Bug 1260292

Summary: Microcode SW error detected with Intel 6235 WiFi
Product: [Fedora] Fedora Reporter: Stan King <stanley.king>
Component: iwlwifi-firmwareAssignee: Orphan Owner <extras-orphan>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 22CC: extras-orphan, linville
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-07-19 17:47:16 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Attachments:
Description Flags
Excerpt of /var/log/messages showing error, hostname redacted.
none
dmesg command output covering the system start-up none

Description Stan King 2015-09-05 16:29:53 UTC 
Created attachment 1070511 [details]
Excerpt of /var/log/messages showing error, hostname redacted.

Description of problem:

Lately I've seen occasional "Microcode SW error" message issued by the iwlwifi interface.  It may be similar to bug 1062837, although in my case, the recovery is successful.  The first few lines of the error report are:

Sep  5 03:46:38 ... kernel: iwlwifi 0000:0b:00.0: Microcode SW error detected.  Restarting 0x82000000.
Sep  5 03:46:38 ... kernel: iwlwifi 0000:0b:00.0: CSR values:
Sep  5 03:46:38 ... kernel: iwlwifi 0000:0b:00.0: (2nd byte of CSR_INT_COALESCING is CSR_INT_PERIODIC_REG)
Sep  5 03:46:38 ... kernel: iwlwifi 0000:0b:00.0:        CSR_HW_IF_CONFIG_REG: 0X00484b00
Sep  5 03:46:38 ... kernel: iwlwifi 0000:0b:00.0:          CSR_INT_COALESCING: 0X0000ff40

I'll attempt to attach the detailed messages, and the dmesg output from the system startup.

Version-Release number of selected component (if applicable):

Firmware version 18.168.6.1 for Intel 6235 wireless.

How reproducible:

Error occurs sporadically, every one or two days, usually when the system is not is use.  It appears most frequently when connected to a 2.4 GHz access point.  The 2.4 GHz wireless environment here is relatively crowded.

Steps to Reproduce:
1. Boot system, connect to 2.4 GHz access point.
2. Wait.
3.

Actual results:

Errors, as described above.

Expected results:

No errors.

Additional info:
Comment 1 Stan King 2015-09-05 16:31:01 UTC 
Created attachment 1070512 [details]
dmesg command output covering the system start-up
Comment 2 Fedora End Of Life 2016-07-19 17:47:16 UTC 
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
bug.

Thank you for reporting this bug and we are sorry it could not be fixed.
Comment 3 Stan King 2016-07-24 18:11:33 UTC 
As a note to anyone who might re-open this, I no longer have this hardware, so I would not be able to verify a fix.