[Bug 100725] [i915] oops in intel_update_cursor_plane(): "BUG: unable to handle kernel NULL pointer dereference"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100725

--- Comment #4 from David H. Gutteridge <dhgutteridge at hotmail.com> ---
I tried testing with the drm-intel-nightly branch cloned the evening of July
7th, but this has proven unusable for me for an unrelated reason: the mouse
cursor ends up being stuck permanently rendered in its initial position. That
is, the underlying mouse movement is registered (regardless of trackpad or
mouse, X.org or Wayland) on the screen, with GUI components reacting as the
mouse position changes, but the cursor itself never moves. (The config I'm
using is basically what's used by Fedora, since I need various options enabled
for the laptop in question to be usable. The default config in
drm-intel-nightly wasn't adequate for that.)

I've also tried testing with a downstream Fedora build of the 4.12 kernel,
which doesn't exhibit the frozen mouse cursor problem. I haven't been able to
duplicate this original issue yet with that kernel, though I haven't had time
to put in as much use as I'd like. (It typically happened under memory pressure
after the machine was up at least a few hours.) (I compared output with
drm.debug enabled between the drm-intel-nightly and Fedora kernels, and I don't
see anything to indicate why the mouse pointer problem is happening.) I can
continue testing with the Fedora kernel if that's still relevant here. (I also
have a build of the vanilla 4.12 kernel I can try if need be. I'm not remotely
familiar with the Intel kernel branches, but I also found the test kernel I
built from drm-intel-nightly panics on boot when I use it in a VM, where the
vanilla kernel does not. In that case, it relates to the qxl driver, which
might not be of interest on an Intel branch.)

Anyway, in short, this hasn't been a simple exercise.

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