opengl fails with alpha on Ubuntu 16.04

[totaam]

Issue migrated from trac ticket # 2203

component: client | priority: major | resolution: fixed

2019-03-12 02:41:27: antoine created the issue

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Tested as part of #2198, the client output shows:

Error presenting FBO:
 XError: BadMatch

Turning off alpha with XPRA_ALPHA=0 xpra attach.. causes it to segfault instead!

[totaam]

2019-03-12 02:42:03: antoine uploaded file glinfo.txt (5.5 KiB)

gl info collected on Ubuntu 16.04 with virtualbox 3D enabled

[totaam]

2019-03-12 02:55:19: antoine changed status from new to closed

[totaam]

2019-03-12 02:55:19: antoine set resolution to fixed

[totaam]

2019-03-12 02:55:19: antoine commented

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What happens here is that the latest driver now passes the gl feature and sanity checks, but still crashes at runtime, so r22054 re-adds "VMWare, Inc." to the blacklist.

A better solution is now in #2204.