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List:       kde-bugs-dist
Subject:    [kwin] [Bug 252817] KWin crashes on intel/mesa glClear(GL_COLOR_BUFFER_BIT)
From:       Thomas Lübking <thomas.luebking () gmail ! com>
Date:       2013-07-28 19:25:55
Message-ID: bug-252817-17878-VXyWpHz8SB () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=252817

--- Comment #206 from Thomas Lübking <thomas.luebking@gmail.com> ---
(In reply to comment #205)
> (In reply to comment #204)
> > Actually that would make the solution *extremely* simple: have SDL1 tag the
> > window as "_NET_WM_BYPASS_COMPOSITOR", "1" - problem solved.
> AFAIK SDL 1 reached end of life - there won't be any official updates.
> Actual problem with legacy code is here, not with "false positives".
No, false positives is what you'll get on your approach - proof: the cause for
this discussion.

> Your "fix" causes regression for me. Isn't it a bad fix?
It's not a fix, thus not a bad fix.
It's a trade-off: we've a feature that will either get you less performance
boost than another feature - or crashes.

Then what's the "regression"?
You suspend compositing instead and get 3 more extra fps in your shooter?

If you can work around the problem in a way so that we do no more get a "help,
kwin crashed after checking this" bugreport about every week, i'll happily vote
for that solution.

inb4: If your solution is "disable it by default and remove the config GUI",
you're asking for a single target ("you") solution - and i'm dead sure the
"secret command to make kwin faster" will show up pretty fas as well - with
known consequences.

> Also, you've disabled all Intel cards, while the problem may be specific to
> i915g driver or older mesa versions.

It seems Sandybridge is affected by the same root cause (see comment #17 and
comment #43) and it seems Ubuntu/Compiz meanwhile figured this happens =)
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/947544

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