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--- dell_xps_15_9530 [2014/11/24 13:31]
ben
+++ dell_xps_15_9530 [2020/09/22 20:17]
ben [ZFS root]
@@ Line 22: / Line 22: @@
 KDE defaults to letting the multimedia volume keys (Fn+F1/F2/F3) control the HDMI card by default. Switch this to the analog card by opening KMix and setting ''Settings->Select Master Channel...->Built-in Audio Analog Stereo''.
+If there's no sound when logging into plasma (the volume icon has a red cross through it, and the kde settings shows no devices), make sure pulseaudio user daemon is running, and if not start it one-time with ''pulseaudio -D'',
 ==== Graphics ====
@@ Line 89: / Line 90: @@
 Just works.
+===== Flashing BIOS =====
+Taken from [[https://wiki.archlinux.org/index.php/Flashing_BIOS_from_Linux#Using_a_FreeDOS-provided_Disk_Image_+_USB_stick_on_Linux|Arch Wiki]]
+  * Download the latest freedos version
+  * Flash it to the USB stick with ''dd''
+  * Mount and copy in the BIOS executable from [[https://www.dell.com/support/home/uk/en/ukbsdt1/product-support/product/xps-15-9530/drivers|Dell website]]
+  * Reboot into freedos, select the ''no drivers'' option (the default option leads to exceptions and the flash failing)
+    * It might also be necessary to disable Intel VTx, not confirmed; don't forget to re-enable after
+===== ZFS root =====
+  * Prepare the partition table manually
+    - BIOS boot for grub/mbr, 1M
+    - ext2 for /boot, 1G
+    - vfat for /efi, 1G
+    - zfs partition
+    - ext4 temporary filesystem for / during install
+  * Install sabayon to the ext4 partition at the end, but don't auto reboot at the end
+  * Create the ''zpool'' with ''zpool create rpool /dev/disk/by-id/wwn-*-part4''
+  * Create the ''root'', ''root/home'' and ''root/var'' filesystems within, with encrytion
+  * Set ''root filesystem'' to not be mountable automatically with ''zfs set canmount=off rpool/root''
+  * Set the mountpoints for each filesystem: <code bash>
+zfs set mountpoint=/ rpool/root
+zfs set mountpoint=/var rpool/root/var
+zfs set mountpoint=/home rpool/root/home
+</code>
+  * Mount the filesystems to arbitrary locations with: <code bash>
+mkdir /mnt/sysimage
+mount -o zfsutil -t zfs rpool/root /mnt/sysimage/root
+mount -o zfsutil -t zfs rpool/root/home /mnt/sysimage/root/home
+mount -o zfsutil -t zfs rpool/rootvar /mnt/sysimage/root/var
+</code>
+  * Rsync the contents into the ZFS root: <code bash>
+mkdir /mnt/temproot
+mount /dev/sda5 /mnt/temproot
+rsync -a /mnt/temproot/ /mnt/sysimage/
+</code>
+  * Prepare dracut for zfs root booting: <code text /mnt/sysimage/etc/dract.conf.d/99zfs.conf>
+add_dracutmodules+="dracut-systemd systemd systemd-initrd zfs"
+</code>
+  * Chroot into the zfs root filesystem and rebuild the initramfs: <code bash>
+dracut -f /boot/initramfs-genkernel-5.4.0-sabayon 5.4.0-sabayon
+</code>
+  * Remove the temporary partition
+  * Add a swap partition at the very end of the disk
+  * Extend the zfs partition to fill the remaining space
+  * Reboot and pray
+Kernel package installations run ''sabayon-dract --rebuild x.y'', which invokes dracut with a bunch of module omissions including all the systemd ones needed for ZFS to work. Therefore whenever upgrading the kernel, be sure to run ''dracut -f /boot/initramfs-genkernel-x86_64-$(uname -r) $(uname -r)''.
+Grub 2.02-r3 ships a version of ''grub2-probe'' which can't handle ZFS properly. This means the generated grub config file will contain ''root=ZFS=/root'' instead of ''root=ZFS=rpool/root'' which breaks root filesystem mounting. After installing grub or any kernel package, fix grub,cfg before rebooting.
+==== Failure to boot ====
+Errors on startup about system not having been booted with systemd. This is a problem with the dracut initrd.
+Manual boot:
+  * Edit grub kernel commandline to add ''rd.break=pre-mount'' and remove ''quiet splash''
+  * At the prompt, run: <code bash>
+zpool import rpool
+zfs load-key rpool/root
+# Enter encryption passphrase
+mount -t zfs -o zfsutil rpool/root /sysroot
+mount -t zfs -o zfsutil rpool/root/home /sysroot/home
+mount -t zfs -o zfsutil rpool/root/var /sysroot/var
+mount -t zfs -o zfsutil rpool/root/docker /sysroot/var/lib/docker
+exit
+</code>
+  * After boot, regenerate the initrd <code bash>
+dracut -f /boot/initramfs-genkernel-5.4.0-sabayon 5.4.0-sabayon
+</code>
+Known issues:
+  * Infinite loop of something complaining about system not having been booted with systemd, dbus error: Initramfs was built without systemd support, and needs rebuilding
+  * Error that ''\'rpool/root\''' contains invalid characters and is not a valid filesystem name: ''/usr/lib/dracut/modules.d/90zfs/mount-zfs.sh'' contains errant single quotes, which need to be removed. Rebuild the initrd afterwards: <code bash>
+# This:
+                                ask_for_password \
+                                        --tries 5 \
+                                        --prompt "Encrypted ZFS password for ${ENCRYPTIONROOT}: " \
+                                        --cmd "zfs load-key '${ENCRYPTIONROOT}'"
+# Should be:
+                                ask_for_password \
+                                        --tries 5 \
+                                        --prompt "Encrypted ZFS password for ${ENCRYPTIONROOT}: " \
+                                        --cmd "zfs load-key ${ENCRYPTIONROOT}"
+</code>

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