I have a GTX 1060 GPU, a ultrawide (21:9) 2560x1080 monitor and a MSI B-450 A PRO motherboard (bios version V10.C - 2019/11/12).
最近，我将BIOS的启动模式从CSM更改为UEFI。 此后，我的grub开始使用显示器分辨率（2560x1080），然后才仅支持不超过1920x1080。
进行此更改后，grub的速度非常慢，达到了我可以看到屏幕呈现蜂鸣的程度，并且我必须注意不要在grub外壳中键入太快（甚至不是中等速度），否则会错过按键操作。
我的/ etc / default / grub具有以下内容：
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT="saved"
GRUB_TIMEOUT="4"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvme_core.default_ps_max_latency_us=0"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE="2560x1080x32"
GRUB_GFXPAYLOAD_LINUX="keep"
#GRUB_VIDEO_BACKEND="efi_gop"
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_SAVEDEFAULT="true"
GRUB_THEME="/usr/share/grub/themes/Stylish/theme.txt"
有谁知道发生了什么，以及如何解决？
