Re: Power management and xscreensaver on armv7 (Pi2)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Wed, Jun 27, 2018 at 08:37:09AM +0530, Mayuresh wrote:
> On system:
> 
> $ uname -a
> NetBSD pi 8.0_RC1 NetBSD 8.0_RC1 (RPI2) #0: Sun Jun 17 16:30:05 IST 2018
> root@pi:/usr/src/sys/arch/evbarm/compile/RPI2 evbarm earmv7hf Cortex-A7
> r0p5 (Cortex V7A core) NetBSD
> 
> 
> I have enabled power saving options in xscreensaver, so as to switch off
> monitor after 1 minute of inactivity. (The same options are tested and
> work on amd64.)
> 
> On above system the screen is blanked but not switched off (backlight
> remains on) after inactivity.
> 
> Which layer does this issue appear to be with (xscreensaver, power
> management, the interaction between the two or the hardware) and are there
> some workarounds?

I guess it's because the framebuffer driver doesn't know how to
turn off HDMI (or whatever interface your display is connected to).
This was one of my motivation for writing video engine drivers
for the A20, and not rely on simplefb.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--