4.14.10-gentoo-r1 breaks Heimdall + cups functionality

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Hi

Abstract: Heimdall does not work with 4.14.10-gentoo-r1.
Heimdall is an open source SAMSUNG odin protocol software to write custom software to SAMSUNG ANDROID Tablets over USB.

Going back to kernel 4.9.73-gentoo seems to have fixed it. A very small chance that the --no-reboot option of heimdall did the trick. that is up to discussion. Fact is an older kernel works on my side with cups and heimdall on the first try. 


I'll quote you the text which I have written in https://bugzilla.kernel.org/show_bug.cgi?id=198329

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I will not make another bug report. Similar issue also related to USB but not CUPS related
Same box. Reverted to newest stable kernel.org gentoo based kernel.
roman@ASUS-G75VW ~ $ uname -a
Linux ASUS-G75VW 4.9.73-gentoo-03-01-2018 #3 SMP Tue Jan 2 16:36:33 CET 2018 x86_64 Intel(R) Core(TM) i7-3610QM CPU @ 2.30GHz GenuineIntel GNU/Linux
forum: https://forum.xda-developers.com/galaxy-tab-a/help/heimdall-t3701920/page2
My user name there: __roman__
Please pay attention to post #12
I was unable to flash TWRP recovery to my SAMSUNG Tablet with heimdall.
I'm kinda certain as cups was misbehaving and also heimdall it is a kernel issue.
Heimdall is the open source software to use the SAMSUNG odin protocol to write custom software like recovery to SAMSUNG TABLETS.
Only thing I changed regarding heimdall was the Kernel.
Only changes I did because I want to enforce fixed lowest cpu frequency was: CONFIG_X86_ACPI_CPUFREQ: M; X86_PCC_CPUFREQ [=m]; X86_INTEL_PSTATE [=n] (disable that as it is broken, i want 3 hours of battery life out of my notebook when i am on the road!)
There is small chance that --no-reboot option of heimdall may be the root cause but I highly doubt it. AS heimdall and cups were "broken" in my point of view as a user. And a long term gentoo user ~12-13 years. I used linux on other distros before also like SUSE 6.2. slackware 96 and such.
I tried several times to write custom recovery with heimdall.
i used several hours to get the printer working with kernel 4.14.x
I tested all different use-flags for cups and other packages. 
new cups config folder and such.
using an older kernel + grabing /cups folder from a backup (maybe 2 weeks old backup i suppose) fixed it
gentoo does not touch config files in /etc
I did that to rule out a mistake on my side, so i grabbed from a full backup the hole cups folder in etc.
For myself the issue is resolved. Broken kernel. I had different issues with other kernel branches also, which do not exists as of a few hours ago. 4.10 / 4.12 / 4.13
I will see in a few weeks if kernel branch 4.9.x is useable for myself.
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