No HDMI output on Lenovo V145, NetBSD 8.0

[Mayuresh <mayuresh%acm.org@localhost>]

I have a NetBSD 8.0 installation on a USB stick, working fine on an asus
laptop.

Now I have another lenovo laptop[1] that boots fine using the same stick
but for HDMI not showing any output.

$ uname -a
NetBSD asusnetbsd 8.0 NetBSD 8.0 (GENERIC) #0: Tue Jul 17 14:59:51 UTC
2018  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC
amd64 x86_64 AMD 686-class NetBSD

Please the following dmesg message, also let me know if I should grep for
more:

$ dmesg  | grep -i hdmi
hdafg0: HDMI00 2ch: Digital Out [Jack]

HDMI cable is connected right from boot time and it shows nothing during
boot. I don't think it's an X11 matter. But just in case it matters I am
using native X11 and xrandr shows:

$ xrandr 
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768
default connected 1368x768+0+0 0mm x 0mm
   1366x768       0.00  
   1368x768       0.00* 

Would appreciate help to get this work.

Mayuresh

[1]
https://www.lenovo.com/in/en/laptops/lenovo/v-series/Lenovo-V145-15AST/p/88LG80V1181