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| The Following User Says Thank You to Flos For This Useful Post: | ||
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2017-03-05
, 16:39
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Posts: 194 |
Thanked: 1,167 times |
Joined on May 2016
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#122
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Originally Posted by Flos
No easy way, since it's a known issue due to V5 having different sound codec. I didn't see those errors before though. Could you please provide full dmesg log after boot (upload as file or to pastebin) and DSDT tables dump:
Ahh.. yes, you're right, it shuld be a V5. The full string is:
P820DBFBV5A01619
So, any chance I can bring the sound back? Thanks!
Code:
cat /sys/firmware/acpi/tables/DSDT > dsdt.dat
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2017-03-14
, 15:33
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Posts: 194 |
Thanked: 1,167 times |
Joined on May 2016
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#124
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Originally Posted by Flos
Thanks for the logs. I did some investigation in spare time. DSDT is almost the same with V3. I downloaded Android firmwares for both revisions and compared their kernels with BinDiff to see if there are changes in sound codec or SST drivers. Surprisingly, there are no obvious differences in code, which means it might be data that's different.
Hi TheKit, please kindly find the file in the attachment. Thanks!
I compared rt5640_init_reg array in kernel binaries and found exactly one change:
Code:
{RT5640_HPO_MIXER, 0xc000}, /*HPVOL -> HPOLMIX */
/*{RT5640_HPO_MIXER, 0xa000},//DAC1 -> HPOLMIX*/
I presume this won't be the only change, but I want V5 owners to test this kernel and post dmesg before I go further.
Code:
devel-su mkdir /boot/esp mount /dev/mmcblk0p1 /boot/esp mv /boot/esp/bzImage /boot/esp/bzImage-old cp bzImage /boot/esp/bzImage reboot
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2017-03-14
, 17:35
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Posts: 172 |
Thanked: 353 times |
Joined on Nov 2014
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#125
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Originally Posted by TheKit
Here's pastebin from mine.
I want V5 owners to test this kernel and post dmesg before I go further.
I just want to say, I really appreciate what you're doing here!
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2017-03-14
, 17:55
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Posts: 194 |
Thanked: 1,167 times |
Joined on May 2016
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#126
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Originally Posted by tmi
Thank you! Now that's different from other devices, rt5642 codec isn't detected on I2C. Could you please also upload your DSDT?
Here's pastebin from mine.
I just want to say, I really appreciate what you're doing here!
Code:
cat /sys/firmware/acpi/tables/DSDT > dsdt.dat
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2017-03-16
, 14:24
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Posts: 194 |
Thanked: 1,167 times |
Joined on May 2016
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#129
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@tmi, @tmichel your device has rt5651 codec, as opposed to rt5642 on V3 (and some other V5?). Newer kernel has driver for rt5651 codec, but likely it won't be easy to backport to 3.10. Wish there was a way to get actual kernel source used for the tablet.
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2017-03-16
, 16:01
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Posts: 169 |
Thanked: 194 times |
Joined on Apr 2012
@ Austria
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#130
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here's mine, as usual i just added the extension because of the filesize edit: experimental kernel with audio
Last edited by smatkovi; 2017-03-17 at 11:03.
Last edited by smatkovi; 2017-03-17 at 11:03.
P820DBFBV5A01619
So, any chance I can bring the sound back? Thanks!
Last edited by Flos; 2017-03-05 at 14:54.