I am going to verify more of this but in the meantime, I will need to get the following information:
- Is this happening when connecting an external monitor only?
- is this error a BSOD?
- Can you attach here your dxdiag report?
thanks for looking into this. Regarding your questions:
- It happens reproducibly when I connect an external VGA monitor for the first time. I haven't seen this happen at other occasion, i.e. bad RAM or CPU is most definitely not the issue here.
- No it is not a BSOD. As mentioned in the original post, Windows 7 runs in a virtual machine environment (with direct access to the IGD hardware, though). The exception shows up in the VMM host and generates a trap there. The VMM software is not something that is available to the general public at this time.
- I'll get back to you with a dxdiag report tomorrow. However, I'm not confident that it will be of much use given that the problem happens outside of windows.
Thanks for the information. It is Indeed a strange situation. As you say this not hardware level issue but a graphics driver issue. At this point I am searching for what can be the cause but in the meantime, can you please provide images? I would really like to know how the graphics adapter is shown under Device Manager (Under Virtual machine Operating System).
I'm not sure I understand you correctly. Do you want me to open the graphics device in the Windows device manager and screenshot the results? If so, which tabs and views are you interested in? Note that the screenshots will show text in german, i.e. it is probably better if I try to extract the information manually....
Here's some of the information in text form:
- Intel(R) HD Graphcis 4600 connected to PCI-Bus 0, Device 2, Function 0.
- Latest intel beta driver (other drivers don't seem to make a diffence though):
- Driver date: 2014/06/16
- Version: 10.18.10.3652
- MMIO (BAR): at 00000000FE400000 - 00000000FE7FFFFF
- MMIO (BAR): at 00000000E0000000 - 00000000EFFFFFFF
- I/O Ports: at C080 - B0BF
- IRQ: 0x16 (decimal 22)
- Legacy VGA: I/O Ports at 03B0 - 03BB
- Legacy VGA: I/O Ports at 03C0 - 03DF
- Legacy VGA: MMIO at A0000 - BFFFF
- No resource conflicts detected.
- Additional HW resources that are accessible in the virtual machine at their native locations but not really shown in the device manager:
- BIOS operation region
- VGA stolen memory
- Several graphics related PCI config space registers in device 00:00.0.
- Let me know which properties from the "Details" tab might be interesting.
One thing that might be triggering unusual code paths in the VMM driver is the fact that the VM simply hides MSI/MSI-X capabilities of the graphics card, i.e. the graphics driver has to fall back to the legacy IRQ.
Some additional information regarding the setup that might be of help:
- I have complete source code for the VMM host software. I can do modifications in order to extract interesting information if that is of any help.
- The VMM host software traps into the kernel debugger at the time of the exception, i.e. I can extract interesting information from there, too.
- AMT is configured and a serial console is active for debugging purposes. However, I'm pretty sure that the crash happens with AMT disabled, too.
- I can continue the machine after the machine check exception. If I disconnect the VGA adapter Windows is sometimes able to recover from the situation (by terminating and restarting the driver). No output shows up on the external screen.
Do you have any information on the exact meaning of the error code given in the original message?