(In reply to Ilia Mirkin from comment #12)
> (In reply to Matt Whitlock from comment #10)
> > nouveau E[chrome[5932]] multiple instances of buffer 249 on validation list
> > nouveau E[chrome[5932]] validate_init
> > nouveau E[chrome[5932]] validate: -22
> 
> 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.

Thanks! I was indeed using libdrm 2.4.60. Downgrading to 2.4.59 solved the
problem of the solid black menus, so at least my Chromium is usable again, but
I still have corrupted tooltips sometimes.