Added support in 99video to check for a "smart enough" kernel video driver

One that is "smart enough" knows how to handle video card reinitialization
without needing any of the usual quirks.  Right now that list includes:
* nVidia binary driver.
* fglrx ATI binary driver.
* Intel i915 DRM driver on kernels at or after 2.6.26

1 files changed, 17 insertions, 0 deletions

diff --git a/pm/sleep.d/99video b/pm/sleep.d/99video
index c8efd12..27c08d0 100755
--- a/pm/sleep.d/99video
+++ b/pm/sleep.d/99video
@@ -99,6 +99,21 @@ vbe_post() { vbe post; sleep 0.1; }
 radeon_off() { radeon dac off; radeon light off; }
 radeon_on() { radeon dac on; radeon light on; }
 
+# Test to see if the kernel has a video driver that is smart enough
+# to handle quirks without external assistance.
+smart_kernel_video() 
+{
+        # If we are using an ATI or nVidia binary driver, do nothing.
+	[ -d /sys/module/nvidia -o -d /sys/module/fglrx ] && return 0;
+
+	local kernel_rev="$(uname -r |awk -F '[_-]' '{print $1}')"
+        # Intel can to the same thing, but only at or after kernel 2.6.26.
+	# FIXME: a more accurate way of testing this?
+	[ -d /sys/module/i915 ] && \
+	    [ "$kernel_rev" >= "2.6.26" ] && return 0;
+	return 1
+}
+
 suspend_video()
 {
 	# 0=nothing, 1=s3_bios, 2=s3_mode, 3=both
@@ -106,6 +121,7 @@ suspend_video()
 	quirk "${QUIRK_S3_BIOS}" && 		acpi_flag=$(($acpi_flag + 1))
 	quirk "${QUIRK_S3_MODE}" && 		acpi_flag=$(($acpi_flag + 2))
 	[ 0 -ne $acpi_flag ] && sysctl -w kernel.acpi_video_flags=$acpi_flag
+	smart_kernel_video && return
 	
 	quirk "${QUIRK_VBESTATE_RESTORE}" && 	vbe_savestate
 	quirk "${QUIRK_VBEMODE_RESTORE}" && 	vbe_savemode
@@ -116,6 +132,7 @@ suspend_video()
 }
 resume_video()
 {
+	smart_kernel_video && return
 	# We might need to do one or many of these quirks
 	quirk "${QUIRK_VBE_POST}" && 		vbe_post
 	quirk "${QUIRK_VBESTATE_RESTORE}" && 	vbe_restorestate