Date: 2012-11-16 01:01 pm (UTC)
From: (Anonymous)
I have a Lenovo W520, and what seems to be happening is that the firmware will ONLY boot the file "/EFI/Boot/bootx64.efi" on the EFI System Partition. It doesn't seem to matter what description you give it, if you rename your .efi boot manager to that exact location and filename, and if the system is set to UEFI boot, it will boot that manager. I've installed rEFInd boot manager and Grub2 boot manager in that location (renaming the .efi files) and both work fine. From rEFInd you can easily boot Windows or Linux .efi files if you put them in the right places for rEFInd to find. The Grub2 was installed by Ubuntu 12.10, which is UEFI and SecureBoot aware. However, Lenovo's firmware didn't like the location Ubuntu had put the file, so it wouldn't boot. Renaming it /EFI/Boot/bootx64.efi works perfectly. Note you have to make sure the disk containing the EFI partition is higher in priority order than any other disk that might boot for it to work automatically.

I'm not saying a string check isn't happening, but the location listed above seems to override any string check.
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Google. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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