Michał Mirosław wrote:
As I found out from EDAC driver sources for i82875P some BIOSes for i82875P/PE hide 'overflow' device 6. The same thing happens for i82865P/PE chipsets. After testing this patch for couple of days on my laptop (i82856P) it looks like something is resetting device 0 (MCH) config register 0xF4 to zero and effectively disabling the device again. The delay looks random to me. I can easily update the register using 'hexedit /sys/bus/pci/devices/0000\:00\:00.0/config' and see correct values in lspci output afterwards.
Could be the BIOS is using the device in SMI code or something (and that's what disables it), therefore it may be unsafe to unhide this device.
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