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Re: Failure to use 3840x2160 30hz with Intel 620 chipset

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On 7/12/21 10:11 AM, Felix Miata wrote:
> Felix Miata composed on 2021-07-10 18:29 (UTC-0400):
>
>> I only had a 4K display for 3 weeks 3 years ago, so it's hard for me to be very
>> helpful by trying to match behavior, or construct a configuration file free of
>> errors.
> 											
> I forgot something important to this thread. I got a broken 55" 4K LG TV
> for free 8 weeks ago. I spent $40US on parts to fix it.
>
> I just tried connecting it to a Kaby Lake Intel PC (HD 620, not UHD 620)
> via direct HDMI, along with an ordinary 1920x1080 Samsung HDTV via DisplayPort
> to HDMI adapter, using openSUSE 15.2. With only the LG connected, X opened up
> in 3840x2160@30 automatically. With both connected, both come up in 1920x1080@60.
> However, xrandr --output HDMI-2 --primary --mode 3840x2160 --output DP-1 --mode 1920x1080 --above HDMI-2
> worked a charm to set 3840x2160@30 on the LG and set the small Samsung above
> the big LG.
>
> Rebooting to Bullseye to try the same, I can't get the Samsung HDTV out of
> unsupported mode, even though xrandr reports the Samsung is using its native
> mode, or trying with any other supported mode selected. This smells like a
> Bullseye bug waiting to be reported.
>
> Next I tried openSUSE Tumbleweed. It works as expected there too:
> # xrandr --output HDMI-2 --primary --mode 3840x2160 --output DP-1 --mode 1920x1080 --above HDMI-2
> # xrandr | egrep 'onnect|creen|\*' | grep -v disconn | sort -r
> Screen 0: minimum 320 x 200, current 3840 x 3240, maximum 16384 x 16384
> HDMI-2 connected primary 3840x2160+0+1080 (normal left inverted right x axis y axis) 1600mm x 900mm
> DP-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 160mm x 90mm
>     3840x2160     30.00*   25.00    24.00    29.97    23.98
>     1920x1080     60.00*+  59.94    30.00    24.00    29.97    23.98
> # inxi -SGay
> System:
>    Host: ab250 Kernel: 5.12.9-1-default x86_64 bits: 64 compiler: gcc v: 11.1.1
>    parameters:...
>    Desktop: Trinity R14.0.10 tk: Qt 3.5.0 info: kicker wm: Twin 3.0 vt: 7
>    dm: TDM Distro: openSUSE Tumbleweed 20210611
> Graphics:
>    Device-1: Intel HD Graphics 630 vendor: ASUSTeK driver: i915 v: kernel
>    bus-ID: 00:02.0 chip-ID: 8086:5912 class-ID: 0300
>    Display: x11 server: X.Org 1.20.11 driver: loaded: modesetting
>    unloaded: fbdev,vesa alternate: intel display-ID: :0 screens: 1
>    Screen-1: 0 s-res: 3840x3240 s-dpi: 144 s-size: 678x572mm (26.7x22.5")
>    s-diag: 887mm (34.9")
>    Monitor-1: DP-1 res: 1920x1080 hz: 60 dpi: 305 size: 160x90mm (6.3x3.5")
>    diag: 184mm (7.2")
>    Monitor-2: HDMI-2 res: 3840x2160 hz: 30 dpi: 61
>    size: 1600x900mm (63.0x35.4") diag: 1836mm (72.3")
>    OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (KBL GT2)
>    v: 4.6 Mesa 21.1.2 compat-v: 3.0 direct render: Yes

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Thread

Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-08 23:00 +0200
  Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-08 23:10 +0200
    Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-08 23:40 +0200
      Re: Failure to use 3840x2160 30hz with Intel 620 chipset Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2021-07-09 00:40 +0200
      Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-09 09:10 +0200
        Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-10 02:20 +0200
          Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-10 23:10 +0200
            Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-11 00:40 +0200
              Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-12 07:30 +0200
              Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-12 10:20 +0200
                Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-16 08:40 +0200
                Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-16 08:40 +0200
                Re: Failure to use 3840x2160 30hz with Intel 620 chipset Felix Miata <mrmazda@earthlink.net> - 2021-07-16 10:00 +0200
                Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-16 12:10 +0200
              Re: Failure to use 3840x2160 30hz with Intel 620 chipset Pierre Couderc <pierre@couderc.eu> - 2021-07-17 08:20 +0200

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