Created attachment 123785 [details]
On laptops with G72M picture on VGA output is always wavy (please look into attached photo). That was tested with two laptops (with 7300 Go and 7400 Go) couple of projectors (800x600) and few displays (up to 1920x1080) - issue is reproducible with any combination with any Linux that was released for latest ~three years (with Linux 4.6 too). Other issue is that VGA output is always mirror of internal laptop screen, no matter what settings I set (again, as you can see on attached photo).
01:00.0 VGA compatible controller: NVIDIA Corporation G72M [GeForce Go 7400] (rev a1)
Issue is not reproducible with proprietary driver (however this driver have other issues, like lack of proper V-Sync, and latest KWin is crash on nvidia 304 driver even if all effects disabled).
Created attachment 123786 [details]
(In reply to russianneuromancer from comment #0)
> latest ~three years (with Linux 4.6 too). Other issue is that VGA output is
> always mirror of internal laptop screen, no matter what settings I set
> (again, as you can see on attached photo).
This leads me to believe that you're not using nouveau. Please provide dmesg + xorg log from an affected machine.
Created attachment 123790 [details]
dmesg with Linux 4.4.0-22 from Ubuntu repository without debug
Created attachment 123791 [details]
Hm, well it seems to correctly detect your DVI-I-1 connector and the modes of the display attached to it. Unfortunately I don't know much about pre-NV50 display details, esp when panels are involved. Hopefully someone else will have a look.
btw, VGA video output is wavy even before Xorg start - on boot log or splash screen. And I also forgot to mention that waves doesn't stay still but continuously move from top to the bottom.