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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2015-03-01 10:41:37 +0000 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-03-04 15:10:36 +0100 |
| commit | 6e17cb12881ba8d5e456b89f072dc6b70048af36 (patch) | |
| tree | 15d74ea4f4ff7da5541a97b7ca300d0e7b7dfba7 /drivers | |
| parent | Linux 4.0-rc2 (diff) | |
| download | linux-dev-6e17cb12881ba8d5e456b89f072dc6b70048af36.tar.xz linux-dev-6e17cb12881ba8d5e456b89f072dc6b70048af36.zip | |
ACPI / video: Load the module even if ACPI is disabled
i915.ko depends upon the acpi/video.ko module and so refuses to load if
ACPI is disabled at runtime if for example the BIOS is broken beyond
repair. acpi/video provides an optional service for i915.ko and so we
should just allow the modules to load, but do no nothing in order to let
the machines boot correctly.
Reported-by: Bill Augur <bill-auger@programmer.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: All applicable <stable@vger.kernel.org>
Acked-by: Aaron Lu <aaron.lu@intel.com>
[ rjw: Fixed up the new comment in acpi_video_init() ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/video.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index debd30917010..5f98ac69729a 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -2176,6 +2176,17 @@ EXPORT_SYMBOL(acpi_video_unregister_backlight); static int __init acpi_video_init(void) { + /* + * Let the module load even if ACPI is disabled (e.g. due to + * a broken BIOS) so that i915.ko can still be loaded on such + * old systems without an AcpiOpRegion. + * + * acpi_video_register() will report -ENODEV later as well due + * to acpi_disabled when i915.ko tries to register itself afterwards. + */ + if (acpi_disabled) + return 0; + dmi_check_system(video_dmi_table); if (intel_opregion_present()) |