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i915: Fix opregion notifications

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opregion-based platforms will send ACPI video event 0x80 for a range of
notification types for legacy compatibility. This is interpreted as a
display switch event, which may not be appropriate in the circumstances.
When we receive such an event we should make sure that the platform is
genuinely requesting a display switch before passing that event through
to userspace.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Tested-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Matthew Garrett
2011-07-12 18:30:52 -04:00
committed by Keith Packard
parent 2bf71160f9
commit f5a3d0c408
3 changed files with 17 additions and 7 deletions
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drivers/gpu/drm/i915/intel_opregion.c
+11 -4
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@@ -297,19 +297,26 @@ static int intel_opregion_video_event(struct notifier_block *nb,
/* The only video events relevant to opregion are 0x80. These indicate
either a docking event, lid switch or display switch request. In
Linux, these are handled by the dock, button and video drivers.
We might want to fix the video driver to be opregion-aware in
future, but right now we just indicate to the firmware that the
request has been handled */
*/
struct opregion_acpi *acpi;
struct acpi_bus_event *event = data;
int ret = NOTIFY_OK;
if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
return NOTIFY_DONE;
if (!system_opregion)
return NOTIFY_DONE;
acpi = system_opregion->acpi;
if (event->type == 0x80 && !(acpi->cevt & 0x1))
ret = NOTIFY_BAD;
acpi->csts = 0;
return NOTIFY_OK;
return ret;
}
static struct notifier_block intel_opregion_notifier = {