Flicker-free boot troubleshooting (dual boot)

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Hi :wave:, I am having some trouble getting a flicker-free boot on an X1C 8th gen. I still see a black screen in this order:

BIOS --> Grub --> OEM splash --> Black screen --> OEM splash + Fedora logo --> GDM

I am dual booting, but am on UEFI. Maybe there is some issue with dual booting? The ideal end goal is to hide Grub (unless shift is pressed) and have a seamless boot - not sure if this is possible though. Here’s my grub.conf:

GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT="saved"
#GRUB_DISABLE_SUBMENU="true"
GRUB_TERMINAL_OUTPUT="gfxterm"
GRUB_CMDLINE_LINUX="rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG="false"

There may be some issues regarding recent kernels and i915 support as this user has reported Intel i915 module's fastboot option not working in recent kernels / Newbie Corner / Arch Linux Forums.

If anyone could help I would be greatly appreciative! :heart_eyes:

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2

A followup:

Adding i915.fastboot=1 to the command line did nothing.

I found that adding nomodeset actually appears to disable the mode set happening, so there is no black screen. It looks smooth - though compared to the original boot the Fedora logo and spinner appear suddenly and much later after the OEM splash. I compared the two boot times with systemd-analyze and they were about equal.

Not sure this is the proper solution but there is something weird going on.

3

Again, even nomodeset has its own consequences, it seems that it really makes the display driver wonky all the way into the desktop session! I wouldn’t use it…