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From: Scott Talbert <>
Subject: Boot regression in 4.8 for Mac Pro server
Date: Wed, 11 Sep 2019 16:42:58 -0400 (EDT)
Message-ID: <> (raw)


I just recently discovered a boot regression that occurred starting in 4.8 
on a Mac Pro Mid-2012 server (MacPro5,1).  Yes, I realize this problem is 
over 3 years old.  Obviously, I haven't been using Linux on this hardware 
in a while.  :-)  I bisected the regression to 
475fb4e8b2f4444d1d7b406ff3a7d21bc89a1e6f "efi / ACPI: load SSTDs from EFI 
variables".  And indeed, v5.3-rc7 will boot if I comment out the 
efivar_ssdt_load() call, as in:

$ git diff
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index ad3b1f4866b3..691a8671a2ba 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -364,8 +364,8 @@ static int __init efisubsys_init(void)
         if (error)
                 goto err_put;

-       if (efi_enabled(EFI_RUNTIME_SERVICES))
-               efivar_ssdt_load();
+       //if (efi_enabled(EFI_RUNTIME_SERVICES))
+       //      efivar_ssdt_load();

         error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
         if (error) {

Any thoughts on how to fix this?


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 20:42 Scott Talbert [this message]
2019-09-11 23:17 ` Ard Biesheuvel

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