mirror of
https://github.com/QubesOS/qubes-doc.git
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282 lines
12 KiB
Markdown
282 lines
12 KiB
Markdown
---
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lang: en
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layout: doc
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permalink: /doc/uefi-troubleshooting/
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ref: 177
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title: UEFI troubleshooting
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---
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## Successfully installed in legacy mode, but had to change some kernel parameters
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If you've installed successfully in legacy mode but had to change some kernel parameters for it to work, you should try installing in UEFI mode with the same parameters.
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**Change the xen configuration on a USB media**
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01. Attach the usb disk, mount the EFI partition (second partition available on the disk)
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02. Open a terminal and enter the command `sudo su -`. Use your preferred text editor (e.g `nano`) to edit your xen config (`EFI/BOOT/BOOTX64.cfg`):
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```
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nano EFI/BOOT/BOOTX64.cfg
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```
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03. Change the `kernel` key to add your kernel parameters on the boot entry of your choice
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04. Install using your modified boot entry
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**Change xen configuration directly in an iso image**
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01. Set up a loop device (replacing `X` with your ISO's version name): `losetup -P /dev/loop0 Qubes-RX-x86_64.iso`
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02. Mount the loop device: `sudo mount /dev/loop0p2 /mnt`
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03. Edit `EFI/BOOT/BOOTX64.cfg` to add your params to the `kernel` configuration key
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04. Save your changes, unmount and dd to usb device
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## Installation freezes before displaying installer
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If you have an Nvidia card, see also [Nvidia Troubleshooting](https://github.com/Qubes-Community/Contents/blob/master/docs/troubleshooting/nvidia-troubleshooting.md#disabling-nouveau).
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### Removing `noexitboot` and `mapbs`
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Some systems can freeze with the default UEFI install options.
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You can try the following to remove `noexitboot` and `mapbs`.
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1. Follow the [steps here](/doc/uefi-troubleshooting/#successfully-installed-in-legacy-mode-but-had-to-change-some-kernel-parameters) to edit the `[qubes-verbose]` section of your installer's `BOOTX64.cfg`.
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You want to comment out the `mapbs` and `noexitboot` lines.
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The end result should look like this:
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~~~
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[qubes-verbose]
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options=console=vga efi=attr=uc
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# noexitboot=1
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# mapbs=1
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kernel=vmlinuz inst.stage2=hd:LABEL=Qubes-R4.0-x86_64 i915.alpha_support=1
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ramdisk=initrd.img
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~~~
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2. Boot the installer and continue to install as normal, but don't reboot the system at the end when prompted.
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3. Go to `tty2` (Ctrl-Alt-F2).
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4. Use your preferred text editor (`nano` works) to edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg`, verifying the `noexitboot` and `mapbs` lines are not present.
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This is also a good time to make permanent any other changes needed to get the installer to work, such as `nouveau.modeset=0`.
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For example:
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~~~
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[4.14.18-1.pvops.qubes.x86_64]
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options=loglvl=all dom0_mem=min:1024M dom0_mem=max:4096M iommu=no-igfx ucode=scan efi=attr=uc
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~~~
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5. Go back to `tty6` (Ctrl-Alt-F6) and click `Reboot`.
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6. Continue with setting up default templates and logging in to Qubes.
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### Changing `options=console=` parameter to `none`
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If removing `noexitboot` and `mapbs` did not help, you can try changing the `options=console=` parameter to `none`. The detailed solution can be found in the comments of [this GitHub issue](https://github.com/QubesOS/qubes-issues/issues/5383)
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1. Follow the [steps here](/doc/uefi-troubleshooting/#successfully-installed-in-legacy-mode-but-had-to-change-some-kernel-parameters) to edit the `[qubes-verbose]` section of your installer's `BOOTX64.cfg`.
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You want to change `options=console=vga` to `options=console=none`.
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The end result should look like this:
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~~~
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[qubes-verbose]
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options=console=none efi=attr=uc
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noexitboot=1
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mapbs=1
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kernel=vmlinuz inst.stage2=hd:LABEL=Qubes-R4.0-x86_64 i915.alpha_support=1
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ramdisk=initrd.img
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~~~
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2. Boot the installer and continue to install as normal
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### Disable EFI runtime services
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On some early, buggy UEFI implementations, you may need to disable EFI under Qubes completely.
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This can sometimes be done by switching to legacy mode in your BIOS/UEFI configuration.
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If that's not an option there, or legacy mode does not work either, you can try the following to add `efi=no-rs`.
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Consider this approach as a last resort, because it will make every Xen update a manual process.
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1. Follow the [steps here](/doc/uefi-troubleshooting/#successfully-installed-in-legacy-mode-but-had-to-change-some-kernel-parameters) to edit the `[qubes-verbose]` section of your installer's `xen.cfg`.
