[Bug 93523] [IVB] laptop display eDP1 UEFI boots to letterboxed 16:9 display instead of full screen 16:10 2560x1600 (Macbook 13 retina)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93523

--- Comment #2 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
This bug only occurs on UEFI grub boot. On a BIOS boot (grub --target=i386-pc)
with the same kernel the VESA BIOS mode 2560x1600 is available and will be used
by grub so the aspect ratio is always 16:10. On a UEFI boot, the only mode grub
reports as being available is 1920x1080 (which is letterboxed 16:9 aspect
ratio) so it uses that and the kernel should properly switch to 16:10 aspect
ratio for 2560x1600 mode.

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