[Bug 97558] [Broadwell] VGA projection system not detected as of Linux 4.7 (but fine before then)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97558

--- Comment #18 from Gwendal <c86rc9-9snbcbobzdzipkvbcg_freedesktop at bousse.fr> ---
(In reply to Gwendal from comment #16)
> (In reply to Gwendal from comment #15)
> > Hello,
> > 
> > I have the same problem (I think): beamers were working perfectly fine until
> > a system update weeks ago.
> > 
> > My configuration:
> > - Fedora 25 beta (but the problem was there with F24 as well)
> > - 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
> > Integrated Graphics Controller (rev 0b)
> > - linux 4.8.4-301.fc25.x86_64
> > 
> > Regular Iijama monitors work fine in VGA (both the one I have at home and
> > the one from my office, which is a Prolite XB2485WSU).
> > 
> > However beamers (rather old, which is typical in universities) do not work
> > in VGA: nothing detected with xrandr or anything else. I have this situation
> > with two different beamers.
> > 
> > If I can provide more information, please do not hesitate to ask!
> > 
> > Thanks! Regards
> 
> I forgot to mention my CPU name:
> 
> - Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz
> 
> Also, a recent possibly related bug:
> https://bugs.launchpad.net/ubuntu/+source/linux-lts-xenial/+bug/1619677

OK, I've just tested on the same system with an older kernel 4.6.0, and it
works again using VGA on the same old beamer that didn't work in 4.8.4.

On Fedora 25 beta I used koji to install 4.6:

$ wget
https://kojipkgs.fedoraproject.org//packages/kernel/4.6.0/1.fc25/x86_64/kernel-4.6.0-1.fc25.x86_64.rpm
https://kojipkgs.fedoraproject.org//packages/kernel/4.6.0/1.fc25/x86_64/kernel-core-4.6.0-1.fc25.x86_64.rpm
https://kojipkgs.fedoraproject.org//packages/kernel/4.6.0/1.fc25/x86_64/kernel-modules-4.6.0-1.fc25.x86_64.rpm
$ sudo rpm -ivh --oldpackage ./kernel-4.6.0-1.fc25.x86_64.rpm
./kernel-core-4.6.0-1.fc25.x86_64.rpm ./kernel-modules-4.6.0-1.fc25.x86_64.rpm

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