[alsa-devel] commit b1ef29725865 (ACPI _REV=2) causes sound regression on Dell XPS 13 [Was: Discussion around quirking the _REV behavior for the XPS 13 (2015) until 4.2]

[Mark Brown]

On Tue, May 12, 2015 at 10:21:41AM -0700, Matthew Garrett wrote:

> Since there's no way to get this working without using new userspace,
> we're basically stuck with having to support _REV 5. And since we're
> supposed to support old userspace basically forever, this isn't going
> to be something that we can just remove in a few months. But since the
> hardware is intended to be used in I2S mode, we don't want this quirk
> to be there forever. So we're basically left with adding
> CONFIG_ACPI_WORKAROUND_BROKEN_DELLS which enables the quirk, default
> it to Y and then let distributions set it to N when they've got
> sufficiently new userspace. Unless someone has a better plan?

That makes sense to me given that the firmware doesn't seem to do
anything problematic in Linux mode - hopefully we won't have too many
more of these systems to contend with.
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