Do as Greg says [1]:
> All users of the 4.9 kernel series must upgrade.
Changes for Linux 4.9.2 [2][3]:
> The Linux kernel is seeing a lot of improvements lately, yes again, and
> the newest stable Linux 4.9 series has already received its second point
> release, two days after Greg Kroah-Hartman's announcement for Linux
> kernel 4.9.1.
>
> With the availability of Linux kernel 4.9.1, users are now finally able
> to migrate from other kernel series to Linux 4.9, which is the most
> advanced version available on the market. But do not bother to attempt a
> compilation of Linux kernel 4.9.1 because Linux kernel 4.9.2 is already
> here, bringing lots of improvements.
>
> From the appended shortlog, we can't help but notice that there's now
> better support for AMD Radeon HD 8000 series of graphics cards, and it
> just happens that we have a laptop with hybrid AMD/Intel GPUs running an
> AMD Radeon HD 8750 discrete card. So, like many of you out there, this
> comes as good news to us.
>
> There are a total of 141 files changed in the Linux 4.9.2 kernel, with
> 1031 insertions and 438 deletions, so you can imagine that there are
> quite a few improvements, in particular to the AMDGPU, Nouveau, Intel
> i915, InfiniBand, DVB, MMC, wireless (many Atheros and Realtek fixes),
> SCSI (s390 too), thermal, staging, and TTY drivers.
>
> "I'm announcing the release of the 4.9.2 kernel. All users of the 4.9
> kernel series must upgrade. The updated 4.9.y git tree can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> linux-4.9.y and can be browsed at the normal kernel.org git web browser:
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary,"
> said Greg Kroah-Hartman.
>
> ### It's already in Arch Linux Testing, and it's coming soon to other rolling distros ###
>
> Some ACPI improvements are there as well in Linux kernel 4.9.2, bringing
> better support for the Dell XPS 17 L702X and HP Pavilion dv6 notebooks,
> and there's also improved support for the NFS file system, and the ARC,
> ARM64/AArch64, PowerPC (PPC), s390, and x86 hardware architectures.
>
> Other than that, it looks like the networking stack was updated with
> small mac80211, Ceph, SunRPC, vmw_vsock, and wireless enhancements.
> Linux kernel 4.9.2 is available for download right now, either via our
> web portal or directly from kernel.org, if you fancy compiling your own
> kernel from sources.
>
> If not, it should soon be available in the stable repositories of
> various rolling distributions, including Arch Linux (now in testing) and
> Solus (also in testing). And considering the fact that the Linux 4.8
> series reached end of life, we recommend switching to Linux 4.9 as soon
> as possible.
[1] https://lwn.net/Articles/711063/
[2] http://news.softpedia.com/news/linux-kernel-4-9-2-improves-support-for-amd-radeon-hd-8000-series-dell-xps-17-511715.shtml
[3] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.2