On Thu, 16 Nov 2017 06:53:37 +0100, VDR User wrote:
Ok, after doing a git bisect on the kernel tree, I wound up with:
41eb94fd26f6c150b0460e01ecc84d643355f9b6 is the first bad commit commit 41eb94fd26f6c150b0460e01ecc84d643355f9b6 Author: Vinod Koul vinod.koul@intel.com Date: Fri Mar 4 20:25:30 2016 +0530
ALSA: compress: fix some typosSo, something must have went wrong because that commit is just spelling and grammar fixes in comments.
Yeah, that's very unlikely.
How can I do a git bisect for just sound/ instead of the whole kernel? I assume I'd have to clone the kernel, delete sound/, then clone the alsa dev git sound/ in its place? It should be easier to git bisect in alsa, then simply recompile modules, install, load, test, and repeat until I find the offending commit right?
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
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!