diff options
| author | Colin Ian King <colin.king@canonical.com> | 2011-05-23 15:06:50 +0100 |
|---|---|---|
| committer | Andy Whitcroft <apw@canonical.com> | 2012-01-05 12:12:14 +0000 |
| commit | cdabe2fd6c0016fec1a561dcd5dc412a691106d2 (patch) | |
| tree | beb2b6564d8a9c2146f75a8274516cc536d54a0a /Documentation | |
| parent | c07012dc9776706920c3a6762719aad74139a53a (diff) | |
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.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 81c287fad79..d00d531d14a 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -252,12 +252,15 @@ 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 |