sensor-hub: Move the memset to sensor_hub_get_feature()

Ritesh Raj Sarraf

author

2016-12-28 11:38 UTC #0 lore raw

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Hash: SHA512

Hello Srini,

Regarding: https://www.spinics.net/lists/linux-input/msg48540.html

This patch does not seem to fix the issue entirely. On my machine, where on previous kernels from 4.7 and 4.8 worked fine, this patch hasn't made much difference on 4.9.

rrs@learner:~$ lspci
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI
mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe
Wireless Network Adapter
2016-12-28 / 17:07:16 ♒♒♒  ☺  
rrs@learner:~$ uname -a
Linux learner 4.9.0+ #1 SMP Mon Dec 26 14:20:36 IST 2016 x86_64 GNU/Linux
2016-12-28 / 17:07:24 ♒♒♒  ☺

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Ritesh Raj Sarraf

author

2016-12-28 13:23 UTC #1 lore raw

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Oh! That did not include my usb listing. Please find it below. If you need more information, please tell me.

rrs@learner:~$ lsusb 
Bus 003 Device 002: ID 8087:8000 Intel Corp. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 048d:8350 Integrated Technology Express, Inc. 
Bus 001 Device 005: ID 0bda:b728 Realtek Semiconductor Corp. 
Bus 001 Device 004: ID 04f2:b40f Chicony Electronics Co., Ltd 
Bus 001 Device 003: ID 04f3:0303 Elan Microelectronics Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
2016-12-28 / 18:51:08 ♒♒♒  ☺

and

rrs@learner:~$ sudo lsusb  -v -d 048d:8350

Bus 001 Device 006: ID 048d:8350 Integrated Technology Express, Inc. Device Descriptor:
bLength                18
bDescriptorType         1
bcdUSB               2.00
bDeviceClass            0 (Defined at Interface level) bDeviceSubClass         0
bDeviceProtocol         0
bMaxPacketSize0        64
idVendor           0x048d Integrated Technology Express, Inc. idProduct          0x8350
bcdDevice           10.10
iManufacturer           1 ITE Tech. Inc.
iProduct                2 ITE Device(8350)
iSerial                 0
bNumConfigurations      1
Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device bInterfaceSubClass      0 No Subclass bInterfaceProtocol      0 None
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported bNumDescriptors         1
          bDescriptorType        34 Report wDescriptorLength    2913
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
Device Status:     0x0000
(Bus Powered)
2016-12-28 / 18:52:05 ♒♒♒  ☺

Quoted 21 lines · Ritesh Raj Sarraf

Hello Srini,

Regarding: https://www.spinics.net/lists/linux-input/msg48540.html

This patch does not seem to fix the issue entirely. On my machine, where on previous kernels from 4.7 and 4.8 worked fine, this patch hasn't made much difference on 4.9.

rrs@learner:~$ lspci
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev
0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev
e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI

Quoted 11 lines

mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe
Wireless Network Adapter
2016-12-28 / 17:07:16 ♒♒♒  ☺  
rrs@learner:~$ uname -a
Linux learner 4.9.0+ #1 SMP Mon Dec 26 14:20:36 IST 2016 x86_64 GNU/Linux
2016-12-28 / 17:07:24 ♒♒♒  ☺

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Srinivas Pandruvada

2016-12-28 16:48 UTC #2 lore raw

Hi Ritesh,

Quoted 4 lines · Ritesh Raj Sarraf

Oh! That did not include my usb listing. Please find it below. If you need more
information, please tell me.

Did you pick up the latest iio-sensor-proxy? There was some changes required in that.

Also check under /sys/bus/iio/devices/iio:device* cat the raw x, y z for accelerometer and check if they change.

