Does anyone use both display port with 4K monitors?

Discussion in 'UDOO X86' started by Wally.Yeh, Jul 25, 2017.

  1. Wally.Yeh

    Wally.Yeh New Member

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    Hi, Guys:
    I am now working on flat screen TV for advertising, so I need a tiny computer which has dual 3840x2160 support in linux.

    I think UDOO x86 may be a perfect solution. I do search the internet and this forum, but no one talk about it can support dual 3840x2060 or not.

    Any suggestion will be appreciated, thanks.
     
  2. Maurice

    Maurice Active Member

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    They always said (and the shop is still claiming it) that they can drive multiple 4K screens: "can drive up to three screens in 4K at the same time"

    I have it connected to a single HD screen, so I can't tell you if and what problems you'll run into if you want to have multiple 4K screen.
     
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  3. Wally.Yeh

    Wally.Yeh New Member

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    Thanks for sharing your DP experience with me. :)
    guess I'll need buy 1 and see if there are another issues or not.
     
  4. Markus Laire

    Markus Laire Active Member

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    btw, note that 4k refresh rate is only 30 Hz - UDOO X86 can't do 60 Hz.
     
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  5. Wally.Yeh

    Wally.Yeh New Member

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    that's also important information, thanks!
     
  6. Maurice

    Maurice Active Member

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  7. Wally.Yeh

    Wally.Yeh New Member

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  8. Wally.Yeh

    Wally.Yeh New Member

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    good news is that UDOO X86 basic support dual 4k@30Hz.
    bad news is it can't output single 2k(2560x1440) on 4k monitors.
    I just use "xrandr --output DP2 --mode 2560x1440" on 4K monitor, the screen turns black.
    Need to use "xrandr --output DP2 --mode 3840x2160" to get my screen back.

    My linux distro is Ubuntu 16.04; does anyone know how to solve this issue?
     
  9. waltervl

    waltervl UDOOer

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  10. Wally.Yeh

    Wally.Yeh New Member

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    @waltervl : Thanks for reply this information. :D I haven't try that yet, I'll reply the result ASAP.
     
  11. Wally.Yeh

    Wally.Yeh New Member

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    Thanks @waltervl 's help! now 2560x1440 works great. :)

    I found that Intel Graphics Update Tools is currently V2.0.6(only work in Ubuntu 17.04):
    https://01.org/zh/node/10128

    I re-install with Ubuntu 17.04 and use this tool, 2K resolution on my 4K monitors finally works now.
     
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  12. Wally.Yeh

    Wally.Yeh New Member

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    Sorry for some wrong information, I find out that my working 2K resolutions on DisplayPort is "2048x1080" not "2560x1440";
    2560x1440 still get me blank screen on DisplayPort , but it works fine if using HDMI instead.
    Windows seems fine on both HDMI & DisplayPort.

    Someone had reported this issue: https://bugs.freedesktop.org/show_bug.cgi?id=97031

    Let's hope intel-dev will solve this issue soon. :(
     
  13. Wally.Yeh

    Wally.Yeh New Member

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    Although official fix not ready, for someone urged to use 2560x1440 on DisplayPort may use "xrandr --newmode" for workaround:
    gtf 2560 1440 60
    # 2560x1440 @ 60.00 Hz (GTF) hsync: 89.40 kHz; pclk: 311.83 MHz
    Modeline "2560x1440_60.00" 311.83 2560 2744 3024 3488 1440 1441 1444 1490 -HSync +Vsync

    xrandr --newmode "2560x1440_60.00" 311.83 2560 2744 3024 3488 1440 1441 1444 1490 -HSync +Vsync
    xrandr --addmode DP2 "2560x1440_60.00"
    xradr --output DP2 --mode "2560x1440_60.00"

    if previous setting still failed, try "gtf 2560 1440 50" or "gtf 2560 1440 30" for instead, these two settings works for me.
     
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