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Thread: HOWTO: Change bootup resolution

  1. #21
    Join Date
    Aug 2005
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    Ubuntu 8.04 Hardy Heron

    Re: HOWTO: Change bootup resolution

    I've got a Sony SDM-HS95 with 1280x1040, but it's weird and has a different refresh rate from any other LCD with 1280x1040. The refresh rates are:
    HorizSync 28.0 - 80.0
    VertRefresh 48.0 - 75.0

    So when I use the 795 decimal value for grub the monitor just shows a warning message. I also had trouble during installation unless I lowered the resolution. Does anyone know how to get the vga= values for those specific sepcs?

  2. #22
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    Re: HOWTO: Change bootup resolution

    For those who have resolutions not in the table, fear not, they may be available. To get them, first install hwinfo
    Code:
    sudo apt-get install hwinfo
    now run
    Code:
    sudo hwinfo --framebuffer | grep 'Mode '
    it'll spew out a bunch of lines like this: (Your numbers may be different)
    Code:
      Mode 0x0360: 1280x800 (+1280), 8 bits
      Mode 0x0361: 1280x800 (+2560), 16 bits
      Mode 0x0362: 1280x800 (+5120), 24 bits
      Mode 0x0305: 1024x768 (+1024), 8 bits
      Mode 0x0317: 1024x768 (+2048), 16 bits
      Mode 0x0318: 1024x768 (+4096), 24 bits
    ...
    Just use the Mode number you want after vga=. So, if you wanted 1280x800 and 24-bit color, you would use "vga=0x0362".
    "Whoever said sunshine brings happiness has never danced in the rain." - K. Jackson
    Exaile Media Player | Arch Linux
    Click here to have your brain eaten

  3. #23
    Join Date
    Aug 2005
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    Ubuntu 8.04 Hardy Heron

    Re: HOWTO: Change bootup resolution

    Quote Originally Posted by reacocard View Post
    For those who have resolutions not in the table, fear not, they may be available. To get them, first install hwinfo
    Code:
    sudo apt-get install hwinfo
    now run
    Code:
    sudo hwinfo --framebuffer | grep 'Mode '
    it'll spew out a bunch of lines like this: (Your numbers may be different)
    Code:
      Mode 0x0360: 1280x800 (+1280), 8 bits
      Mode 0x0361: 1280x800 (+2560), 16 bits
      Mode 0x0362: 1280x800 (+5120), 24 bits
      Mode 0x0305: 1024x768 (+1024), 8 bits
      Mode 0x0317: 1024x768 (+2048), 16 bits
      Mode 0x0318: 1024x768 (+4096), 24 bits
    ...
    Just use the Mode number you want after vga=. So, if you wanted 1280x800 and 24-bit color, you would use "vga=0x0362".
    It actually gives me the same values posted in the beginning of the thread.

  4. #24
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    Re: HOWTO: Change bootup resolution

    Quote Originally Posted by wh0rd View Post
    It actually gives me the same values posted in the beginning of the thread.
    Then those are the only modes your framebuffer supports. My tip is more applicable to those with widescreens, whose resolutions aren't part of the vesa spec.
    "Whoever said sunshine brings happiness has never danced in the rain." - K. Jackson
    Exaile Media Player | Arch Linux
    Click here to have your brain eaten

  5. #25
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    Ubuntu 7.10 Gutsy Gibbon

    Re: HOWTO: Change bootup resolution

    Hey, Edgy user here.
    I'm having a problem with my usplash. It's not serious, just a little annoying.
    When I first installed Edgy, both my startup and shutdown screens displayed at too high a resolution. My monitor displayed them both, but had this irritating box saying "Input Not Supported".
    I fixed my shutdown usplash by editing /etc/usplash.conf (a file, might I add, that is needlessly complex ), and I changed my startup resolution in the same way mentioned here, however according to this post, it should be displaying at a low resolution, which it's not, and that resolution should be used for my virtual consoles, which, again, it is not. My virtual consoles look about 800x600.
    Also, I'm getting the off-center issue when using this fix. Does anyone know how to change the resolution of the splash image, or even just its position on the screen?
    Last edited by coolen; January 29th, 2007 at 02:43 AM. Reason: Clarification

  6. #26
    Join Date
    May 2006
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    BELGIUM, Loppem
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    Distro
    Ubuntu 7.10 Gutsy Gibbon

    Re: HOWTO: Change bootup resolution

    @coolen You should start a new thread for that

  7. #27
    Join Date
    Jul 2006
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    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: HOWTO: Change bootup resolution

    I still can't get any resolution to work except for the default 680x480 (which uses only the center part of my laptop screen), no matter what vesa value I fill in (all give unsupported mode). X boots nicely into 1024x768 but console and startup remain in 680x480.

