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authorColin Ian King <colin.king@canonical.com>2011-05-23 15:06:50 +0100
committerJohn Rigby <john.rigby@linaro.org>2011-11-16 14:24:33 -0700
commit3cd25dfc627b72b95ee349f14b815c3636d82738 (patch)
tree7092916de73d45dd4f4195bf4f825da9845e3061 /Documentation
parentb2f3f54da81bb697ca2d729dabbe20038e43d7e9 (diff)
downloadlinux-linaro-precise-3cd25dfc627b72b95ee349f14b815c3636d82738.tar.gz
UBUNTU: SAUCE: S3 early resume debug via keyboard LEDs
Add support to debug S3 early resume by flashing the keyboard LEDs three times in the realmode path. This is useful to allow one to determine if S3 hangs occur in the BIOS or during the early resume phase. Add kernel parameter acpi_sleep=s3_leds to enable the s3 debugging option. This can also be enabled by writing 8 to /proc/sys/kernel/acpi_video_flags. Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Stefan Bader <stefan.bader@canonical.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index d6e6724446c..c8816bd9b63 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -251,12 +251,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
For broken nForce2 BIOS resulting in XT-PIC timer.
acpi_sleep= [HW,ACPI] Sleep options
- Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
+ Format: { s3_bios, s3_mode, s3_beep, s3_leds, s4_nohwsig,
old_ordering, nonvs, sci_force_enable }
See Documentation/power/video.txt for information on
s3_bios and s3_mode.
s3_beep is for debugging; it makes the PC's speaker beep
as soon as the kernel's real-mode entry point is called.
+ s3_leds is for debugging; it flashes the keyboard LEDs
+ 3 times as soon as the kernel's real-mode entry point is
+ called.
s4_nohwsig prevents ACPI hardware signature from being
used during resume from hibernation.
old_ordering causes the ACPI 1.0 ordering of the _PTS