I did something similar - added to /etc/rc.local the following line:

/etc/init.d/eudev stop && /etc/init.d/eudev start

and it works. Here's a test iso:
https://get.refracta.org/files/testing/ … 7_1508.iso

sha256sum

59aea5d5075815f07f34cae046dc618a9ce99de78c2b737f8db36bd447cf8674  refracta10+stopstart_xfce_amd64-20200527_1508.iso

It's odd that using "stop" and "start" for eudev works, but using "restart" does not.

There' s cpufrequtils which will allow you to set the governor and/or frequency. Apparently, the kernel does some frequency scaling on its own these days, but there may be times you want to override that.

There's also cpulimit which will let you limit the amount of cpu(s) that a particular process or program can use. I use that to keep from overheating a laptop when mksquashfs is running.

Both are command-line tools and are easy to use.

Setting CRYPTSETUP=y will cause cryptsetup to be added to the initramfs if the root filesystem is NOT encrypted. (just tested this to be sure.) If root is encrypted, it'll be added without this setting. The wording in the comment for this setting suggests that in the future, it will be added if cryptsetup is installed, regardless of the root filesystem.

I use this setting in some live isos so that they can be used on a live-usb with an encrypted volume for full persistence.

You can check if the initramfs contains cryptsetup by running 'lsinitramfs' (from initramfs-tools-core package)

CRYPTSETUP=y

$ lsinitramfs /boot/initrd.img-4.19.0-9-amd64 | grep cryptsetup

usr/lib/cryptsetup
usr/lib/cryptsetup/askpass
usr/lib/cryptsetup/functions
usr/lib/x86_64-linux-gnu/libcryptsetup.so.12
usr/lib/x86_64-linux-gnu/libcryptsetup.so.12.4.0
usr/sbin/cryptsetup

I commented out that setting, ran 'update-initramfs -u' and re-checked with lsinitramfs. None of the above listed files were present.

The problems I've mentioned in this thread are specific to the live images. I think the only unsolved problem at this point is that the sound modules and some others don't get loaded every time you boot.

This may or may not be significant: The usb stick that had the failure was the no-name one I got for free. When I used one that I bought in a store, it worked. (A 16gb PNY)

Thanks for testing i386. I hadn't gotten around to doing that.

Update:

I tried the amd64 iso on a different usb stick, and it works. (snd modules are loaded)

Then I tried the i386 iso on the usb stick that failed with the amd64. It works. (snd loaded)

Then I made a dvd of the i386 and the sound modules did not get loaded.

Oh yeah, booting the amd64 iso in qemu and checking how many modules get loaded with lsmod | wc -l gives me different numbers on different reboots. Sometimes sound is loaded, sometimes not.

Thanks. That's easier, and it has the advantage of showing up in /proc/cmdline, so I can check if I used it or not. Unfortunately, it doesn't help. Lots of modules are missing, including snd.

The problem also exists on isohybrid-imaged usb. It's not limited to optical media.

Multi-boot usb does not have the problem.

Now we're cross-posting. See my update above.

I have no idea how to do that. How can you even tell if it's running single or multi-threaded?

What I can do is turn off some services in the default runlevel and see if that changes anything.

These modules get loaded when booting to ram but not when booting normally from dvd. The rtl8273ae is the right one for my wireless card. Your list might be slightly different.

cmac
btusb
btrtl
btbcm
btintel
intel_rapl
arc4
x86_pkg_temp_thermal
intel_powerclamp
rtl8723ae
coretemp
btcoexist
kvm_intel
rtl8723_common
rtl_pci
snd_hda_codec_hdmi
rtlwifi
snd_hda_codec_realtek
kvm
mac80211
uvcvideo
snd_hda_codec_generic
irqbypass
videobuf2_vmalloc
videobuf2_memops
videobuf2_v4l2
crct10dif_pclmul
crc32_pclmul
videobuf2_common
cfg80211
videodev
rtsx_usb_ms
snd_hda_intel
ghash_clmulni_intel
media
memstick
snd_hda_codec
snd_hda_core
intel_cstate
snd_hwdep
snd_pcm
intel_uncore
snd_timer
snd
intel_rapl_perf
pcspkr
joydev
efi_pstore
toshiba_bluetooth
pcc_cpufreq
iTCO_wdt
mei_me
serio_raw
efivars
soundcore
iTCO_vendor_support
mei
battery

No sound on DVD. That's true for beowulf RC and refracta beta5. The latter does not have pulseaudio.

Can't run alsamixer. "No such file" (even though it's right where it belongs at /usr/bin/alsamixer and is executable.)

aplay -l says "device_list:272: no soundcards found" but lspci sees it just fine.

Again, true on both pure devuan and refracta.

I tried restarting pulseaudio, alsa, eudev; tried removing pulseaudio and running with just alsa. Nothing.

Sound works fine in qemu.

Beowulf RC desktop-live and minimal-live isos are now available on files.devuan.org or your favorite iso mirror. 

Not sure if anyone mentioned it, but RC installer isos are there, too.

@HoaS: both. This is on an upgraded Refracta. (Not sure if I started with ascii or beowulf.)

Distributor ID:	Devuan
Description:	Devuan GNU/Linux 4 (chimaera/ceres)
Release:	testing/unstable
Codename:	n/a
/n/n
   ..,,;;;::;,..                   user@r10lvm 
           `':ddd;:,.              ----------- 
                 `'dPPd:,.         OS: Devuan GNU/Linux 4 (chimaera/ceres) x86_64 
                     `:b$$b`.      Host: KVM/QEMU (Standard PC (i440FX + PIIX, 1996) pc-i440fx-2.8) 
                        'P$$$d`    Kernel: 5.6.0-1-amd64 
                         .$$$$$`   Uptime: 6 mins 
                         ;$$$$$P   Packages: 1079 (dpkg) 
                      .:P$$$$$$`   Shell: bash 5.0.16 
                  .,:b$$$$$$$;'    Resolution: 1280x720 
             .,:dP$$$$$$$$b:'      DE: Xfce 
      .,:;db$$$$$$$$$$Pd'`         WM: Xfwm4 
 ,db$$$$$$$$$$$$$$b:'`             WM Theme: Clearlooks-Phenix-DarkPurpy 
:$$$$$$$$$$$$b:'`                  Theme: Clearlooks-Phenix-DarkPurpy [GTK2] 
 `$$$$$bd:''`                      Icons: nuoveXT2 [GTK2] 
   `'''`                           Terminal: xfce4-terminal 
                                   Terminal Font: Monospace 12 
                                   CPU: QEMU Virtual version 2.5+ (4) @ 2.394GHz 
                                   GPU: 00:02.0 Vendor 1234 Device 1111 
                                   Memory: 294MiB / 984MiB