** Changed in: linux-firmware (Ubuntu Zesty)
Status: Fix Released => Confirmed
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https://bugs.launchpad.net/bugs/1647826
Title:
intel 8260 doesn't work with linux kernel 4.8 when using ucode version
22
Status in linux-firmware package in Ubuntu:
Confirmed
Status in linux-firmware source package in Xenial:
Fix Released
Status in linux-firmware source package in Yakkety:
Fix Released
Status in linux-firmware source package in Zesty:
Confirmed
Bug description:
SRU Justification
Impact: The -22 firmware for iwlwifi introduces regressions with some
hardware versus earlier firmware versions. As no newer firmware is
available, the only fix is to revert back to the older firmware which
does work.
Test Case: Using the -22 firmware with affected hardware produces the
behavior described below. The -21 firmware does not.
Regression Potential: Switching back to -21 could cause some
regressions with other hardware supported by this firmware. However as
-22 causes some hardware to completely fail to work any regressions
are almost certain to be less severe than the current problems.
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The -22 microcode for the intel 8260 wifi adapter has compatibility
issues with Linux Kernel 4.8 under certain hardware configurations.
The iwlwifi module crashes resulting in wifi failing with "device not
ready" and kernel errors reported in dmesg.
[ 10.691115] iwlwifi 0000:6e:00.0: Microcode SW error detected.
Restarting 0x2000000.
Renaming the ucode file at /lib/firmware/iwlwifi-8000C-22.ucode to
fallback to the -21 ucode resolves the issue and wifi begins working
normally again.
This is an issue with Linux kernel 4.8 on both yakkety and xenial, so
the bug doesn't currently affect users on xenial, but will begin to
after the 16.04.2 HWE release. Kernel 4.4 is unaffected because it
doesn't attempt to use the -22 ucode
The failure doesn't necessarily affect all machines of a given model
with the 8260, but I can reproduce it on multiple laptops when 64GB of
RAM are installed (4x16GB). The RAM itself does not appear to be an
issue.
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