[Bug 102711] high system load and mouse delays - pipe A vblank wait timed out

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102711

Albert Weichselbraun <albert at weichselbraun.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #2 from Albert Weichselbraun <albert at weichselbraun.net> ---
Just in case somebody else runs into this problem. I did some debugging by
comparing the changes between linux v4.12.7 and v4.12.8.

In fact this problem has been triggered by a change in the xhci driver
(drivers/usb/host/xhci-pci.c) which now does a mandatory reset of some xhci
devices.

<snip>
/* For some HW implementations, a XHCI reset is just not enough... */
if (usb_xhci_needs_pci_reset(dev) {
   dev_info(&dev_>dev, "Resetting\n");
   if (pci_reset_function_locked(dev))
       dev_warn(&dev->dev, "Reset failed");
}
</snip>

In my case this seemed to mess up the external USB controller

  USB controller: Renesas Technology Corp. uPD720202 USB 3.0 Host Controller
(rev 02)

and led to the freezes as well as to the error message of the display driver.

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