[Bug 63981] MacBook Pro retina 13 inch early 2013 jittery display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63981

--- Comment #8 from Daniel Llewellyn <diddledan at gmail.com> ---
Hi, sorry for the delay in responding.

Ubuntu 13.10 does not exhibit the behaviour I describe above from 13.04.

The kernel I'm now running is from a copy of Ubuntu 13.10 which was installed
fresh today and is fully-updated as of a few hours ago. uname -r reports the
kernel is 3.11.0-13-generic which is from Ubuntu's standard "saucy"
repositories.

I believe the issue as originally reported only manifested itself when the wifi
adapter (an integrated Broadcom BCM4331 802.11a/b/g/n) was set to enabled in
the network-manager AND associated with a wireless network. Just being enabled
was not enough to cause the problem, IIRC, but the problem immediately arose as
soon as the wifi was associated with a base-station.

lspci on Ubuntu 13.10 currently reports that the Broadcom wifi is using the wl
kernel module, and Ubuntu's "Software & Updates applet -> Additional Drivers"
says the wifi is using the bcmwl-kernel-source proprietary package.

packages.ubuntu.com shows that the bcmwl-kernel-source has had a version change
between 13.04 and 13.10 releases of Ubuntu, which may account for the different
behaviour:

* raring (13.04): 6.20.155.1+bdcom-0ubuntu6
* saucy (13.10): 6.30.223.141+bdcom-0ubuntu1

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