[virglrenderer-devel] Strange graphical glitches under virgl.

Gurchetan Singh gurchetansingh at chromium.org
Fri Jul 20 21:28:13 UTC 2018

On Fri, Jul 20, 2018 at 2:21 PM Lepton Wu <lepton at chromium.org> wrote:
> Hi,
> I have an issue which I recorded a video  to show the bug:
> https://youtu.be/ECGDCMAOTxs
> You can see, sometimes, there is a "wrong block" of rendering. It's
> always some kind of rectangle somewhere.
> A strange part is: I've never seen this kind of issue if I am running
> 3D android games under virgl. Games always
> running fine. But for Chrome, it sometimes come with this kind of
> weird graphics.
> So I have 2 questions:
> 1.  What kind of guest are you using to test virgl?  I am trying to
> test some other guests to see if I can reproduce
> same issue so I can confirm if this is something specific to my guest
> (Chrome OS).

Most people use Ubuntu VMs.  It's a bit of work to setup -- I'll add
some instructions to "Virgl tips and tricks" document and upload a VM
to the cloud.

> 2.  Do you have any rough idea that this is actually some fixed bug
> upstream somewhere?  I am using TOT virglrenderer + TOT qemu.
> But my mesa (mesa-18.1_pre1) and linux kernel (4.4) in guest which
> could be a little outdated.
> Thanks for your help!
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