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Change the definition of the screen at startup

After you have installed Dapper, it may be necessary to change the screen resolution used at system startup (sequence during which the Ubuntu logo appears). This definition is chosen in the home screen of the CD-ROM (CD Desktop) via the [F4] and then used at every boot.
For newer versions of Ubuntu, you can get higher resolutions using framebuffer .

Technical details

When a screen resolution has been selected by pressing [F4] on the home screen of the Desktop CD (before installation), the parameter "vga" is saved in the file "/ boot / grub / menu.lst "and then passed to the kernel at startup. This parameter accepts different types of codes to indicate the chosen definition.
Further, a non-exhaustive table summarizing the codes found on various websites ...

Code table for the parameter "vga"

There are two types of codes - decimal or hexadecimal - one that can be passed as the other via the kernel parameter "vga".
Use 'hwinfo' to identify the modes supported by your graphics card:
  $ Sudo aptitude install hwinfo
 $ Sudo hwinfo - framebuffer 
Or use the following table (note that some values ​​in the table seem to vary according to the graphics card):
Definition 8-bit display 16-bit display 24-bit display
Size Name Ratio decimal hex. decimal hex. decimal hex.
640 × 480 VGA 1.33 769 0x301 785 0x311 786 0x312
800 × 600 SVGA 1.33 771 0x303 788 0x314 789 0x315
1024 × 768 XGA 1.33 773 0x305 791 0x317 792 0x318
1152 × 864 XGA + 1.33 353? 0x161 355? 0x163 356? 0x164
1400 × 1050 SXGA + 1.33 839? 0x347? 834 0x342 835 0x343
1600 × 1200 UXGA 1.33 796 0x31C 798 0x31E 799 0x31f
2048 × 1536 QXGA 1.33 ? ? ? ? 850? 0x352?
3200 × 2400 QUXGA 1.33 ? ? ? ? ? ?
640 × 400 ? 1.60 ? ? 829 0x33D 830 0x33E
1280 × 800 WXGA 1.60 867 0x363 868 0x364 869 0x365
1440 × 900 WXGA + 1.60 864 0x360 866 0x362 867 0x363
1680 × 1050 WSXGA + 1.60 872? 0x368? ? ? 873 0x369
1920 × 1200 WUXGA 1.60 892? 0x37c? ? ? 893? 0x37d?
1280 × 1024 SXGA 1.25 775 0x307 794 0x31A 795 0x31B
2560 × 2048 QSXGA 1.25 ? ? ? ? ? ?
1280 × 720 WXGA 1.77 ? ? ? ? ? 0x037b
1600 × 1024 WSXGA 1.56 ? ? ? ? ? ?
Code 836 (0x344) seems to be used for 32-bit.
A page full of codes VESA is available here (in English).

Change the code

To change the code currently in use on your system, open the file "/ boot / grub / menu.lst" with your favorite editor.
  gksudo gedit / boot / grub / menu.lst 
Then in the bottom of the file, locate the line that begins with one of the following ways:
  # # Eg DefOptions = vga =???  resume = / dev/hda5
   = Quiet splash # DefOptions 
Where "??? "Represents the current definition of the startup screen. Examples: vga = 792 or vga = 0x318
If no mention of the parameter "vga" is made in the second line, you can always add, for example like this:
  # DefOptions = quiet splash vga =??? 
When the file "/ boot / grub / menu.lst" has been changed, use the command "update-grub" to apply the changes. This command is not required under Edgy Eft and later.
Home (Ubuntu 8.04), this command is necessary.
  sudo update-grub 

Contributors: Lokx and contributors Ubuntu-fr .

installation / definition_demarrage.txt · Last Modified: 28.02.2011, 21:04 by Wenzel

http://doc.ubuntu-fr.org/installation/definition_demarrage

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