Thanks,
Srinivas

Quoted 124 lines

rrs@learner:~$ lsusb 
Bus 003 Device 002: ID 8087:8000 Intel Corp. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 048d:8350 Integrated Technology Express, Inc. 
Bus 001 Device 005: ID 0bda:b728 Realtek Semiconductor Corp. 
Bus 001 Device 004: ID 04f2:b40f Chicony Electronics Co., Ltd 
Bus 001 Device 003: ID 04f3:0303 Elan Microelectronics Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
2016-12-28 / 18:51:08 ♒♒♒  ☺  
and
rrs@learner:~$ sudo lsusb  -v -d 048d:8350
Bus 001 Device 006: ID 048d:8350 Integrated Technology Express, Inc. Device Descriptor:
bLength                18
bDescriptorType         1
bcdUSB               2.00
bDeviceClass            0 (Defined at Interface level) bDeviceSubClass         0
bDeviceProtocol         0
bMaxPacketSize0        64
idVendor           0x048d Integrated Technology Express, Inc. idProduct          0x8350
bcdDevice           10.10
iManufacturer           1 ITE Tech. Inc.
iProduct                2 ITE Device(8350)
iSerial                 0
bNumConfigurations      1
Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device bInterfaceSubClass      0 No Subclass bInterfaceProtocol      0 None
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported bNumDescriptors         1
          bDescriptorType        34 Report wDescriptorLength    2913
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
Device Status:     0x0000
(Bus Powered)
2016-12-28 / 18:52:05 ♒♒♒  ☺
Quoted 46 lines · Ritesh Raj Sarraf
Hello Srini,
Regarding: https://www.spinics.net/lists/linux-input/msg48540.html
This patch does not seem to fix the issue entirely. On my machine, where on
previous kernels from 4.7 and 4.8 worked fine, this patch hasn't made much
difference on 4.9.
rrs@learner:~$ lspci
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
Integrated
Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio
Controller (rev
0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev
04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI
#0 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio
Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root
Port 4 (rev
e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev
04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev
04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller
1 [AHCI
mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
01:00.0 Network controller: Realtek Semiconductor Co., Ltd.
RTL8723BE PCIe
Wireless Network Adapter
2016-12-28 / 17:07:16 ♒♒♒  ☺  
rrs@learner:~$ uname -a
Linux learner 4.9.0+ #1 SMP Mon Dec 26 14:20:36 IST 2016 x86_64
GNU/Linux
2016-12-28 / 17:07:24 ♒♒♒  ☺  

Ritesh Raj Sarraf

author

2016-12-28 17:24 UTC #3 lore raw

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Hash: SHA512

Hi Srinivas,

Thank you very much for the quick reply.

Quoted 10 lines · Srinivas Pandruvada

Hi Ritesh,
Quoted 4 lines · Ritesh Raj Sarraf
Oh! That did not include my usb listing. Please find it below. If you need more
information, please tell me.
Did you pick up the latest iio-sensor-proxy? There was some changes required in that.

I tested it with 2.0, which was release around 3 weeks ago. Since then, there's been 1 single change from today. I've picked that up and am building it now. I'll share results with the newer proxy daemon soon.

Quoted 2 lines

Also check under /sys/bus/iio/devices/iio:device* cat the raw x, y z for accelerometer and check if they change.

Thanks for mentioning this. The output on my setup looks suspicious.

rrs@learner:/sys/bus/iio/devices$ while true; do for x in iio*; do echo -en "Device: $x\t `cat $x/*[x-z]_raw`\n"; done; echo -en "sleep 2 secs\n\n"; sleep 2;  done
Device: iio:device0	 553
6
3561
Device: iio:device1	 -1644531
441406
- -2484375
cat: 'iio:device2/*[x-z]_raw': No such file or directory
Device: iio:device2	 
Device: iio:device3	 22381
- -22381
0
cat: 'iio:device4/*[x-z]_raw': No such file or directory
Device: iio:device4	 
Device: iio:device5	 15
64615
65220
sleep 2 secs

Device: iio:device0 553
6
3561
Device: iio:device1 -1644531
441406
- -2484375
cat: 'iio:device2/*[x-z]_raw': No such file or directory
Device: iio:device2
Device: iio:device3 22381
- -22381
0
cat: 'iio:device4/*[x-z]_raw': No such file or directory
Device: iio:device4
Device: iio:device5 15
64615
65220
sleep 2 secs

^C
2016-12-28 / 22:46:54 ♒♒♒ ☹ => 130

rrs@learner:/sys/bus/iio/devices$ ls iio\:device2/
buffer/  in_intensity_both_raw    in_intensity_offset              in_intensity_scale  power/          subsystem@  uevent
dev      in_intensity_hysteresis  in_intensity_sampling_frequency  name                scan_elements/  trigger/
2016-12-28 / 22:47:08 ♒♒♒  ☺

rrs@learner:/sys/bus/iio/devices$ cat iio\:device*/name
incli_3d
magn_3d
als
gyro_3d
dev_rotation
accel_3d
2016-12-28 / 22:47:29 ♒♒♒  ☺

Device4, for which there are no x, y, z attributes, reports the name "dev_rotation". Even for the other devices, I see no change in the reported values.

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Ritesh Raj Sarraf

author

2016-12-28 17:37 UTC #4 lore raw

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Quoted 3 lines · Ritesh Raj Sarraf

Device4, for which there are no x, y, z attributes, reports the name "dev_rotation".
Even for the other devices, I see no change in the reported values.

