On 05/12/2015 05:12 AM, Mark Brown wrote:
On Mon, May 11, 2015 at 08:26:58PM +0200, Dominik Brodowski wrote:
Also CCing Matthew who came up with the original version of the version
change and Liam who is one of Intel's audio experts.
According to an off-list discussion, the sound breakage (and not just some
jack detection issue) seems to be caused due to alsa-lib being too old.
Right, it needs the userspace configuration files installing.
Is it just configuration files? With 4.1-rc3 I've not been able to get sound working mucking with any mixers.
The matter is further complicated by the issue that the driver
asks for some firmware blob intel/IntcPP01.bin which (at least) I
cannot find anywhere.
As previously advised that firmware is optional.
The errors in dmesg make it seem like that was related to the firmware missing, but that is a red herring it sounds like.
Under the no-regression rule, this means that either b1ef29725865 needs
to be reverted or we need to find another solution to this matter, such as
an override. And I think it is needed for longer than just for 4.1, as it
will continue to be cause regressions on quite recent userspace.
Does this also affect other behaviour of the system? I'd be pretty
unhappy if it introduce power regressions for example, I mostly don't use
audio on my laptops but I care a lot about how long it'll run
disconnected. It *is* quite a new laptop and my experience installing
was very much that it was in bringup (though quite a bit of this was
userspace).
I just tried it with 4.1-rc3 from Ubuntu's mainline PPA and an Ubuntu 15.04 userspace. It does affect the behavior of the system. See all the PCM errors in dmesg:
https://bugzilla.kernel.org/attachment.cgi?id=176511
At least with BIOS A03 (latest), Ubuntu 15.04 (3.19ish and modern userspace) or with 4.0 and recent userspace the experience shouldn't be bringup.
Keyon,
There is a bug opened at https://bugzilla.kernel.org/show_bug.cgi?id=93361. I've added updated notes to this for 4.1-rc3 experience.
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