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

[kshegunov]

@Ni.Sumi
Ms Sumi, you should use an external image hosting site, as nothing is visible for anyone but you. Image uploads are still not functional, and while they're supposed to be disabled, they're not for some reason ( @tekojo can elaborate).

[Ahti]

@Ni.Sumi

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.