On the 4.8 kernel, the values do change. The iio-sensor-proxy still does not do the rotation.

rrs@learner:/sys/bus/iio/devices$ while true; do for x in iio*; do echo -en
"Device: $x\t `cat $x/*[x-z]_raw`\n"; done; echo -en "sleep 2 secs\n\n"; sleep
2;  done
Device: iio:device0	 616
6
3570
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1	 
Device: iio:device2	 111905
- -44762
- -22381
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3	 
Device: iio:device4	 27
64861
65298
Device: iio:device5	 -1625000
402343
- -2531250
sleep 2 secs

Device: iio:device0 616
6
3570
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 22381
0
0
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1632812
402343
- -2531250
sleep 2 secs

Device: iio:device0 542
65503
3599
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 -111905
- -2887161
4274790
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1625000
429687
- -2511718
sleep 2 secs

Device: iio:device0 94
64699
425
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 693814
- -223811
1589058
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1539062
492187
- -2523437
sleep 2 secs

Device: iio:device0 145
893
2676
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 -738576
872862
- -6065278
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1503906
230468
- -2609375
sleep 2 secs

Device: iio:device0 488
808
2692
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 2551445
- -3536213
14592477
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1597656
222656
- -2621093
sleep 2 secs

Device: iio:device0 64240
750
2437
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 2663350
- -581908
3021448
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1488281
347656
- -2601562
sleep 2 secs

Device: iio:device0 63984
891
2470
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 -358097
402859
- -828100
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1468750
375000
- -2601562
sleep 2 secs

Device: iio:device0 1637
64842
524
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 11548647
2663350
- -16606776
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1441406
50781
- -2585937
sleep 2 secs

Device: iio:device0 649
642
2564
cat: 'iio:device1/*[x-z]_raw': No such file or directory
Device: iio:device1
Device: iio:device2 -5237177
- -2126204
19225364
cat: 'iio:device3/*[x-z]_raw': No such file or directory
Device: iio:device3
Device: iio:device4 27
64861
65298
Device: iio:device5 -1652343
210937
- -2570312
sleep 2 secs

^C
2016-12-28 / 23:01:36 ♒♒♒ ☹ => 130
(reverse-i-search)`name': quilt rename data-Fix-compass-property-^Cme.patch2016- 12-28 / 23:01:54 ♒♒♒ ☹ => 130

rrs@learner:/sys/bus/iio/devices$ cat iio\:device*/name
incli_3d
als
gyro_3d
dev_rotation
accel_3d
magn_3d
2016-12-28 / 23:02:35 ♒♒♒  ☺

rrs@learner:/sys/bus/iio/devices$ uname -a
Linux learner 4.8.15+ #47 SMP Wed Dec 21 14:19:46 IST 2016 x86_64 GNU/Linux
2016-12-28 / 23:02:41 ♒♒♒  ☺

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Ritesh Raj Sarraf

author

2016-12-28 17:54 UTC #5 lore raw

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Quoted 8 lines · Ritesh Raj Sarraf

Quoted 3 lines · Ritesh Raj Sarraf
Device4, for which there are no x, y, z attributes, reports the name "dev_rotation".
Even for the other devices, I see no change in the reported values.
On the 4.8 kernel, the values do change. The iio-sensor-proxy still does not do
the rotation.

For the sake of completeness, I booted up iio-sensor-proxy (with latest patch from today), on both 4.8 and 4.9.

With 4.8, I am reliably able to see screen rotation. And for the record, on 4.8, the memset change is the old one.

With 4.9, nothing. Which may be expected given there were no data seen with those device attributes (when using cat).

If you need more information, please tell me.

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Srinivas Pandruvada

2016-12-29 17:25 UTC #6 lore raw

Quoted 21 lines · Ritesh Raj Sarraf

Quoted 8 lines · Ritesh Raj Sarraf
Quoted 6 lines · Ritesh Raj Sarraf
Device4, for which there are no x, y, z attributes, reports the name
"dev_rotation".
Even for the other devices, I see no change in the reported values.
Quoted 4 lines
On the 4.8 kernel, the values do change. The iio-sensor-proxy still does not
do
the rotation.
For the sake of completeness, I booted up iio-sensor-proxy (with latest patch
from today), on both 4.8 and 4.9.
With 4.8, I am reliably able to see screen rotation. And for the record, on 4.8,
the memset change is the old one.

