On Tue, Apr 09, 2013 at 15:25:15 -0700, chris hermansen wrote: > Torstein, list; > > On Tue, Apr 9, 2013 at 12:34 AM, Torstein Hegge <hegge@xxxxxxxxxxx> wrote: > > On Mon, Apr 08, 2013 at 18:28:30 -0700, chris hermansen wrote: > [..] > >> Hmm that was a bit of a slip of the brain. Anyway, I'm actually back > >> in the same general vicinity as the Bifrost and can do some more > >> testing. > >> > >> Torstein, is there anything specific you want me to try, or just patch > >> up the kernel and have at it? > > > > The latest iteration of the patch is included in the 3.9-rc6 kernel. You > > can try a plain 3.9-rc6 kernel without any modifications. > > So, I've updated my aging Toshiba "test bed" to the latest Ubuntu > 13.04 release and grabbed the 3.9-rc6 kernel from > http://kernel.ubuntu.com for testing. > > Trying out a bunch of songs with no noise, that's great news! But now > something else seems weird. > > When I play a 96/24 file through plughw corresponding to the Schiit, I see this: > > [...] > > Ie the 24bit data is getting downsampled to 16 bits! > > It also seems like "stream0" for the Schiit only plays back 16bit data > > cat stream0 > CMEDIA Schiit USB Interface at usb-0000:00:13.2-3, high speed : USB Audio > > Playback: > Status: Stop > Interface 1 > Altset 1 > Format: S16_LE > Channels: 2 > Endpoint: 5 OUT (ASYNC) > Rates: 44100, 48000, 88200, 96000, 192000 > Data packet interval: 125 us > > [...] > > Also this stream0 looks markedly different than the version I > displayed back on 3 March. It looks like the Interface 1, Altset 2 is missing, with the 3.8.0 kernel you had another Altset, Interface 1 Altset 2 Format: S32_LE Channels: 2 Endpoint: 5 OUT (ASYNC) Rates: 44100, 48000, 88200, 96000, 192000 Data packet interval: 125 us What does dmesg / /var/log/kern.log say when you plug in the device with the v3.9-rc6 kernel? Torstein ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
