Bug#817016: linux-image-4.3.0-1-amd64: ThinkPad X1 Carbon: Boot stalls at "intel_pstate: HWP enabled"
Control: forwarded -1 https://bugzilla.kernel.org/show_bug.cgi?id=110941
On Mon, 2016-03-07 at 07:46 +0000, Andy Smith wrote:
> Package: src:linux
> Version: 4.3.5-1
> Severity: normal
>
> Dear Maintainer,
>
> Booting this kernel (or the debian-installer latest daily) results in a blank
> screen. When removing the quiet option the boot is seen to stall after printing
> "intel_pstate: HWP enabled".
>
> Here's a screenshot: http://i.imgur.com/cr5i72L.png
>
> Searching around found me another report from a Yoga 260 owner with the same
> issue. They've got a Skylake i5 whereas I've got a Skylake i7. A suggested
> workaround was to use kernel parameter:
>
> intel_pstate=no_hwp
>
> This allowed boot of the debian-installer and this installed kernel but I
> understand it disables many desirable power efficiency features.
FWIW I also tipped over this on an X1 carbon.
Looks like it is being investigated at https://bugzilla.kernel.org/show
_bug.cgi?id=110941
Ian.
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