Public bug reported:
I set up Ubuntu 20.04.1 (64bit) on a Raspberry PI 3. Since I require
more RAM to processes, but no Video, I want to set
```
gpu_mem=16
```
When putting this line into `/boot/firmware/usercfg.txt` (nothing else
in this file, just this line, followed by a newline), it seems to be
ignored, putting it into `/boot/firmware/config.txt` directly works.
### System info
```
$ lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04
```
- Raspberry PI 3 (not 3+)
- All updates applied using `apt-get full-upgrade`, otherwise fresh install
### How to reproduce
- Find how much total RAM is available, using e.g. `free`
- Add the line above in `/boot/firmware/usercfg.txt` and reboot
- Call `free` again, the total amount of RAM has not changed comparing to 2
lines above
- Add the line above in `/boot/firmware/config.txt` and reboot
- Call `free` again, the total amount of RAM **has** changed
### Expected behaviour
It should not matter where I put that option, both changing config.txt
and usercfg.txt should have the same effect -- especially since
`config.txt` tells me not to edit it but put my configuration to
`usercfg.txt`.
If that's not possible for this specific setting, a list of values that
cannot be changed using usercfg.txt should be documented.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1891802
Title:
Raspberry Pi: setting gpu_mem in usercfg.txt is ignored
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