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Re: Backport of mesa to Jessie?

On Sat, May 23, 2015 at 01:15:05PM +0200, Cyril Brulebois wrote:
> Vincent Cheng <vcheng@debian.org> (2015-05-23):
> > > Is there a possibility to backport Mesa 10.5.5 to Jessie?
> > >
> > > With the current Mesa version in Jessie, I am unable to use MPV with
> > > opengl-hq and scalers which offers big improvement to the image
> > > quality over the default and similar ones without getting choppy
> > > video playback with my Haswell based Intel GPU. While users of other
> > > distro's which has mesa 10.5.5 reports that the same configuration
> > > of MPV works fine on even slower CPU and GPU from intel.
> > > 
> > > A lot has happened since 10.3 regarding opengl performance in
> > > general which will benefit when playing games and other opengl
> > > applications.  I have seen a few users on debians irc support
> > > channels wanting/needing a newer mesa for playing games.
> Be aware that the X stack has quite a lot of dependencies, and you might
> need to also backport libdrm, and other various x11proto* and lib*
> packages. I've done that for squeeze, it's certainly doable, but can
> take a fair amount of time/patience. :)
> > In general, please either contact the maintainer of the package in
> > question (debian-x@l.d.o) to see if they would be willing to provide a
> > backport, or prepare your own backported package and ask for
> > sponsorship here on the list if you're willing to maintain the
> > backported package yourself (see instructions at [1]) for the lifetime
> > of jessie. If neither of these options are possible, be prepared to
> > wait indefinitely; it's fairly uncommon for folks here on
> > debian-backports to prepare backports on request from others.
> > 
> > (I can't speak on behalf of the mesa maintainers, but I'll point out
> > that the Debian X team is quite small and is unlikely to be willing to
> > backport mesa and maintain/support the backported package themselves.)
> Having stepped down from X maintenance, that's not on my to-do list, but
> I might end up looking into that backporting dance again, should I find
> some interested customer; unless someone does the work beforehands. :)
> Mraw,
> KiBi.


After talking a little bit with upstream about providing newer stable
updates for Debian stable users I suggested that we could provide new
upstream releases of mesa through jessie-backports.
Then I found this existing thread requesting mesa for jessie-backports.
So I'd be interested in backporting mesa to Jessie.

I've already prepared backports of libdrm and mesa in [1] and [2].
The biggest change for backporting mesa is to build against llvm-3.5
instead of llvm-3.7. Thus it needs a few tweaks in debian/rules to
disable llvmpipe on some archs and needs libclc from jessie.
Furthermore mesa needs a newer libdrm backported from testing and needs
to use the already backported libvdpau (thanks vcheng) from jessie-

Since I'm a DM I'd need a sponsor for the initial uploads of libdrm and
mesa to BACKPORTS-NEW. I should be able to handle further uploads myself
once my uid has been added into the backports ACL.


[1] https://anonscm.debian.org/cgit/pkg-xorg/lib/libdrm.git/log/?h=debian-jessie-backports
[2] https://anonscm.debian.org/cgit/pkg-xorg/lib/mesa.git/log/?h=debian-jessie-backports

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