Originally Posted by onebuck
Look at your logs in '/var/log', especially 'Xorg.0.log' & dmesg for errors or warnings. For diagnostics I would look at the manufacture sets.
I don't know if the following messages/warnings can be related to this hardware issue, but I've noticed the following:
[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.
Aug 20 10:50:41 darkstar kernel: [ 91.151741] NMI: PCI system error (SERR) for reason a1 on CPU 0.
Aug 20 10:50:41 darkstar kernel: [ 91.151749] Dazed and confused, but trying to continue
Aug 20 15:18:29 darkstar kernel: [ 851.465482] NMI: PCI system error (SERR) for reason b1 on CPU 0.
Aug 20 15:18:29 darkstar kernel: [ 851.465488] Dazed and confused, but trying to continue
doesn't report anything related to it.
Whenever I echoed the "/sys/class/drm/card0/device/power_profile"
by entering one of the [auto], [default], [mid]
profiles, I've always got the NMI error message:
echo low > /sys/class/drm/card0/device/power_profile
Uhhuh. NMI received for unknown reason a1 on CPU 0. You have some hardware problem, likely on the PCI bus.
Dazed and confused, but trying to continue
Today I've tried again to echo the "power_profile" but I've got a blank screen display and a system freeze (no MagicSysRq, no Ctrl+Alt+Fn, ....). I had to press the power-off button.
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.