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Boot-repair tool tells me Legacy mode compatibility (CSM) is turned off, but the ASUS bios tells me it's on

jm flag

After a mistake on my part during an Ubuntu reinstall, I lost my legacy windows boot.

I tried to get it back with boot-repair, who does see the windows session, but tell me to activate CSM. I did, and checked it was actually turned on on subsequent attempts, but the same warning messaged appeared in boot-repair:

-On my installed Ubuntu, it said that a legacy windows version was detected, and I should enable CSM and run boot-repair from a key, preventing me from running boot-repair,

-And on my live usb key (with a temporary install of boot-repair) it said that a legacy windows was detected, and I should enable CSM, but this time it was simply a warning and not a hard block.

I did run it from key (just in case), it was successful, but still no option to launch windows from the GRUB.

Any idea why boot-repair and the ASUS BIOS are disagreeing on the fact that CSM is on/off?

oldfred avatar
cn flag
How you boot USB flash drive is separate from the default boot setting in UEFI settings. In UEFI you typically get two entries for a flash drive UEFI:xxx and xxx where xxx is BIOS/CSM/Legacy boot mode. If you installed Ubuntu in UEFI mode you move boot flag from Windows boot partition to ESP and then Windows cannot boot. Post link to summary report that Boot-Repair makes as it suggests.
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