video memory test
Hi!
I need to test my graphic card memory, because I suspect video memory errors. My LCD shows unclear image (like a distortion effect!) and vertical lines. It also happens connecting my laptop to an external CRT monitor. No problem only working on a Terminal (X server not running). I suppose for the low memory needed. What linux software could I run? |
Member Response
Hi,
Any changes to the system to produce the problem? Or was this a working system then the graphics problem occurred? |
Hi!
The issue appeared suddenly two days ago on a working system. (My laptop has been fully working for six years!! ;)) I noticed a screen corruption/distortion. Initially, I supposed it could be a driver issue so I tried to restart X, but no success. I guess the LCD is ok since the same issue appears connecting the laptop to an the external CRT. I'm looking for a tool like memetest86 but related and specific for video cards. |
Is your laptop video card a Geforce 8000 series?
There were a lot of faulty ones some years ago... |
Member Response
Hi,
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I don't know if the following messages/warnings can be related to this hardware issue, but I've noticed the following: dmesg: Code:
[9.770769] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. Code:
Aug 20 10:50:41 darkstar kernel: [ 91.151741] NMI: PCI system error (SERR) for reason a1 on CPU 0. Whenever I echoed the "/sys/class/drm/card0/device/power_profile" by entering one of the [auto], [default], [mid] or [low] profiles, I've always got the NMI error message: Code:
echo low > /sys/class/drm/card0/device/power_profile I've found out "VMT"-Video Memory Test: http://vmtce.sourceforge.net/. It's a an opensource project under the GPL License. I will try to test my video memory. |
If the same effect happens with an external monitor then it probably is the graphics card.
I guess you could try a live CD and see if it happens there to exclude broken drivers on your current distro. |
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The VMT test results report several video memory errors. :( I burned the VMT iso image on a boot cd. Powering on the laptop, VMT prints on screen several of these warnings: Code:
I/O card parity interrupt at 2775:3E88 Code:
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Thanks for the VMT utility, I didn't know about it and will probably need it for my main machine as it has been having some issues.
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