https://bugs.freedesktop.org/show_bug.cgi?id=90264
--- Comment #18 from Furkan falaca@gmail.com --- I'm using Chrome 43.0.2357.124 (latest stable version).
I installed the latest Chromium build from the Ubuntu repo, which is 43.0.2357.81. However, going to chrome://gpu shows that everything is "software only" (so the tooltips work fine).
Might be worth taking a look if maybe going from one version to the other caused you to switch from software only to hardware-accelerated?
You mentioned the issue happened when you upgraded from 43.0.2357.73 to 44.0.2403.18. So I checked out this URL:
https://chromium.googlesource.com/chromium/src/+log/43.0.2357.73..44.0.2403....
And surely enough: https://chromium.googlesource.com/chromium/src/+/4c9c8b2238012338a6395f7101d...
"Enable hardware acceleration for Nouveau and Stage3D".