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During system resume the display power state verification will print the "power well x state mismatch (refcount 0/enabled 1)" error message from the early resume sequence for a power well left enabled by BIOS. This power well was probably left enabled by BIOS inadvertently, since BIOS versions on current platforms do not leave any display output enabled while resuming from an Sx power state, hence the enabled display power well is unused. In theory however it is possible that BIOS leaves a display output enabled, in that case the enabled power well shouldn't be reported as an error. According to the above, remove the display power state verification from the early resume phase to avoid incorrectly reporting an enabled power well without a power reference as an error. Note: The refcount for any enabled and used power well (i.e. used for an enabled display output) will be acquired following the early resume sequence, after the HW state for display outputs (encoder/crtc etc.) is read out. Any power well enabled but not used (hence not holding a reference) will be disabled after the HW state readout. The display power state will be verified afterwards in intel_power_domains_enable(). Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6012 Reviewed-by: Mika Kahola <mika.kahola@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://lore.kernel.org/r/20250903122152.2526050-1-imre.deak@intel.com |
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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.