[Bug 105065] Qt Programs occasionally fail to render with new Mesa (glGetProgramBinary)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105065

--- Comment #4 from Jordan Justen <jljusten at gmail.com> ---
(In reply to Kenneth Graunke from comment #3)
> Although it sounds like this is not our bug,

I think we can upgrade from 'sounds like this is not' to
'it is not'. :)

> I think we ought to revert it
> from 18.0 to give the Qt developers time to patch it and have the fix reach
> distros.  This has the potential to impact a ton of KDE users, and
> completely breaks KMail rendering, which is painful for me personally. 
> Breaking people's basic desktop functionality is something we usually try to
> avoid, if at all possible...

Reverting it will cause a few games to break. Those games were also
not following the spec. (Like QT.)

The impact from QT users will probably be more significant.

But, end users are less likely to be affected because if the version
string changes, then I think they won't try to use the binary. But,
if the distro releases the same version of Mesa more than once, then
there could be issues.

Scott also found that the one app he tested was using compatibility
profile. If basically all QT apps also use compatibility profile,
then not exposing it for compatibility profiles might be another
way to work around the QT bug.

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