Yes Christopher,
I verify that I personally tested the WORKAROUND. I'm the Alex Ballas
who raised the bug report in the first place.
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This is still an issue under 16.04
Workaround provided under https://bugzilla.kernel.org/show_bug.cgi?id=109231#c3
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Title:
1217:8520
I also find little point on doing that since both devices use the same Card
Reader.
Also tried the workaround but the performance hit was too big for me.
What's the average read/write speeds you get with the workaround
compared to the old kernels that are not affected by this bug?
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Hello Dexter1,
To my eyes this is the same issue as the one I reported under
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1523178
Feel free to check the details there (and especially the last comment)
Kind Regards,
Alex
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Further feedback from upstream.
http://comments.gmane.org/gmane.linux.kernel.mmc/34979
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Title:
1217:8520 [Dell Latitude E7450] O2 M
Hello Christopher,
Raised https://bugzilla.kernel.org/show_bug.cgi?id=109231
Could not include the people you mentioned though.
Please let me know if anything is missing.
Thanks
** Bug watch added: Linux Kernel Bug Tracker #109231
http://bugzilla.kernel.org/show_bug.cgi?id=109231
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** Tags removed: kernel-bug-exists-upstream-4.4-rc3
** Tags added: kernel-bug-exists-upstream-4.4-rc4
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Title:
1217:8520 [Dell Latitu
Hello Christopher,
This is still an issue with the latest mainline kernel (4.4-rc4)
$ uname -a
Linux cosmo 4.4.0-040400rc4-generic #201512061930 SMP Mon Dec 7 00:32:31 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
[1.248191] mmc0: tuning execution failed
[1.248195] mmc0: error -5 whilst initia
Can verify that after removing the following bit and recompiled the
kernel, the SD card reader played fine.
diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index b3b0a3e..27b0e11 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -618,7 +618,7
** Summary changed:
- SD card reader on Dell E7450 doesn't work in Ubuntu 15.10
+ SD card reader on Dell E7450 doesn't work in Ubuntu 15.10 - O2 Micro, Inc.
SD/MMC Card Reader Controller [1217:8520]
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Hello Christopher,
Thanks for the tips. Please refer to the bisect log
git bisect start 'Ubuntu-4.2.0-19.23' 'Ubuntu-4.1.0-3.3'
# good: [b953c0d234bc72e8489d3bf51a276c5c4ec85345] Linux 4.1
git bisect good b953c0d234bc72e8489d3bf51a276c5c4ec85345
# good: [3d9f96d850e4bbfae24dc9aee03033dd77c81596]
** Attachment added: "bisect_Ubuntu-4.2.0-19.23_Ubuntu-4.1.0-3.3.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1523178/+attachment/4532175/+files/bisect_Ubuntu-4.2.0-19.23_Ubuntu-4.1.0-3.3.log
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Thank you Christopher for the feedback,
I just tested the latest upstream kernel ap per your instructions and I still
get the same errors.
$ uname -a
Linux cosmo 4.4.0-040400rc3-generic #201511300321 SMP Mon Nov 30 03:23:36 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
** Tags added: kernel-bug-exist
Public bug reported:
Under ubuntu 15.10 I can't use my Sandisk ultra 64GB microSD (with a SD
card adapter) with the built in SD card reader. I seem to be getting the
following errors.
[ 1268.126602] sdhci: Timeout waiting for Buffer Read Ready interrupt during
tuning procedure, falling back to f
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
SD card reader on Dell E7250 doesn't work in Ubuntu 15.
I experienced exactly the same errors with a Dell E7450 which is practically
the same one as the Dell E7250.
I'm on Ubuntu 15.10
Went through all the kernels from 3.19 to 4.2 (http://kernel.ubuntu.com
/~kernel-ppa/) and found out that until 4.1.8-040108-generic the SD card
readers played fine an
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