Re: [PATCH] installer: suppress kernel info/debug messages

["'Florian Bezdeka' via isar-users" <isar-users@googlegroups.com>]

On Fri, 2026-01-09 at 10:54 +0000, Heinisch, Alexander (FT RPD CED SES-
AT) wrote:
> On Mon, 2026-01-05 at 11:24 +0200, Anton Mikanovich wrote:
> > Applied to next, thanks.
> Sry for the late reply - holiday season :-)
> 
> > 
> > 23/12/2025 04:15, 'Badrikesh Prusty' via isar-users wrote:
> > > Lower the kernel log level to 4 to suppress notice, info, and debug
> > > messages on the console.
> > > This prevents audit and driver messages from cluttering the screen
> > > while keeping critical errors and systemd service status output
> > > visible, resulting in a cleaner installer UI.
> > > 
> > > Signed-off-by: Badrikesh Prusty <badrikesh.prusty@siemens.com>
> > > ---
> > >   meta-isar/recipes-core/images/isar-image-installer.bb | 3 ++-
> > >   1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/meta-isar/recipes-core/images/isar-image-installer.bb
> > > b/meta-isar/recipes-core/images/isar-image-installer.bb
> > > index 3511f3f6..a58f8849 100644
> > > --- a/meta-isar/recipes-core/images/isar-image-installer.bb
> > > +++ b/meta-isar/recipes-core/images/isar-image-installer.bb
> > > @@ -11,7 +11,8 @@ DESCRIPTION = "Example of a ISAR based Installer
> > > Image"
> > >   INSTALLER_WKS_FILE ??= "installer-efi.wks.in"
> > >   WKS_FILE = "${INSTALLER_WKS_FILE}"
> > >   
> > > -ADDITIONAL_KERNEL_CMDLINE ??= ""
> > > +# Hide kernel warning/info/debug messages
> > > +ADDITIONAL_KERNEL_CMDLINE ??= "loglevel=4"
> > > 
> 
> I guess the reason for that is to have readable output while running
> the target bootstrapper?
> As for the installer image this service is run pretty late, maybe you
> could reduce kernel logs when starting that service? (e.g.
> PreStart=...)

Which service? We're talking about kernel cmdline arguments here. Those
have impact on system startup/boot already. PreStart= seems to point
into the direction of systemd, which is involved way later in the boot
process.

> 
> > >   
> > >   OVERRIDES .= "${@':unattended-installer' if
> > > bb.utils.to_boolean(d.getVar('INSTALLER_UNATTENDED')) else ''}"
> > >   ADDITIONAL_KERNEL_CMDLINE:append:unattended-installer = " \
> 
> 

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