This is somewhat related to this question
For some time now, my system sporadically
- hangs with the sound card playing the previous sample in a loop and sometimes a flickering screen.
- bluescreens with above error code.
This is an HP Elitebook 8740w and I have turned to the HP support for help and to a local HP partner afterward, both in vain.
I'm a driver developer as fellow devs will likely guess by my nickname and I am able to analyze memory dumps (beyond
!analyze -v ...). However, since this is inevitably a hardware issue, I never get a full (uncorrupted) memory dump that gives me more than the bugcheck code itself (
WHEA_UNCORRECTABLE_ERROR) and the fact that parameter 1 is
0x4, making this "An uncorrectable PCI Express error occurred."
The problem is that as of yet I have to get a memory dump with intact contents of the memory to which parameter 2 supposedly points (
WHEA_ERROR_RECORD). Short of any other solution I have now resorted to attaching a debugger via Firewire to the system so I can hope to inspect the memory upon crash.
I have upgraded all drivers to their latest available version, but my suspicion is that this is not a software problem at all. In all cases I watched some kind of video stream, though sometimes they were from hard drive and sometimes from a live stream. HP told me that multiple components on the motherboard are connected via PCI Express and after the local HP partner claimed they couldn't reproduce it (after all it happens sporadically to me as well) and returned it without doing anything.
I need some way of at least tracking down the (hardware) component that causes the fault or better yet a way to trigger the fault myself to demonstrate to them.
Note: it does not appear to have to do with the temperature of the system ("overheating") as most of the time the system was chilling and not under heavy load.