https://bugs.freedesktop.org/show_bug.cgi?id=90264
--- Comment #12 from Ilia Mirkin imirkin@alum.mit.edu --- (In reply to Matt Whitlock from comment #10)
Whenever a context menu in Chromium fails to display correctly (shows as solid black instead), the following lines (or similar) are appended to the kernel message log:
nouveau E[chrome[5932]] multiple instances of buffer 249 on validation list nouveau E[chrome[5932]] validate_init nouveau E[chrome[5932]] validate: -22
Does not happen upon display of corrupted tooltips, only context menus.
I suspect you were using libdrm 2.4.60. Use either .59 or .61 and that particular error will go away. That said, I also see the tooltip fail in chrome on a GF108 (nvc0 driver) for a few versions of chrome now.