<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - GF117: MMIO write of 0000001f FAULT at 6013d4 [ IBUS ]" href="https://bugs.freedesktop.org/show_bug.cgi?id=108980#c5">Comment # 5</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - GF117: MMIO write of 0000001f FAULT at 6013d4 [ IBUS ]" href="https://bugs.freedesktop.org/show_bug.cgi?id=108980">bug 108980</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>This is quite confusing. It would appear it's happening in volt's oneinit function: [ 17.475047] kernel: nouveau 0000:08:00.0: volt: init running... [ 17.475749] kernel: nouveau 0000:08:00.0: volt: one-time init running... [ 17.476499] kernel: nouveau 0000:08:00.0: volt: couldn't find speedo value, volting not possible [ 17.476513] kernel: nouveau 0000:08:00.0: bus: MMIO write of ffff881f FAULT at 6013d4 [ IBUS ] [ 17.477150] kernel: nouveau 0000:08:00.0: volt: one-time init completed in 668us [ 17.478504] kernel: nouveau 0000:08:00.0: volt: current voltage unknown [ 17.479174] kernel: nouveau 0000:08:00.0: volt: init completed in 3426us However nothing in there could cause that... of course the notification only comes in later (via interrupt servicing), so it may not be directly correlated to these messages. Auditing the other common suspects, nothing in the bios will try to use any of the IO/etc commands which generally trigger these. AHA! I have a theory. devinit's preinit calls nvkm_lockvgac(). Can you try commenting that out? drivers/gpu/drm/nouveau/nvkm/subdev/devinit/base.c:nvkm_devinit_preinit -- just comment out the call to "nvkm_lockvgac". If that doesn't help, then I'm out of ideas, and we have to take more of a shotgun approach -- add a WARN() at the top of drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c:nvkm_wrport and rdport, and see who's calling them. No one should be on a GF117, I believe.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>