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Re: ThinkPad T520: uefi/gpt based debian install

Am Freitag, 13. Mai 2011 schrieb Martin Steigerwald:
> Hi!
> I am about to receive a ThinkPad T520 with Intel SSD 320 real soon 
> hopefully.
> I wondered whether it might make sense to install with UEFI and GPT. 
> Informations from Arch Wiki hint at that for better alignment and less 
> space waste for SSD:
> https://wiki.archlinux.org/index.php/SSD#Using_GPT_-_RECOMMENDED_METHOD
> https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_Interf
> ace
> Did anyone here try this with any laptop with uefi BIOS? Did it work?
> Were  there problems? I have seen some Debian bug reports that were
> closed.

Just for the record. The ThinkPad BIOS Version: 8AET42WW (1.22 ), didn´t 
like to boot from a GPT partitioned SSD with BIOS Boot Partition and EFI 
System Partition. I made the latter just for the case I want to switch to 
EFI later on, but let grub-pc install to the BIOS Boot Partition.

Even after switching to MBR it didn´t work. Only after I zerod sector 2 to 
2047, the BIOS Boot Partition and the EFI System Partition and set the 
partition /boot bootable the BIOS booted from the SSD again. I do not 
think it was the bootable flag.

Maybe it was the EFI System Partition, but I also tried after removing it 
in gdisk. A parted mklabel msdos which should wipe the pre-existing GPT 
headers did not suffice.

So the exact circumstances why it didn´t work are unknown to me, but I now 
stick to MBR for the while being. Doesn´t matter anyway, as fdisk -cu also 
aligns at 1 MiB and displays partitions offsets and sizes in sectors.

Well I saw an report that it doesn´t work with a ThinkPad W520 as well.

Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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