On Friday, December 20, 2013 04:05:09 Zbigniew Jędrzejewski-Szmek wrote:
On Thu, Dec 19, 2013 at 09:11:17PM -0500, Garry T. Williams wrote:
I see these messages in my journal:
Dec 19 20:58:57 tfr systemd[1]: Started Load/Save Screen Backlight
Brightness of acpi_video0.
Why is the message repeated so many times?
Usually because something resets the brightness all the time and/or
the kernel reports brightness levels through udev events. The
journal itself has nothing to with this.
OK, I get the bit about the journal.
I found sort of the source of this:
garry@tfr$ udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[6722.903153] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.904958] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.906931] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.909084] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.910965] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.913139] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.913336] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.915996] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.916708] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.916778] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.917165] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.917525] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.917986] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.918265] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.920045] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.920410] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[6722.924880] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
UDEV [6722.925270] change
/devices/pci:00/:00:02.0/backlight/acpi_video0 (backlight)
^C%
garry@tfr$
I got this output by hitting (only once) Fn+F4.
So, I guess it's the kernel reporting the event nine times. I wonder
why that happens...
--
Garry T. Williams
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