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You want to modify the `efi=attr=uc` setting and comment out the `mapbs` and `noexitboot` lines.
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The end result should look like this:
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~~~
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[qubes-verbose]
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options=console=vga efi=no-rs
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# noexitboot=1
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# mapbs=1
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kernel=vmlinuz inst.stage2=hd:LABEL=Qubes-R4.0-x86_64 i915.alpha_support=1
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ramdisk=initrd.img
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~~~
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2. Boot the installer and continue to install as normal, until towards the end when you will receive a warning about being unable to create the EFI boot entry.
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Click continue, but don't reboot the system at the end when prompted.
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3. Go to `tty2` (Ctrl-Alt-F2).
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4. Use your preferred text editor (`nano` works) to edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg`, adding the `efi=no-rs` option to the end of the `options=` line.
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For example:
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~~~
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[4.14.18-1.pvops.qubes.x86_64]
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options=loglvl=all dom0_mem=min:1024M dom0_mem=max:4096M iommu=no-igfx ucode=scan efi=no-rs
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~~~
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5. Execute the following commands:
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~~~
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cp -R /mnt/sysimage/boot/efi/EFI/qubes /mnt/sysimage/boot/efi/EFI/BOOT
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mv /mnt/sysimage/boot/efi/EFI/BOOT/xen-*.efi /mnt/sysimage/boot/efi/EFI/BOOT/BOOTX64.efi
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mv /mnt/sysimage/boot/efi/EFI/BOOT/xen.cfg /mnt/sysimage/boot/efi/EFI/BOOT/BOOTX64.cfg
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~~~
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6. Go back to `tty6` (Ctrl-Alt-F6) and click `Reboot`.
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7. Continue with setting up default templates and logging in to Qubes.
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Whenever there is a kernel or Xen update for Qubes, you will need to follow [these steps](/doc/uefi-troubleshooting/#boot-device-not-recognized-after-installing) because your system is using the fallback UEFI bootloader in `[...]/EFI/BOOT` instead of directly booting to the Qubes entry under `[...]/EFI/qubes`.
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## Installation from USB stick hangs on black screen
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Some laptops cannot read from an external boot device larger than 8GB. If you encounter a black screen when performing an installation from a USB stick, ensure you are using a USB drive less than 8GB, or a partition on that USB lesser than 8GB and of format FAT32.
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## Installation completes successfully but then boot loops or hangs on black screen
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There is a [common bug in UEFI implementation](http://xen.markmail.org/message/f6lx2ab4o2fch35r) affecting mostly Lenovo systems, but probably some others too.
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While some systems need `mapbs` and/or `noexitboot` disabled to boot, others require them enabled at all times.
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Although these are enabled by default in the installer, they are disabled after the first stage of a successful install.
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You can re-enable them either as part of the install process:
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1. Perform installation normally, but don't reboot the system at the end yet.
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2. Go to `tty2` (Ctrl-Alt-F2).
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3. Enable `mapbs` and/or `noexitboot` on the just installed system.
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Edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg` (you can use `vi` or `nano` editor) and add to every kernel section:
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```
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mapbs=1
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noexitboot=1
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```
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**Note:** You must add these parameters on two separate new lines (one
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parameter on each line) at the end of each section that includes a kernel
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line (i.e., all sections except the first one, since it doesn't have a
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kernel line).
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4. Go back to `tty6` (Ctrl-Alt-F6) and click `Reboot`.
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5. Continue with setting up default templates and logging in to Qubes.
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Or if you have already rebooted after the first stage install and have encountered this issue, by:
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1. Boot into [rescue mode](/doc/uefi-troubleshooting/#accessing-installer-rescue-mode-on-uefi).
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2. Enable `mapbs` and/or `noexitboot` on the just installed system.
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Edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg` (you can use `vi` or `nano` editor) and add to every kernel section:
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```
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mapbs=1
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noexitboot=1
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```
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**Note:** You must add these parameters on two separate new lines (one
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parameter on each line) at the end of each section that includes a kernel
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line (i.e., all sections except the first one, since it doesn't have a
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kernel line).
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3. Type `reboot`.
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4. Continue with setting up default templates and logging in to Qubes.
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## Installation completes successfully but then system crash/restarts on next boot
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Some Dell systems and probably others have [another bug in UEFI firmware](http://markmail.org/message/amw5336otwhdxi76).
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These systems need `efi=attr=uc` enabled at all times.
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Although this is enabled by default in the installer, it is disabled after the first stage of a successful install.
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You can re-enable it either as part of the install process:
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1. Perform installation normally, but don't reboot the system at the end yet.
