K @ 60Hz.

Kernel is stock 4.9.11 on ElementaryOS (Ubuntu 16.04) with the HWE stack.

Created attachment 129853 [details]
xrandr + Xorg.0.log + dmesg

If the modes are only in the CEA extension block then this is a core drm issue.  The core EDID parser does not handles all of the CEA 4K modes yet.  Patches were proposed by several people, but I don't think any of them have gone upstream yet due to various objections and bikeshedding.  See:
https://lists.freedesktop.org/archives/dri-devel/2016-May/107463.html
https://lists.freedesktop.org/archives/dri-devel/2016-October/121434.html
https://lists.freedesktop.org/archives/dri-devel/2016-November/122631.html

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