Can you guys please test this simple Qt program on your machine ?

Ahti

lol so you get the same error message ? :D i though i was the only one with that kind of problem :) can you tell me your pc config ?
btw thanks man :D

mrjj

Win 7 64 bit, Qt 5.7

Ahti

@mrjj

whoa! that is different :D

Ni.Sumi

@Ahti

Windows 7 64 bit with Qt 5.6 Vs2013.

@kshegunov Okay, I did not know this. Thanks. :)

Ahti

@Ni.Sumi

man i think your monitor doesn't support DDC/CI you should check it.

mrjj

@Ahti
My monitor does support it.
tested with this program
http://clickmonitorddc.bplaced.net/

Ahti

@mrjj

that program doesn't work on my machine it crashes after couple of seconds with the error message "ClickMonitorDDC cannot detect monitor, program will exit"

mrjj

@Ahti
ok. worked fine for me on win xp, win 7, win 10.
let me try non laptop. :)

Ahti

@mrjj

i once posted a question about I2C bus error message in windows forum and one of the reply said "SetMonitorBrightness" won't work on desktop its for laptops :O

mrjj

@Ahti
Well often only laptops/tablets have the hardware.
Tested in desktop win 10 and it it fail to read and set. (clickmonitorddc).

Ahti

@mrjj

what do you mean by that ?

mrjj

The harware needed for setting screen brighness is often found in
laptops screens and tables. for older screens its simply not supported.
I tried 4 here. and none of them allowed brightness to be set.
Only laptop and win 8 table allowed it.