#reboot -to last bad commit from the bisect: (my 'robo10', i.e.
3.7.0-rc2-robo10+)
log:
git bisect start
# good: [8966961b31c251b854169e9886394c2a20f2cea7] Merge tag 'staging-3.8-rc1'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect good 8966961b31c251b854169e9886394c2a20f2cea7
# bad: [98c35534420d3147553bd3071a5fc63cd56de5b1] USB: chipidea: fix use after
free bug
git bisect bad 98c35534420d3147553bd3071a5fc63cd56de5b1
# good: [f4a75d2eb7b1e2206094b901be09adb31ba63681] Linux 3.7-rc6
git bisect good f4a75d2eb7b1e2206094b901be09adb31ba63681
# bad: [3a3f2e50951faaac1c67b5c6c0c70dec5b150e9b] Merge tag 'musb-for-v3.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next
git bisect bad 3a3f2e50951faaac1c67b5c6c0c70dec5b150e9b
# bad: [596d789a211d134dc5f94d1e5957248c204ef850] USB: set hub's default
autosuspend delay as 0
git bisect bad 596d789a211d134dc5f94d1e5957248c204ef850
# bad: [e223a4cca70fb6d3954abab7e96a5f54d64d79d4] MIPS: Alchemy: use the OHCI
platform driver
git bisect bad e223a4cca70fb6d3954abab7e96a5f54d64d79d4
# bad: [2be350fafe3fe09765026f41d250dc5d3f000b1a] MIPS: Alchemy: use the ehci
platform driver
git bisect bad 2be350fafe3fe09765026f41d250dc5d3f000b1a
# bad: [6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c] OHCI: implement new semantics
for URB_ISO_ASAP (robo10)
git bisect bad 6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c
# good: [72675479925f53af051ae8a78bcfafeaa47b3eef] EHCI: replace mult/div with
bit-mask operation
git bisect good 72675479925f53af051ae8a78bcfafeaa47b3eef
# good: [72675479925f53af051ae8a78bcfafeaa47b3eef] EHCI: replace mult/div with
bit-mask operation
git bisect good 72675479925f53af051ae8a78bcfafeaa47b3eef
# good: [4005ad4390bf698e3bdae9567e79242ec0584097] EHCI: implement new
semantics for URB_ISO_ASAP
git bisect good 4005ad4390bf698e3bdae9567e79242ec0584097
# good: [c44b225077bb1fb25ed5cd5c4f226897b91bedd4] UHCI: implement new
semantics for URB_ISO_ASAP
git bisect good c44b225077bb1fb25ed5cd5c4f226897b91bedd4
$ git bisect view
... (as1614) ...
After reboot:
1$ sudo modprobe usbmon
1$ uname -vir
3.7.0-rc2-robo10+ #12 SMP Tue Jul 23 12:43:45 CEST 2013 x86_64
Following https://www.kernel.org/doc/Documentation/usb/usbmon.txt:
($ sudo mount -t debugfs none_debugs /sys/kernel/debug
mount: none_debugs already mounted or /sys/kernel/debug busy
mount: according to mtab, none is already mounted on /sys/kernel/debug)
$ sudo modprobe usbmon
$ sudo sudo ls /sys/kernel/debug/usb/usbmon
0s 0u 1s 1t 1u 2s 2t 2u 3s 3t 3u 4s 4t 4u 5s 5t 5u
$ sudo cat /sys/kernel/debug/usb/devices
...
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.00 Cls=ff(vend.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0e41 ProdID=4151 Rev= 0.01
S: Manufacturer=Line 6
S: Product=UX2
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=498mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=line6usb
E: Ad=01(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms
E: Ad=82(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms
I: If#= 0 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=line6usb
E: Ad=01(O) Atr=01(Isoc) MxPS= 192 Ivl=1ms
E: Ad=82(I) Atr=01(Isoc) MxPS= 200 Ivl=1ms
I:* If#= 0 Alt= 2 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=line6usb
E: Ad=01(O) Atr=01(Isoc) MxPS= 180 Ivl=1ms
E: Ad=82(I) Atr=01(Isoc) MxPS= 188 Ivl=1ms
I: If#= 0 Alt= 3 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=line6usb
E: Ad=01(O) Atr=01(Isoc) MxPS= 288 Ivl=1ms
E: Ad=82(I) Atr=01(Isoc) MxPS= 300 Ivl=1ms
I: If#= 0 Alt= 4 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=line6usb
E: Ad=01(O) Atr=01(Isoc) MxPS= 270 Ivl=1ms
E: Ad=82(I) Atr=01(Isoc) MxPS= 282 Ivl=1ms
I:* If#= 1 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
I: If#= 1 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=87(I) Atr=03(Int.) MxPS= 8 Ivl=8ms
...
$ lsusb
...
Bus 002 Device 002: ID 0e41:4151 Line6, Inc.
...
$ sudo cat /sys/kernel/debug/usb/usbmon/2u > /tmp/robo_reggea.mon.out
other session: 2$ > aplay "/usr/share/hydrogen/data/drumkits/TD-7kit/S-177
Reggae 4.wav"
Playing WAVE '/usr/share/hydrogen/data/drumkits/TD-7kit/S-177 Reggae 4.wav' :
Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
sounds cracking ("robotic")
(cat) ^c
trace: /tmp/robo_reggea.mon.out (attached)
if you prefer another soundfile or player just name them. (For another day,
though :-).
Again: thanks a lot!
** Attachment added: "usbmon trace robotic UX2"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1103018/+attachment/3746939/+files/robo_reggea.mon.out
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https://bugs.launchpad.net/bugs/1103018
Title:
line6usb - POD Studio UX2 Playback problem. Very robotic and slightly
slower than usual
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https://bugs.launchpad.net/linux/+bug/1103018/+subscriptions
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