🎧 If you have to use a Chromebox with GNU/Linux, the sound might not work right away. To get Intel Corporation Sunrise Point-LP HD Audio working, do do the following:
+
1 echo "options snd-intel-dspcfg dsp_driver=1" > /etc/modprobe.d/inteldsp.conf
+Once you reboot, you should be able to use Audio over HDMI or the built-in headphone jack.
+ + + + +Here is how you can detect if you’ve booted your computer using a UEFI BIOS or a Legacy BIOS. First, install the dmidecode utility from your operating system repository. On Debian, you can:
1apt-get install dmidecode
+dmidecode reports information related to the BIOS under a type 0 entry. A quick way to detect the BIOS mode is:
1sudo dmidecode -t 0 | grep UEFI > /dev/null && echo UEFI || echo BIOS
+On a (Legacy) BIOS system you would see:
+ 1$ sudo dmidecode -t 0
+ 2# dmidecode 3.4
+ 3Getting SMBIOS data from sysfs.
+ 4SMBIOS 3.0.0 present.
+ 5
+ 6Handle 0x0000, DMI type 0, 26 bytes
+ 7BIOS Information
+ 8 Vendor: 3mdeb
+ 9 Version: Dasharo (coreboot+SeaBIOS)
+10 Release Date: 08/23/2022
+11 ROM Size: 12 MB
+12 Characteristics:
+13 PCI is supported
+14 PC Card (PCMCIA) is supported
+15 BIOS is upgradeable
+16 Selectable boot is supported
+17 ACPI is supported
+18 Targeted content distribution is supported
+19 BIOS Revision: 0.0
+20 Firmware Revision: 0.0
+On a UEFI system you would see:
+ 1$ sudo dmidecode -t 0
+ 2# dmidecode 3.4
+ 3Getting SMBIOS data from sysfs.
+ 4SMBIOS 3.1.1 present.
+ 5
+ 6Handle 0x0000, DMI type 0, 26 bytes
+ 7BIOS Information
+ 8 Vendor: American Megatrends Inc.
+ 9 Version: 2202
+10 Release Date: 07/14/2020
+11 Address: 0xF0000
+12 Runtime Size: 64 kB
+13 ROM Size: 16 MB
+14 Characteristics:
+15 PCI is supported
+16 APM is supported
+17 BIOS is upgradeable
+18 BIOS shadowing is allowed
+19 Boot from CD is supported
+20 Selectable boot is supported
+21 BIOS ROM is socketed
+22 EDD is supported
+23 Print screen service is supported (int 5h)
+24 8042 keyboard services are supported (int 9h)
+25 Serial services are supported (int 14h)
+26 Printer services are supported (int 17h)
+27 ACPI is supported
+28 USB legacy is supported
+29 BIOS boot specification is supported
+30 Targeted content distribution is supported
+31 UEFI is supported
+32 BIOS Revision: 5.13
+#uefi #seabios #coreboot #bios 👢
+ + + +Welcome to 🏡 Hacks.Wiki - a Wikifull of Hacks
+Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so. - Douglas Adams
+Hacks.Wiki is an experiment to organise quick hacks, notes, bookmarks and tools into an easy-to-build-and-maintain “Digital Garden”.
+It should take others far less time and effort to do what we’ve already done.
+You can start by visiting Recent entries. Or start by browsing the Hashtags. There is also a RSS Feed that you can subscribe to. And - 🎊surprise - there is an ActivityPub handle as well; Just follow hacks@hacks.wiki via a Mastodon / Pleroma / Soapbox / Misskey and other instances and tools.
Unless otherwise noted, all hacks in this wiki are licensed under CC-BY-4.0.
+ + +Migrating Grub from a UEFI system to a BIOS (legacy) system 🔁
+The general steps are:
+/dev, /sys, /proc and /run2EF02 BIOS boot partition3Here is someone who has documented this process in good detail:
+ +#grub #seabios #coreboot #uefi
+Mounting BTRFS subvolumes needs an extra option ↩︎
+for f in dev sys proc run; do mount --bind /$f /mnt/$f; done ↩︎
Remember to use gdisk if you have a GPT partition table. The BIOS boot partition code is EF02 ↩︎
grub-install /dev/sda ↩︎
If you have installed GNU/Linux with BTRFS as the filesystem, chances are that your OS installer has used sub-volumes for the root, home and other mount points. 🗄️
You can verify this by mounting the actual root filesystem device and listing its contents:
+1# ls -l /mnt/
+2total 0
+3drwxr-xr-x 1 root root 204 Feb 22 13:28 @
+4drwxr-xr-x 1 root root 180 Feb 22 14:29 @cache
+5drwxr-xr-x 1 root root 10 Dec 2 10:52 @home
+6drwxr-xr-x 1 root root 482 Feb 26 00:00 @log
+7drwxr-x--- 1 root root 350 Feb 23 15:40 @root
+8drwxr-xr-x 1 root root 14 Oct 19 07:42 @srv
+9drwxrwxrwt 1 root root 1576 Feb 27 17:18 @tmp
+Here @, @home, @log etc. are the BTRFS sub-volumes. @ is the OS root sub-volume. You can mount by giving the -osubvol=@ option to the mount command:
1# mount -osubvol=@ /dev/dm-0 /mnt/
+ 2# ls -l /mnt/
+ 3total 24
+ 4lrwxrwxrwx 1 root root 7 Feb 1 02:21 bin -> usr/bin
+ 5drwxr-xr-x 1 root root 208 Feb 22 13:30 boot
+ 6drwxr-xr-x 1 root root 8 Oct 20 18:39 dev
+ 7drwxr-xr-x 1 root root 5018 Feb 25 10:56 etc
+ 8drwxr-xr-x 1 root root 0 Dec 2 10:48 home
+ 9lrwxrwxrwx 1 root root 7 Feb 1 02:21 lib -> usr/lib
+10lrwxrwxrwx 1 root root 7 Feb 1 02:21 lib64 -> usr/lib
+11drwxr-xr-x 1 root root 22 Dec 16 13:00 mnt
+12drwxr-xr-x 1 root root 214 Feb 23 15:50 opt
+13drwxr-xr-x 1 root root 0 Dec 2 10:48 proc
+14drwxr-xr-x 1 root root 66 Oct 20 18:47 root
+15 .... .... ....
+#linux #btrfs #systemrescue #filesystem
+ + +Welcome to 🏡 Hacks.Wiki - a Wikifull of Hacks
+Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so. - Douglas Adams
+Hacks.Wiki is an experiment to organise quick hacks, notes, bookmarks and tools into an easy-to-build-and-maintain “Digital Garden”.
+It should take others far less time and effort to do what we’ve already done.
+You can start by visiting Recent entries. Or start by browsing the Hashtags. There is also a RSS Feed that you can subscribe to. And - 🎊surprise - there is an ActivityPub handle as well; Just follow hacks@hacks.wiki via a Mastodon / Pleroma / Soapbox / Misskey and other instances and tools.
Unless otherwise noted, all hacks in this wiki are licensed under CC-BY-4.0.
+ + +