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Atm, during system resume, the driver updates the display connector information required by the opregion video extensions during system resume, on platforms both with and without display being present. On !HAS_DISPLAY platforms this will result in the crash with the stack trace below, since the driver's connector state is not initialized on those. Bspec doesn't specify when each of the opregion functionality is supported (depending on the presence of display), however we can presume that none of the video extensions, nor the ACPI _DSM functions are supported on !HAS_DISPLAY platforms; accordingly skip the corresponding opregion/ACPI setup on those (also matching the Windows driver in this). Keep sending the opregion notification about suspending/resuming the whole adapter (vs. the display only which is a separate power state notification) on all platforms, similarly to runtime suspend/resume. This fixes the following: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 1443 Comm: kworker/u40:55 Tainted: G U 6.2.0-rc8+ #58 Hardware name: LENOVO 82VB/LNVNB161216, BIOS KMCN09WW 04/26/2022 Workqueue: events_unbound async_run_entry_fn RIP: 0010:drm_connector_list_iter_next+0x4f/0xb0 Call Trace: <TASK> intel_acpi_device_id_update+0x80/0x160 [i915] intel_opregion_resume+0x2f/0x1e0 [i915] ? dg2_init_clock_gating+0x49/0xf0 [i915] i915_drm_resume+0x137/0x190 [i915] ? __pfx_pci_pm_resume+0x10/0x10 dpm_run_callback+0x47/0x150 Cc: iczero <iczero@hellomouse.net> Reported-and-tested-by: iczero <iczero@hellomouse.net> References: https://gitlab.freedesktop.org/drm/intel/-/issues/8015 Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230308162503.3219200-1-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 Restructured Text 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.