brian composed on 2016-10-02 14:23 (UTC-0400):

On Sun, 2 Oct 2016 19:29:12 +0200, err...@free.fr wrote:

what is your hadware?
graphic card?
and did you have any drivers or firmware for this? like firmware free or 
non-free, or drivers for nvidia, or amd etc.

It's an eMachines desktop which was originally supplied with Windows
7. I wiped Windows and loaded on Wheezy from a live DVD. The CPU is an
Athlon II x2 220 @ 800 MHz. The graphics (on the motherboard) is a
GeForce 6150 SE nForce 430 rev a2.

This has been a problematic gfxchip for more than one user over the years. Try adding this to the kernel cmdline:

        nouveau.config=NvMSI=0

I have a machine with the same gfxchip on its motherboard,
https://us.msi.com/Motherboard/K9N6PGM2V.html
but currently it doesn't have any Debian installed on it to check which if any releases are helped by it. It does have openSUSE 13.1 (kernel 3.12, server 1.14.3), 13.2 (kernel 3.16, server 1.16.1), 42.1 (kernel 4.1, server 1.17.2) and Tumbleweed (kernel 4.7.4, server 1.18.4) installed. All four suffer random brief video corruption running X. Tumbleweed seems to have almost eliminated the corruption that is excessive and unacceptable in the others. IIRC, last Debian tried on it was Wheezy with Gnome or Mate or Cinnamon, and too much trouble or impossible at that time to actually use X.

Something else to try is ensuring xserver-xorg-video-modesetting is installed, then purging xserver-xorg-video-nouveau and all traces of NVidia's proprietary driver bits. The modesetting driver has been getting quite some attention from the devs:
http://www.phoronix.com/scan.php?page=news_item&px=Ubuntu-Debian-Abandon-Intel-DDX

The original owner of this motherboard suffered to the extent he installed a PCI gfxcard as a workaround when the motherboard was rather young. I got the motherboard free when when he bought a new one that I installed after its original RAM went bad.

Looking at the output from a
dpkg -l there's no mention of any of the packages you list above. When
I installed Wheezy for my wife, I basically just accepted defaults, so
anything which has been loaded was loaded by the installer.

I can send you the full output from dpkg -l if you wish, just ask.
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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