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Add UEFI troubleshooting guide

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Marek Marczykowski-Górecki 2016-03-06 00:12:01 +01:00
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@ -140,6 +140,7 @@ Troubleshooting
* [Solving problems with Macbook Air 2012](https://groups.google.com/group/qubes-devel/browse_thread/thread/b8b0d819d2a4fc39/d50a72449107ab21#8a9268c09d105e69)
* [Getting Sony Vaio Z laptop to work with Qubes](/doc/sony-vaio-tinkering/)
* [Getting Lenovo 450 to work with Qubes](/doc/lenovo450-tinkering/)
* [Troubleshooting UEFI related problems](/doc/uefi-troubleshooting/)
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---
layout: doc
title: UEFI Troubleshooting
permalink: /doc/uefi-troubleshooting/
---
Troubleshooting UEFI related problems
========================================
Cannot start installation, it hangs after GRUB menu ("Test media and install Qubes OS")
---------------------
There is some [common bug in UEFI implementation](http://xen.markmail.org/message/f6lx2ab4o2fch35r), affecting mostly Lenovo systems, but probably some others too. You can try existing workaround:
1. In GRUB menu press `e`.
2. At the end of `chainloader` line add `/mapbs /noexitboot`.
3. Perform installation normally, but not reboot system at the end yet.
4. Go to `tty2` (Ctrl-Alt-F2).
5. Execute `mount | grep boot/efi` and note device name (first column). It should be something like `/dev/sda1`.
6. Execute `efibootmgr -v`, search for `Qubes` entry and note its number (it should be something like `Boot0001` - `0001` is an entry number).
7. Replace existing `Qubes` entry with modified one. Replace `XXXX` with entry number from previous step, `/dev/sda` with your disk name and `-p 1` with `/boot/efi` partition number):
efibootmgr -b XXXX -B
efibootmgr -v -c -u -L Qubes -l /EFI/qubes/xen.efi -d /dev/sda -p 1 "placeholder /mapbs /noexitboot"
8. Compare new entry with the old one (printed in step 6) - it should only differ in additional options at the end.
9. Now you can reboot the system by issuing `reboot` command.
System crash/restart when booting installer
-------------------------------------------
Some Dell systems and probably others have [another bug in UEFI firmware](http://markmail.org/message/amw5336otwhdxi76). And there is another workaround for it:
1. In GRUB menu press `e`.
2. At the end of `chainloader` line add `-- efi=attr=uc`.
3. Perform installation normally, but not reboot system at the end yet.
4. Go to `tty2` (Ctrl-Alt-F2).
5. Execute:
sed -i -e 's/^options=.*/\0 efi=attr=uc' /mnt/sysimage/boot/efi/qubes/xen.cfg
6. Now you can reboot the system by issuing `reboot` command.