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Thread: Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

  1. #1
    Join Date
    Apr 2022
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    7

    Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

    I am trying to install Ubuntu Server 20.04.4 LTS (No X Server, no GUI) on my Intel NUC. My HDMI output is redirected to a video capture card (if that matters) which supports 4k display which feeds video into my laptop.
    The problem is that when I start the installer it looks like this:
    https://i.stack.imgur.com/lRsXk.png
    Basically it's just too small for my eyes.
    I need to install Ubuntu Server with HWE kernel as this is supporting my wifi card and by pressing 'e' and I'm presenting with this screen:
    https://i.stack.imgur.com/4r4Cr.png
    I tried here changing:

    set gfxpayload=1024x768x32

    and the pressing F10 to boot but it didn't had any effect.
    What can I do to lower the screen resolution?

    videoinfo output

    Adapter 'EFI GOP driver':
    * 0x000 3840 x 2160 x 32 (15360) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0x001 640 x 480 x 32 (2560) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0x002 800 x 600 × 32 (3200) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0x003 1024 x 768 x 32 (4096) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0×004 1280 × 1024 x 32 (5120) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0x005 1600 x 1200 x 32 (6400) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    0x006 1920 x 1440 x 32 (7680) Direct color, mask: 8/8/8/8 pos: 16/8/0/24
    EDID version: 1.3
    Preferred mode: 3840x2160
    Last edited by codrut-popescu; April 16th, 2022 at 09:19 AM.

  2. #2
    Join Date
    May 2010
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    3,367

    Re: Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

    Did you try without the "x32" on the end?

  3. #3
    Join Date
    Apr 2022
    Beans
    7

    Re: Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

    It doesn’t make any difference

  4. #4
    Join Date
    Apr 2022
    Beans
    7

    Re: Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

    With Ubuntu installed I can see in the dmesg -T output that it's switching to efifb
    I don't know how to see the log file for the installer. Anyway, if anyone can solve this mystery, please help! How can I control the resolution for both the Ubuntu Server installer and the OS itself after being installed?


    Here is the dmesg output:
    https://paste.ubuntu.com/p/ypmmwz2PKn/

    What's interesting is this:

    [Sat Apr 16 13:20:21 2022] efifb: probing for efifb
    [Sat Apr 16 13:20:21 2022] efifb: framebuffer at 0x4000000000, using 32400k, total 32400k
    [Sat Apr 16 13:20:21 2022] efifb: mode is 3840x2160x32, linelength=15360, pages=1
    [Sat Apr 16 13:20:21 2022] efifb: scrolling: redraw
    [Sat Apr 16 13:20:21 2022] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
    [Sat Apr 16 13:20:21 2022] Console: switching to colour frame buffer device 240x67
    [Sat Apr 16 13:20:21 2022] fb0: EFI VGA frame buffer device
    [Sat Apr 16 13:20:21 2022] Monitor-Mwait will be used to enter C-1 state
    [Sat Apr 16 13:20:21 2022] Monitor-Mwait will be used to enter C-2 state
    [Sat Apr 16 13:20:21 2022] Monitor-Mwait will be used to enter C-3 state

    Maybe someone knows how to control the resolution of the efifb in both the Ubuntu Server installer and the OS after being installed

  5. #5
    Join Date
    Apr 2022
    Beans
    7

    Re: Cannot change the installer screen resolution for Ubuntu Server 20.04 LTS

    The solution was found, apparently, in some Raspberry Pi forums. After all the Intel NUC is just a more powerful RPi.
    I have added:
    video=HDMI-A-1:1920x1080M@60
    as a parameter to the kernel as seen in the picture:
    https://imgur.com/a/YvI1pNl
    and the screen resolution is now much better:
    https://imgur.com/a/Q5VIuGp

    Now, I don't know what exactly:
    video=HDMI-A-1:1920x1080M@60
    means. Why HDMI-A-1 and what is M in 1080M. But it works.

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