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Thread: Grub2 Console VGA Modes in Yast

  1. #1
    Join Date
    Dec 2008
    Location
    Norway
    Posts
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    Default Grub2 Console VGA Modes in Yast

    Using Yast to configure the bootloader Grub2.

    The list of VGA modes contains only these LOW screen resolutions.
    320x200 320x240 320x400 640x400 640x480 800x600
    8bit 0x330 0x334 0x331 0x300 0x301 0x303
    16bit 0x30e 0x335 0x332 0x33d 0x311 0x314
    24bit 0x30f 0x336 0x333 0x33e 0x312 0x315

    Taken these VGA modes from OpenSUSE documentation
    https://activedoc.opensuse.org/book/...t-loader-grub2
    640x480 800x600 1024x768 1280x1024 1600x1200
    8bit 0x301 0x303 0x305 0x307 0x31C
    16bit 0x311 0x314 0x317 0x31A 0x31E
    24bit 0x312 0x315 0x318 0x31B 0x31F

    Are there not any higher resolutions than 1600x1200x24 in VGA Mode? Why am I not getting these higher resolution vga modes in Yast bootloader configuration?

    Setting VGA mode to 0x31F gives me a better console resolution: I have to write the Hex only, because writing "1600x1200, 24bits (modus 0x31F)" does not work.
    GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/disk/by-id/ata-WDC_WD1500HLFS-01G6U0_WD-WXLY08136254-part1 quiet showopts vga=0x31F"
    GRUB_TERMINAL=gfxterm
    GRUB_GFXMODE=2560x1440x32

    Output from vbeinfo in Grub command line:
    Code:
    VESA BIOS Extension Video Driver
    VBE Version 3.0
    ...
     x 0x14d 2560x1440x32 (10240) Direct Color, mask: 8/8/8/8, pos: 16/8/0/24


    OpenSUSE 13.1
    NVidia GeForce 650Ti
    Nvidia graphics driver 331.67 (installed via RPM repository)
    Monitor resolution: 2560x1440

  2. #2
    Join Date
    Nov 2009
    Location
    West Virginia Sector 13
    Posts
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    Default Re: Grub2 Console VGA Modes in Yast

    Don't think vga is defined above 1600x1200

    Looking it up I see that 1600x1200 is actually UXGA which I guess is a VGA based standard

    http://en.wikipedia.org/wiki/File:Ve...Standards2.svg

    Yast shows higher res on my machine maybe the problem is with the handshake with your video card.

  3. #3
    Join Date
    Dec 2008
    Location
    Norway
    Posts
    550

    Default Re: Grub2 Console VGA Modes in Yast

    Could you elaborate on this handshake? Is there somehow I can check if this is the problem and possibly correct it?

  4. #4
    Join Date
    Nov 2009
    Location
    West Virginia Sector 13
    Posts
    15,798

    Default Re: Grub2 Console VGA Modes in Yast

    For some reason the driver is not reporting all the options. So they are not getting listed. Note that the driver at the boot is not the NVIDIA driver which is loaded later. I think it may be using the BIOS video. So maybe the monitor is not hand shaking with the software Why not just try a higher res entry and see if it works. even if the monitor can't be read at grub it should still boot

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