    I have read that one needs to enable framebuffering for the i810 (built in 4mb card), but have no idea how to do that (do I need to compile my own kernel?).

    (before people start posting links to things like i810fb, I looked and don't understand where what needs to be changed, let alone compiling a kernel with bits and pieces (or do I need to patch it?)) I am not useless at linux, but on this part I have no idea.
    Gnu is not a question.

  8. #28
    Join Date
    Mar 2007
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    3

    Re: HOWTO: Change bootup resolution

    I was able to change my bootup resolution to 1280x1024 but how do I change the refresh rate of the bootup resolution from 60Hz to 75Hz?

  9. #29
    Join Date
    Mar 2006
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    4

    Re: HOWTO: Change bootup resolution

    I'm using a 1600x1200 resolution.

    hwinfo gives me a maximal resolution of 1280x1024.
    Thats also the highest resolution i can use usplash with.

    Can anybody tell me what exactly hinders me from using a higher resolution?

    Jonas

  10. #30

    Re: HOWTO: Change bootup and console resolution

    Quote Originally Posted by Indras View Post
    Just a quick little update... here's the full table in easy to read (and easy to remember) decimal format.

    HTML Code:
    Colours   640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
    --------+--------------------------------------------------------------
     4 bits |    ?       ?      770       ?        ?        ?         ?
     8 bits |   768     769     771      773      353      775       796 
    15 bits |    ?      784     787      790      354      793       797 
    16 bits |    ?      758     788      791      355      794       798 
    24 bits |    ?      786     789      792       ?       795       799 
    32 bits |    ?       ?       ?        ?       356       ?


    I've also seen questions from people wanting widescreen resolutions. I'm sorry, but it seems that vesafb doesn't support any resolution not in the table above.

    There is a error. Mode 640x480@16b is 785.

    This is script to convert table (only nubmers):

    HTML Code:
    #!/bin/bash 
    
    while read LN ; do
    NEWLN=`echo $LN | sed s/?/0/`
    for NUMB in $NEWLN ; do
    let x=0 ; let x=$NUMB 2>/dev/null
    echo -ne "\t$x"
    done
    
    echo -ne "\n"
    
    done


    Usage example:
    HTML Code:
    valentin@darkstar:~/lab$ cat tbl1
    Colours   640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
    --------+--------------------------------------------------------------
     4 bits |    ?       ?     0x302      ?        ?        ?         ?
     8 bits |  0x300   0x301   0x303    0x305    0x161    0x307     0x31C
    15 bits |    ?     0x310   0x313    0x316    0x162    0x319     0x31D
    16 bits |    ?     0x311   0x314    0x317    0x163    0x31A     0x31E
    24 bits |    ?     0x312   0x315    0x318      ?      0x31B     0x31F
    32 bits |    ?       ?       ?        ?      0x164      ?         ?
    
    valentin@darkstar:~/lab$ cat tbl1  | convert_hex_table_to_dec.bash
            0       0       0       0       0       0       0       0
            0
            4       0       0       0       0       770     0       0       0       0
            8       0       0       768     769     771     773     353     775     796
            15      0       0       0       784     787     790     354     793     797
            16      0       0       0       785     788     791     355     794     798
            24      0       0       0       786     789     792     0       795     799
            32      0       0       0       0       0       0       356     0       0
    
    valentin@darkstar:~/lab$    
    
    valentin@darkstar:~/lab$ cat tbl2
    Colours   640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
     4bits      ?       ?     0x302      ?        ?        ?         ?
     8bits    0x300   0x301   0x303    0x305    0x161    0x307     0x31C
    15bits      ?     0x310   0x313    0x316    0x162    0x319     0x31D
    16bits      ?     0x311   0x314    0x317    0x163    0x31A     0x31E
    24bits      ?     0x312   0x315    0x318      ?      0x31B     0x31F
    32bits      ?       ?       ?        ?      0x164      ?         ?
    
    valentin@darkstar:~/lab$ cat tbl2  | convert_hex_table_to_dec.bash
            0       0       0       0       0       0       0       0
            0       0       0       770     0       0       0       0
            0       768     769     771     773     353     775     796
            0       0       784     787     790     354     793     797
            0       0       785     788     791     355     794     798
            0       0       786     789     792     0       795     799
            0       0       0       0       0       356     0       0
    
    valentin@darkstar:~/lab$     


    The result is:
    HTML Code:
     Colours  640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
     ----------------------------------------------------------------------
      4 bits     -       -      770       -        -        -         -
      8 bits    768     769     771      773      353      775       796
     15 bits     -      784     787      790      354      793       797
     16 bits     -      785     788      791      355      794       798
     24 bits     -      786     789      792       -       795       799
     32 bits     -       -       -        -       356       -         -

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