Quoted 6 lines

With 4.9, nothing. Which may be expected given there were no data seen with
those device attributes (when using cat).
If you need more information, please tell me.

I tried on couple of systems with the patch. It seems to fix the issue. It is possible some low level power related changes have impacted this. Can you do bisect? I suggest just try 4.9-rc1. I think it will not work there probably.

Thanks,
Srinivas

Quoted 2 lines

Ritesh Raj Sarraf

author

2016-12-29 17:31 UTC #7 lore raw

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Quoted 6 lines · Srinivas Pandruvada

Quoted 1 line
If you need more information, please tell me.
I tried on couple of systems with the patch. It seems to fix the issue. It is possible some low level power related changes have impacted this. Can you do bisect? I suggest just try 4.9-rc1. I think it will not work there probably.

Okay. Let me do a bisect on it. I'll ping back on this thread soon.

Thanks.

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Ritesh Raj Sarraf

author

2016-12-30 10:47 UTC #8 lore raw

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Hello Srini,

Quoted 9 lines · Ritesh Raj Sarraf

Quoted 6 lines · Srinivas Pandruvada
Quoted 1 line
If you need more information, please tell me.
I tried on couple of systems with the patch. It seems to fix the issue. It is possible some low level power related changes have impacted this. Can you do bisect? I suggest just try 4.9-rc1. I think it will not work there probably.
Okay. Let me do a bisect on it. I'll ping back on this thread soon.

Since yesterday's attempts, I haven't been able to reproduce the bug again, so far. Apart from re-building the kernel, I have also blacklisted the particular USB device from power savings (based on your hint). I don't know if disabling the power savings for that USB device is the cause for not seeing the issue, but so far, the device seems to report data.

Do you think power savings mode can impact these devices ? I know of USB plugged keyboard/mice to generally break, when enabling power savings mode. But I had hoped that in-built USB devices were immune to it.

Thanks,
Ritesh

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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Srinivas Pandruvada

2016-12-30 16:53 UTC #9 lore raw

Quoted 26 lines · Ritesh Raj Sarraf

Hello Srini,
Quoted 5 lines · Ritesh Raj Sarraf
Quoted 3 lines · Srinivas Pandruvada
Quoted 3 lines
If you need more information, please tell me.
Quoted 8 lines
Quoted 7 lines
I tried on couple of systems with the patch. It seems to fix the issue.
It is possible some low level power related changes have impacted this.
Can you do bisect? I suggest just try 4.9-rc1. I think it will not work
there probably.
Okay. Let me do a bisect on it. I'll ping back on this thread soon.
Since yesterday's attempts, I haven't been able to reproduce the bug again, so
far. Apart from re-building the kernel, I have also blacklisted the particular
USB device from power savings (based on your hint). I don't know if disabling
the power savings for that USB device is the cause for not seeing the issue, but
so far, the device seems to report data.

Quoted 6 lines

Do you think power savings mode can impact these devices ? I know of USB plugged
keyboard/mice to generally break, when enabling power savings mode. But I had
hoped that in-built USB devices were immune to it.

This is possible. If your remove from blacklist does it still work? May be rebuild of kernel fixed this:-)

Thanks,
Srinivas

Quoted 3 lines

Thanks,
Ritesh

Ritesh Raj Sarraf

author

2016-12-31 12:55 UTC #10 lore raw

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Quoted 9 lines · Srinivas Pandruvada

Quoted 6 lines
Do you think power savings mode can impact these devices ? I know of USB plugged
keyboard/mice to generally break, when enabling power savings mode. But I had
hoped that in-built USB devices were immune to it.
This is possible. If your remove from blacklist does it still work? May be rebuild of kernel fixed this:-)

As much as I want to blame it on power savings, that is not the case. Even with power savings enabled, it is all working fine now.

Which means the new kernel build fixed things. Which made me wonder what the difference could be, because I built this new kernel on the same Debian machine, with the same toolchain. And not only did it fix this issue, it has fixed an old annoying USB issue [1] and also many other glitches [2].

While it is nice, if I wanted to pin point any difference, all that I could see is the tool used to build the kernel packages. Earlier, it was through make-kpkg whereas now I am building it with the stock binpkg-deb target.

Other than that, I am out of ideas on why things have improved. Whatever be the case, I'm glad that I don't see those annoying issues anymore. What a way to end the year. Happy New Year, 2017 to all of you.

[1] https://www.spinics.net/lists/linux-usb/msg144634.html
[2] https://www.researchut.com/blog/lenovo-yoga-2-13-debian

- --
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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