[RndTbl] Raspberry Pi OS 12 bookworm and Wayland - no screen saver?

[Gilbert Detillieux]

I use my Pi 400 just as a test platform before deploying any new OS 
version to other Pi's I use for other purposes.  I have a Pi 4 that I 
use for digital signage (just running chromium in kiosk mode), and am 
anticipating upgrading it to the latest OS, but wanted to make sure 
there's be no glitches with using Wayland. (Although I usually disable 
screen blanking for that, I do blank the screen there too... outside of 
office hours.  So my previous post is relevant to this application.)

I also have a bunch of original Pi Model B's, that I use for 
temp/humidity monitoring.  I don't need anything fancy from the OS (and 
certainly no GUI), but I do want to use a supported OS, so I try to use 
the oldstable release on those as much as possible.

Gilbert

On 2023-11-04 1:41 p.m., Chris Audet wrote:
> I gave this a try on my Pi 3 Model B, but it turns out this model only 
> supports x11 for now (I tried "raspi-config > Advanced Options > 
> Wayland" and reboot but I think it's still using x11).
> 
> Just curious, what application are you running on the Pi?
> 
> I mostly use them for digital signage with FullPageOS, so haven't used 
> the screen blanking feature until you mentioned this issue.
> 
> chrisa at raspberrypi:~ $ cat /etc/os-release
> PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
> 
> chrisa at raspberrypi:~ $ cat /proc/cpuinfo | grep Model
> Model           : Raspberry Pi 3 Model B Plus Rev 1.3
> 
> chrisa at raspberrypi:~ $ echo $XDG_SESSION_TYPE
> x11
> 
> Relevant KB:
> https://www.raspberrypi.com/documentation/computers/configuration.html#wayland <https://www.raspberrypi.com/documentation/computers/configuration.html#wayland>
> "In the current version of Raspberry Pi OS Bookworm, the Raspberry Pi 4 
> and Pi 400 use Wayland by default; other models of Raspberry Pi use X11 
> by default."
> 
> On Wed, Oct 18, 2023 at 3:18 PM Gilbert Detillieux 
> <Gilbert.Detillieux at umanitoba.ca 
> <mailto:Gilbert.Detillieux at umanitoba.ca>> wrote:
> 
>     And apparently when you disable screen blanking again, you get this
>     value in .config/wayfire.ini:
> 
>     dpms_timeout=-1
> 
>     Gilbert
> 
>     On 2023-10-18 3:06 p.m., Gilbert Detillieux wrote:
>      > Answering my own question, it would appear that you can set screen
>      > blanking (DPMS) in the command-line/TUI tool, raspi-config...
>      >
>      > pi at raspberrypi:~ $ sudo raspi-config
>      > pi at raspberrypi:~ $ tail -2 .config/wayfire.ini
>      > [idle]
>      > dpms_timeout=600
>      > pi at raspberrypi:~ $
>      >
>      > In raspi-config, select "2 Display Options", then "D2 Screen
>     Blanking",
>      > then enable.  The above change to .config/wayfire.ini seems to be
>     the
>      > net effect.  The timeout is set to 600 seconds, and could
>     probably be
>      > changed to any reasonable value, and likely 0 would disable it again.
>      >
>      > Funny that there wasn't a more obvious way to set this, via GUI
>     screen
>      > preferences.
>      >
>      > Gilbert
>      >
>      > On 2023-10-18 1:03 p.m., Gilbert Detillieux wrote:
>      >> So, with all the hype around the new Raspberry Pi 5 (still
>     waiting for
>      >> availability), and the new OS version, I thought I'd give the OS
>     a try
>      >> on my Pi 400, and see how things look with the new Wayland-based
>     GUI.
>      >>
>      >> One strange thing I noticed (other than the slight increase in
>     CPU use
>      >> and slightly higher CPU temperature) is that there's no screen
>      >> saver/blanker enabled by default.  Stranger still is there doesn't
>      >> seem to be any way to enable it, at least not that I've been
>     able to
>      >> find.
>      >>
>      >> The old X11/Xorg-based screen savers definitely don't work with
>      >> Wayland, and I don't want to turn off my monitor (and have to
>     remember
>      >> to do so) every time I'm done using the Pi.  So, does anyone
>     know how
>      >> I can enable screen blanking in Wayland?  (Preferably with Pi OS
>      >> and/or Debian 12 bookworm, but any Wayland-related info would be
>      >> appreciated.)
>      >>
>      >> If that doesn't work, I may find myself reverting back to Xorg.
>      >>
>      >> Thanks,
>      >> Gilbert

-- 
Gilbert Detillieux          E-mail: Gilbert.Detillieux at umanitoba.ca
Computer Science            Web:    http://www.cs.umanitoba.ca/~gedetil/
University of Manitoba      Phone:  204-474-8161
Winnipeg MB CANADA  R3T 2N2
For best CS dept. service, contact <cs-support at lists.umanitoba.ca>.