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Post subject: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 19.11.2015, 19:55



Joined: 2010-09-12
Posts: 51
Location: Belgium
Status: Offline
I'm experiencing boot problems with the last 2 kernels 4.3.0
The boot proces hangs on acer_wmi.
A hard reset is required.

The 4.2.0-5.slh.1-aptosid-amd64 kernel is still working.
      Code:

infobash -v3
Host/Kernel/OS  "siduxbox" running Linux 4.2.0-5.slh.1-aptosid-amd64 x86_64 [ sidux 2008-01 Νυξ - kde-full - (200804120109) ]
CPU Info        2x AMD Athlon 64 X2 Dual-Core TK-53 256 KB cache flags( sse3 ht nx lm svm ) clocked at [ 800.000 MHz ]
Videocard       NVIDIA C51 [GeForce Go 6100]  X.Org 1.17.3  [ 1440x900@59.90hz ]
Network cards   NVIDIA MCP51
                Broadcom BCM4311 802.11b/g WLAN
Processes 150 | Uptime 1:39 | Memory 836.0/1753.8MB | HDD ST9120822AS,MHW2080BH Size 200GB (68%used) | GLX Renderer Gallium 0.4 on llvmpipe (LLVM 3.7, 128 bits) | GLX Version Yes | Client Shell | Infobash v3.50

 
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slhOffline
Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 19.11.2015, 21:45



Joined: 2010-08-25
Posts: 949

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Please remove the "quiet" kernel parameter in grub2 (at runtime), perhaps you get some further debugging information.

You can also check if blacklisting acer_wmi (echo "blacklist acer-wmi" >/etc/modprobe.d/acer-wmi.conf) allows your system to boot (this will likely disable the special notebook hotkeys, including the wlan (rfkill) button, thereby eventually preventing your wlan card from powering up).
 
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slhOffline
Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 20.11.2015, 01:02



Joined: 2010-08-25
Posts: 949

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There have only been two changes to acer-wmi between kernel v4.2 and v4.3:
- acer-wmi: No rfkill on HP Omen 15 wifi
- acer-wmi: remove threeg and interface sysfs interfaces
The former looks rather innocent, except perhaps if you do own the exact notebook in question.
The later 'should' be fine, unless you have configured your userspace in a way to somehow wait/ block on those old sysfs interfaces; but if you do, you might remember.

Please also closely check your kernel v4.2 syslog (dmesg, journalctl) for "This threeg sysfs will be removed in 2014 - used by: xxx" (the xxx is the most interesting part).

If neither of these ring a bell, we can prepare a git bisection for those two patches to confirm the hunch, but perhaps one of the suggestions already lead somewhere.


Last edited by slh on 24.11.2015, 23:10; edited 1 time in total
 
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Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 20.11.2015, 20:33



Joined: 2010-09-12
Posts: 51
Location: Belgium
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Hello Stefan,

It's an old ACER Aspire 9300.
No traces of threeg

in the syslog of the 4.2 kernel i have the following :

      Code:

journalctl | grep acer_wmi
Nov 20 21:16:37 siduxbox kernel: acer_wmi: Acer Laptop ACPI-WMI Extras
Nov 20 21:16:37 siduxbox kernel: acer_wmi: Function bitmap for Communication Device: 0x23


The 4.3 kernel hangs after the first line

I'll try the blacklist.

Thanks for your help !
 
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Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 20.11.2015, 20:49



Joined: 2010-09-12
Posts: 51
Location: Belgium
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blacklisting acer-wmi is working.
Wlan is ok
acer hotkeys never worked very well, so no problem with that.

thanks
Bruno
 
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slhOffline
Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 21.11.2015, 01:59



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O.k., that looks like a workaround for now - although it still needs to be fixed properly.

I'll try to provide one or two test kernels for debugging over the weekend, I'm not exactly sure when I'll find time for this though.
 
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slhOffline
Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 25.11.2015, 01:34



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For some rather loose definition of "weekend", there are now http://aptosid.com/slh/acer-wmi/4.3-2~rfkill/ and http://aptosid.com/slh/acer-wmi/4.3-2~threeg/ up for testing. If neither of those fix the problem, the actual root cause is outside of the acer-wmi kernel modules (which would make it much harder (==having to bisect the whole kernel between v4.2 and v4.3) to debug).
 
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Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 26.11.2015, 06:01



Joined: 2010-09-12
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ok i'll test them this weekend
 
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Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 28.11.2015, 20:10



Joined: 2010-09-12
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Hello Stefan,
Both kernels are not working.They both hang at the same position as before.
Put the blacklist back in place.
Bruno
 
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slhOffline
Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 28.11.2015, 20:31



Joined: 2010-08-25
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Thanks for confirming that, as both patches looked innocent enough...

The problem now is that those two patches are the only changes made to the acer_wmi module between v4.2 and v4.3, which means some unrelated changes triggered your boot failures. Those can be debugged, but doing so implies a full git bisection[1] between v4.2..v4.3 and testing roundabout 15 different kernel versions inbetween, to find the faulty commit. Given that except for the very first bisection step, I can't really help you with that, as all subsequent steps depend on which of the resulting test kernels are working or have failed.

[1] https://www.kernel.org/pub/software/scm/git/docs/git-bisect-lk2009.html, replace the plain make with "make deb-pkg".
 
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Post subject: RE: Boot proces stops on acer_wmi with kernels 4.3.0  PostPosted: 30.11.2015, 20:31



Joined: 2010-09-12
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Location: Belgium
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Hello Stefan,

This git bisection seems out of my league ...

I'll continue with the blacklist for the moment.

Thanks for your help.

Bruno
 
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