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grub: gfxmode

 
 15.1.12 gfxmode
 ---------------
 
 If this variable is set, it sets the resolution used on the 'gfxterm'
 graphical terminal.  Note that you can only use modes which your
 graphics card supports via VESA BIOS Extensions (VBE), so for example
 native LCD panel resolutions may not be available.  The default is
 'auto', which selects a platform-specific default that should look
 reasonable.  Supported modes can be listed by 'videoinfo' command in
 GRUB.
 
    The resolution may be specified as a sequence of one or more modes,
 separated by commas (',') or semicolons (';'); each will be tried in
 turn until one is found.  Each mode should be either 'auto',
 'WIDTHxHEIGHT', or 'WIDTHxHEIGHTxDEPTH'.
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