Re: Diagnosing ACPI trouble related to pinctr_cherryview on 4.4.x

[Martin Langhoff <martin.langhoff@xxxxxxxxx>]

This is a cheap consumer laptop I thought I'd get Fedora on in half an
hour -- grand plans ;-) -- I don't have it rigged to capture dmsg of
the crash, no serial adapter with me.

On the kernel command line... lvm, root settings 'single`.

This is an Acer Aspire One 11 Cloudbook Series AO1-131-C1G9 Model N15V1 .



m

On Tue, Mar 22, 2016 at 11:49 AM, Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> On Tue, Mar 22, 2016 at 11:41:38AM -0400, Martin Langhoff wrote:
>> On Tue, Mar 22, 2016 at 11:22 AM, Mika Westerberg
>> <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>> > I think this is a known issue.
>> >
>> > Please disable dw_dmac from your .config (or blacklist the module):
>> >
>> >   CONFIG_DW_DMAC_CORE=n
>> >   CONFIG_DW_DMAC=n
>> >
>> > You can also enable pinctrl-cherryview.c.
>>
>> Thanks for the suggestion. Did not complete boot however, got a
>> slightly different call trace, but still no go. As that trace crossed
>> _prepare_cpus I tried adding nosmp, but we still crash in
>> acpi_init->acpi_scan_init->acpi_bus_scan->acpi_bus_attach
>>
>> Any other suggestion? lspci normal and verbose follow...
>
> Do you have anything special on the kernel command line? You should not
> do anything else than disable DW_DMAC. That is enough to prevent the
> DMA hang if that's the issue.
>
> Are you able to get dmesg of the crash?



-- 
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