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[[!meta title="Know issues"]]

Some machines have been reported to have problems starting Tails.

This list might not be accurate nor complete.

[[!toc]]

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Tails will not use memory after the first 3 GB
----------------------------------------------

Tails will not currently use more than 3 GB of memory, even if more
is installed on the system. This is a limitation of the [[current
kernel selection mechanism|todo/nx_bit]].

Tails will only use one core
----------------------------

Tails will not currently use more than one CPU core, even if there is
more core or more CPUs installed on the system. This is a limitation of the
[[current kernel selection mechanism|todo/nx_bit]].

Tails do not erase all the system memory on shutdown
----------------------------------------------------

Tails does not consistently [[erase all system memory as it
should|bugs/sdmem_does_not_clear_all_memory]].
It depends on the overall system memory, but it currently fails
to properly erase around 1.5 GB on a 4 GB system.

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Apple hardware
--------------

For the moment, Tails has a very limited support for Apple hardware.

Most recent Apple hardware does not boot without UEFI, and currently
Tails do not start with UEFI. See the corresponding
[[ticket|/todo/UEFI]].

See also [[bugs/Some old Macbooks running Lion 10.7 not booting Lion..can we get booting fixed ?]].

Dell Inc. Latitude E6430/0CPWYR
-------------------------------

Do not start on USB sticks created using Tails USB Installer.

With BIOS versions A03 06/03/2012

Error message: `Invalid partition table!`

Dell System XPS L702X/03RG89
----------------------------

Do not start on USB sticks created using Tails USB Installer.

With BIOS version A17 02/22/2012

Some users reported that the legacy BIOS shipped by Dell doesn't know
how to deal with the GPT partition scheme installed by Tails USB
Installer.

<http://en.community.dell.com/support-forums/laptop/f/3518/p/19392884/20010995.aspx>

ThinkPad X220
-------------

See the corresponding [[ticket|/bugs/ThinkPad_X220_vs_GPT]].