[Webkit-unassigned] [Bug 168964] [GTK] Completely garbled display in GMail

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168964

--- Comment #29 from Sergio Villar Senin <svillar at igalia.com> ---
(In reply to Adrian Perez from comment #28)
> (In reply to Sergio Villar Senin from comment #27)
> > I think this issue is more serious than just a couple of sites not working.
> > I'm getting garbled displays very often, like 10 times a day. Sometimes the
> > contents of some tabs are mixed with the contents of some others that were
> > previously closed.
> > 
> > Some other times navigating to another webpage does not refresh the previous
> > render. Hit testing works because the cursor changes but the previous page
> > is still shown.
> > 
> > :(
> 
> Could you add a comment with the kind of GPU you have, and the versions of
> the related packages (Mesa, libdrm, video driver, etc)? So far the issue
> seems to be reproducible only with Intel Sandybridge GPUs, and with Mesa's
> software rendering. The more we can confirm that the issue affects only
> certain hardware/software combinations, it can make it easier to try and
> debug the issue. Thanks!

It's happening also with Kaby Lake

libwebkit2gtk-4.0-37 2.16.6-1 
mesa 13.0.6-1+b2
libdrm-intel1 2.4.81-2
Linux 4.11.0-1-amd64

$ glxinfo
...
direct rendering: Yes
...
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) HD Graphics P630 (Kaby Lake GT2)  (0x591d)

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