What you can try is to bisect like git bisect start -- sound/hda sound/pci/hda git bisect good v4.5 git bisect bad v4.6-rc1
Ok, did more bisect'ing. I had to skip a commit because the compile failed but other than that, this is what I wound up with:
git bisect start '--' 'sound/hda' 'sound/pci/hda' # good: [fe0d128c57bf927a713159f60a18d9f315d4d91d] ALSA: jack: Allow building the jack layer without input device git bisect good fe0d128c57bf927a713159f60a18d9f315d4d91d # bad: [9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0] ALSA: hda - Register chmap obj as priv data instead of codec git bisect bad 9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0 # skip: [d61b04f801e6005182d432ebe4a0211c1d6feadd] Merge branch 'for-linus' into for-next git bisect skip d61b04f801e6005182d432ebe4a0211c1d6feadd # good: [ec75a940b1037e877efd9a5a9e94eab1e464f73b] ALSA: hda - hdmi add wmb barrier for audio component git bisect good ec75a940b1037e877efd9a5a9e94eab1e464f73b # good: [d10a80de04a3a8c0d7c1567cbc0a8d2e1181c10a] ALSA: hda - hdmi_find_pcm_slot return value bug fix git bisect good d10a80de04a3a8c0d7c1567cbc0a8d2e1181c10a # good: [6defb60ae4ffe92c29291ed49695daa255b8f559] Merge branch 'for-linus' into for-next git bisect good 6defb60ae4ffe92c29291ed49695daa255b8f559 # good: [67b90cb84be8fde0e51f71834e15c32fbec08562] ALSA: hda - Create common chmap object git bisect good 67b90cb84be8fde0e51f71834e15c32fbec08562 # first bad commit: [9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0] ALSA: hda - Register chmap obj as priv data instead of codec
9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0 is the first bad commit commit 9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0 Author: Subhransu S. Prusty subhransu.s.prusty@intel.com Date: Fri Mar 4 19:59:47 2016 +0530
ALSA: hda - Register chmap obj as priv data instead of codec
With this chmap object is added as private data and new ops are added to access driver specific chmap.
Signed-off-by: Subhransu S. Prusty subhransu.s.prusty@intel.com Signed-off-by: Vinod Koul vinod.koul@intel.com Signed-off-by: Takashi Iwai tiwai@suse.de
:040000 040000 11dc1a68fd79182d4e38c2a7fd73fd699dbd0685 69c05f445bc255fc02441742b091247af99fb177 M include :040000 040000 8946088a30757dfcbc1ea6badbe6ea8366b2b39f 6fcf7ce7986ffd29d3b5686ebe63168713b866ed M sound
Does this sound like it could be where the bug resides?. I created a patch with `git format-patch -1 9b3dc8aa3fb1a5f38ca9501f20f6ea4dced10fa0` and tried to apply it to kernel 4.6-rc1 but I failed. I didn't bother trying to hand-reverse it because it looks like it would just cause breakage. Not sure what to do next here so I'll wait and see what you think..
-Derek
This will concentrate only on commits in sound/hda/* and sound/pci/hda/*. You have to be careful about the kernel version to be built eventually jumping back and forth, and remember which one is installed and rebooted/retested. I usually put a different suffix string to CONFIG_LOCALVERSION at each build or set CONFIG_LOCALVERSION_AUTO to put the git commit id.
Takashi
On Wed, Nov 15, 2017 at 8:34 AM, VDR User user.vdr@gmail.com wrote:
It just tried kernel 4.6-rc1 and the problem is present there as well. Is there a list of patches between stable kernel 4.5.7 and 4.6-rc1 somewhere? I can try to revert each of them one at a time if so. Unless someone has any better idea to narrow this down to the offending commit?
There were a significant amount of changes between 4.5 and 4.6 regarding HD-audio HDMI/DP due to DP-MST support and the movement of chmap stuff into sound/hda.
Both can be a culprit...
For checking the former, could you try the following?
Checkout 4.5.7 git branch
merge (not cherry-pick) the commit 022f344b41a5 % git merge 022f344b41a5
This will bring DP-MST changes on top of 4.5.7.
Then build this and check whether it shows the problem. If yes, you can easily bisect between 4.5.7 and here. If it doesn't show a problem, the problem is in the rest changes in 4.6-rc1.
Hi Takashi,
I did: git clone https://github.com/torvalds/linux.git cd linux git checkout 022f344b41a5
After compiling, audio is working correctly with that commit: ~$ speaker-test -c 6 -t wav
speaker-test 1.1.3
Playback device is default Stream parameters are 48000Hz, S16_LE, 6 channels WAV file(s) Rate set to 48000Hz (requested 48000Hz) Buffer size range from 64 to 5440 Period size range from 32 to 2720 Using max buffer size 5440 Periods = 4 was set period_size = 1088 was set buffer_size = 5440 0 - Front Left 4 - Front Center 1 - Front Right 3 - Rear Right 2 - Rear Left 5 - LFE Time per period = 8.526391
Do you happen to known which commit I can try next that *should* have the problem so I can git bisect from there?
Thanks!