Various issues with Intel Drivers for KWin in Kubuntu 12.10

[Martin Gräßlin]

Hi Kubuntu-Developers,

please note: I'm not subscribed, please CC me in replies

I just wanted to inform you (in case you are not yet aware of it) that we in 
KWin started to receive a bunch of bug reports for Kubuntu 12.10 in the 
combination with the Intel drivers since this weekend.

The issues are:
* crashes (e.g. Bug #308369)
* performance problems (e.g. Bug #308385)
* rendering issues (e.g. Bug #308439)

So far we do not have enough data to say whether there is a real and general 
issue, but I'm concerned enough to send this mail.

What we know is that the issues are related to Mesa 9.0 which got released 
just last week. Several users told us that downgrading to Mesa 8 the problems 
go away (of course not an option for Kubuntu users).

My recommendation would be to put a word of warning into the release note. I 
find the situation very difficult as I neither want you to warn about a 
problem that does not exist, on the other hand I don't want users to run into 
the issue and then blaming KDE for bad performance.

Also for the next cycle I would recommend to try to increase the timespan 
between Mesa driver releases and the release of Ubuntu. I don't think it's a 
good idea to ship a new Mesa version before the rolling release distributions 
have played guinea pig ;-)

Best Regards
Martin Gräßlin
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