On Monday 02 May 2011 17:04:11 Kevin Kofler wrote: > Martin Gräßlin wrote: > > This is now a little bit surprising for me as it was a Fedora developer > > who urged me into raising the requirements. In fact I was even asked to > > raise it for the next minor release as a bugfix. > > Uh, I never asked you to up the Mesa requirement to 7.10. The minimal change > to check for "Intel" instead of "GEM" in kwinglcheck (which is the patch I > applied in the Fedora 15 kdebase-workspace package) only raises the > requirement to something much lower. true, but in the end I considered that we can only support Mesa 7.10, given that we know about the problems with 7.9 and 7.8. So if adding a requirement I thought doing a proper one, where we know that it works quite decent and it matches what the Mesa devs want us to do anyway. > I don't know the exact version (we'd have > to check the history), but the Intel driver has been DRI2 for years! well it also has to perform decent with direct rendering enabled and that is only since about 7.8/7.9. > And Adam > Jackson (also a Fedora developer) suggested cleaner ways to check whether > direct rendering will work, which (as far as I know) will also work fine on 7.9 > and probably several older releases. There's a middle ground between > supporting everything ancient and requiring the very latest. We tried to support more than the most recent release and it broke badly. I think we will no longer be able to support more than one driver release and I will consider to raise the requirements with 4.8 again. We simply don't have the manpower to ensure that it is working with older drivers - especially if they can introduce regressions in minor releases :-( > > And by the way, your new check (which assumes that Mesa == DRI2) is also > incorrect for Mesa 7.10 because DRI1 drivers still exist (e.g. i810/i830 > legacy). Without access to the hardware we will never know whether this works or not. It is as possible that another check disables direct rendering or that the hardware is too old in general to properly support OpenGL compositing. > E.g. Fedora 15 still ships them (and it has a Mesa 7.11 snapshot), > only Fedora 16 will drop them. Some distros might keep them for even longer. > > That said, we will probably not upgrade Fedora 14 to 4.7 anyway. We have been > doing only one KDE SC upgrade per Fedora release (i.e. offering the latest KDE > SC only on the latest Fedora) since Fedora 12. We may (or may not) be doing > unofficial packages though, and we may end up having to patch your OpenGL > checking code to make them work. :-( Which is probably the better way as you know which Mesa version is used. Cheers Martin Gräßlin
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