Strange video artifacts

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Strange video artifacts

Postby randyoo on Sat May 02, 2009 7:17 pm

I noticed this immediately after installing Linux Mint (Felicia) on my in-law's computer: strange artifacts were showing up on-screen, fairly regularly. See the following images as examples (mostly cyan colored dots):

Picture 1.png
Video artifact example 1
Picture 1.png (27.67 KiB) Viewed 665 times

Picture 3.png
Video artifact example 2
Picture 3.png (25.14 KiB) Viewed 664 times

Picture 4.png
Video artifact example 3
Picture 4.png (43.08 KiB) Viewed 664 times


This computer dual-boots Windows and has no issues at the same resolution (which I don't know off the top of my head).

The really weird thing is that these artifacts also show up on my VNC client! I've seen similar artifacts caused by overclocking (which this machine is not), overheating, or faulty memory, but again, Windows is okay. And why would the same errors show in VNC if it's a hardware problem?

PS - Here's the relevant output of lshw:
Code: Select all
*-pci
             description: PCI bridge
             product: VT8237/VX700 PCI Bridge
             vendor: VIA Technologies, Inc.
             physical id: 1
             bus info: pci@0000:00:01.0
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: pci pm bus_master cap_list
           *-display UNCLAIMED
                description: VGA compatible controller
                product: Radeon RV100 QY [Radeon 7000/VE]
                vendor: ATI Technologies Inc
                physical id: 0
                bus info: pci@0000:01:00.0
                version: 00
                width: 32 bits
                clock: 66MHz
                capabilities: agp agp-2.0 pm bus_master cap_list
                configuration: latency=32 mingnt=8
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Re: Strange video artifacts

Postby Husse on Mon May 04, 2009 2:56 pm

You have to tell us some more facts.
The minimum is exactly which Mint you have - which version and which edition (main or any of the CEs)
We also need to know a bit about all your hardware.
Run " lspci " in a terminal and post here - would be nice to know the rest
Also tell us if this is using mint4win or not, quite important
I don 't recognize Radeon RV100 QY [Radeon 7000/VE] - seems to be from about 2004
With the newest drivers from ATI you need to use some legacy driver - only the newest cards are supported in the "normal" driver
Which driver do you use?
Please post your /etc/X11/xorg.conf
I have seen such dots as you write caused by overclocking, overheating, or faulty memory and god knows what - they just appeared (have sold computer hardware) The part about the VNC client is really odd
To be sure - a client on this computer?
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Re: Strange video artifacts

Postby randyoo on Tue May 26, 2009 9:20 am

Hello Husse, sorry for the late reply.

It's Linux Mint 6 Felicia main, NOT running mint4win. Yes, it's an ancient computer! :D

I'm not really sure which driver I'm using, but I guess it's a generic VGA driver? xorg.conf contents are posted below, hopefully that helps.

The problem is that this computer is thousands of miles away, and I'm trying to help remotely. I have SSH access, but the network connection is wireless, and set up in Gnome. So if we lose video, then I think we'll also lose network, so I'm afraid to risk anything remotely... It will have to wait until I visit them again.

Yes, this looks like a hardware problem, right? Overheating, overclocked, faulty memory, etc... When I say it's showing up on my VNC client, I mean that I'm using VNC on a different machine to connect to the ancient one that's showing the dots, both locally and remotely. (I hope that makes sense!) As I said before, the issue does not occur when running Windows, so I'm hoping it's something I'll be able to solve with drivers.

Here is the info you requested:

Code: Select all
randy@day-family-desktop / $ lspci
00:00.0 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:00.1 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:00.2 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:00.3 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:00.4 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:00.7 Host bridge: VIA Technologies, Inc. KT880 Host Bridge
00:01.0 PCI bridge: VIA Technologies, Inc. VT8237/VX700 PCI Bridge
00:09.0 Ethernet controller: ADMtek NC100 Network Everywhere Fast Ethernet 10/100 (rev 11)
00:0b.0 Ethernet controller: Atheros Communications Inc. AR5413 802.11abg NIC (rev 01)
00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420 SATA RAID Controller (rev 80)
00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81)
00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81)
00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81)
00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81)
00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge [KT600/K8T800/K8T890 South]
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 60)
00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 78)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]


and the xorg.conf:
Code: Select all
Section "Device"
        Identifier      "Configured Video Device"
EndSection

Section "Monitor"
        Identifier      "Configured Monitor"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
EndSection


Thanks for your time and reply!
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Re: Strange video artifacts

Postby Husse on Wed May 27, 2009 6:13 am

Here it is I who need help :)
I don't know much about VNC and have never used it - no need. But it is one of may things I would like to experiment with if I had more time
I often start out with the standard answer you got above to get a better understanding - or any understanding at all - of the situation
But in this case I now realize that this is really odd as you see the dotted lines in a remote VNC
I doubt that VNC uses the local video system in which case this is really confusing
I hope to get some help here and as I understand that it works OK I hope you can wait a bit till I get help :)
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Re: Strange video artifacts

Postby miket on Mon Oct 12, 2009 7:47 am

Hi !

This is almost certainly a video driver problem, try using the mesa driver instead of the ATI driver.

MikeT.
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