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3e331a6715Currently, many instability cases related to D3Cold -> D0 transition on BMG are under investigation. Among them some bad cases where the device is lost after 1 to 3 transitions from D3Cold to D0 on the runtime pm, with pcieport upstream bridge port link retrain failure. In other cases, it works fine, but with some sudden random memory corruptions after D3cold, that could be 0xffff missed ack on GT forcewake or GuC reload related failures. In some other cases though, D3Cold -> D0 works pretty reliably. It looks like it is a combination of GPU cards and Host boards at this point. So, there is no possible/available quirk at this time. This patch disables the D3Cold by default on BMG by reducing the vram_d3cold_threshold to 0. Users and developers who wants to enable it are still able to via $ echo 300 > /sys/bus/pci/devices/<addr>/vram_d3cold_threshold Fixes: |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.