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2. Go to `tty2` (Ctrl-Alt-F2).
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3. Execute:
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```
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sed -i -e 's/^options=.*/\0 efi=attr=uc/' /mnt/sysimage/boot/efi/EFI/qubes/xen.cfg
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```
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4. Go back to `tty6` (Ctrl-Alt-F6) and click `Reboot`.
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5. Continue with setting up default templates and logging in to Qubes.
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Or if you have already rebooted after the first stage install and have encountered this issue, by:
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1. Boot into [rescue mode](/doc/uefi-troubleshooting/#accessing-installer-rescue-mode-on-uefi).
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2. Execute:
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```
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sed -i -e 's/^options=.*/\0 efi=attr=uc/' /mnt/sysimage/boot/efi/EFI/qubes/xen.cfg
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```
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3. Type `reboot`.
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4. Continue with setting up default templates and logging in to Qubes.
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## Boot device not recognized after installing
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Some firmware will not recognize the default Qubes EFI configuration.
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As such, it will have to be manually edited to be bootable.
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This will need to be done after every kernel and Xen update to ensure you use the most recently installed versions.
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1. Copy the `/boot/efi/EFI/qubes/` directory to `/boot/efi/EFI/BOOT/` (the contents of `/boot/efi/EFI/BOOT` should be identical to `/boot/efi/EFI/qubes` besides what is described in steps 2 and 3):
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```
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cp -r /boot/efi/EFI/qubes/. /boot/efi/EFI/BOOT
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```
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2. Rename `/boot/efi/EFI/BOOT/xen.cfg` to `/boot/efi/EFI/BOOT/BOOTX64.cfg`:
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```
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mv /boot/efi/EFI/BOOT/xen.cfg /boot/efi/EFI/BOOT/BOOTX64.cfg
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```
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3. Copy `/boot/efi/EFI/qubes/xen-*.efi` to `/boot/efi/EFI/qubes/xen.efi` and `/boot/efi/EFI/BOOT/BOOTX64.efi`.
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For example, with Xen 4.8.3 (you may need to confirm file overwrite):
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```
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cp /boot/efi/EFI/qubes/xen-4.8.3.efi /boot/efi/EFI/qubes/xen.efi
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cp /boot/efi/EFI/qubes/xen-4.8.3.efi /boot/efi/EFI/BOOT/BOOTX64.efi
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```
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## Installation finished but "Qubes" boot option is missing and xen.cfg is empty / Installation fails with "failed to set new efi boot target"
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In some cases installer fails to finish EFI setup and leave the system without a Qubes-specific EFI configuration.
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In such a case you need to finish those parts manually.
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You can do that just after installation (switch to `tty2` with Ctrl-Alt-F2), or by booting from installation media in [rescue mode](/doc/uefi-troubleshooting/#accessing-installer-rescue-mode-on-uefi).
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1. Examine `/boot/efi/EFI/qubes` (if using Qubes installation media, it's in `/mnt/sysimage/boot/efi/EFI/qubes`). You should see 4 files there:
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- xen.cfg (empty, size 0)
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- xen-(xen-version).efi
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- vmlinuz-(kernel-version)
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- initramfs-(kernel-version).img
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2. Copy `xen-(xen-version).efi` to `xen.efi`:
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```
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cd /mnt/sysimage/boot/efi/EFI/qubes
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cp xen-*.efi xen.efi
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```
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3. Create xen.cfg with this content (adjust kernel version, and filesystem
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locations, below values are based on default installation of Qubes 3.2):
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```
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[global]
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default=4.4.14-11.pvops.qubes.x86_64
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[4.4.14-11.pvops.qubes.x86_64]
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options=loglvl=all dom0_mem=min:1024M dom0_mem=max:4096M
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kernel=vmlinuz-4.4.14-11.pvops.qubes.x86_64 root=/dev/mapper/qubes_dom0-root rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap i915.preliminary_hw_support=1 rhgb quiet
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ramdisk=initramfs-4.4.14-11.pvops.qubes.x86_64.img
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```
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4. Create boot entry in EFI firmware (replace `/dev/sda` with your disk name and `-p 1` with `/boot/efi` partition number):
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```
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efibootmgr -v -c -u -L Qubes -l /EFI/qubes/xen.efi -d /dev/sda -p 1 "placeholder /mapbs /noexitboot"
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```
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## Accessing installer Rescue mode on UEFI
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In UEFI mode, the installer does not have a boot menu, but boots directly into the installation wizard.
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To get into Rescue mode, you need to switch to tty2 (Ctrl+Alt+F2) and then execute:
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~~~
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pkill -9 anaconda
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anaconda --rescue
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~~~
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