PROBLEM: LCD display dead after ACPI suspend to RAM (S3)

["Georg C. F. Greve" <greve@gnu.org>]

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Hi all,

on an ASUS M2400N [*] with both plain vanilla Linux Kernel 2.6.1 and
2.6.1 + acpi-20031203, the machine appears to suspend to RAM without a
problem and it also apparently comes back, but the screen is dead.

Here is the dmesg output for the suspend to RAM / resume cycle:


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PM: Preparing system for suspend
Stopping tasks: ============================================|
hdc: start_power_step(step: 0)
hdc: completing PM request, suspend
hda: start_power_step(step: 0)
hda: start_power_step(step: 1)
hda: complete_power_step(step: 1, stat: 50, err: 0)
hda: completing PM request, suspend
PM: Entering state.
Back to C!
PM: Finishing up.
PCI: Enabling device 0000:00:1f.5 (0005 -> 0007)
PCI: Setting latency timer of device 0000:00:1f.5 to 64
AC'97 warm reset still in progress? [0xffffffff]
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x0
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x20
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x4
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x4
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x6
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x6
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0xa
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0xa
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0xc
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0xc
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0xe
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0xe
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x10
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x10
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x12
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x12
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x14
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x14
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x16
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x16
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x18
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x18
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x1a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x1a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x1c
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x1c
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x20
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x20
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x22
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x22
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x2a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x2c
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x2c
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x32
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x32
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 0: semaphore is not ready for register 0x3a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 0: semaphore is not ready for register 0x3a
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x0
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x20
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x26
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x2
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_write 1: semaphore is not ready for register 0x1c
codec_semaphore: semaphore is not ready [0xff][0xffffffff]
codec_read 1: semaphore is not ready for register 0x1c
hda: Wakeup request inited, waiting for !BSY...
hda: start_power_step(step: 1000)
hda: completing PM request, resume
hdc: Wakeup request inited, waiting for !BSY...
hdc: start_power_step(step: 1000)
hdc: completing PM request, resume
Restarting tasks...<6>Synaptics Touchpad, model: 1
 Firmware: 4.6
 180 degree mounted touchpad
 Sensor: 18
 new absolute packet format
 Touchpad has extended capability bits
 -> four buttons
 -> multifinger detection
 -> palm detection
 done
input: SynPS/2 Synaptics TouchPad on isa0060/serio4
MCE: The hardware reports a non fatal, correctable incident occurred on CPU 0.
Bank 1: f200000000000175

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When trying to get/set the LCD status via /proc/acpi/asus/lcd, dmesg
shows

 Asus ACPI: Error reading LCD status
 Asus ACPI: Error switching LCD

Suggestions, anyone? If you need more info, let me know.

Regards,
Georg


[*] /proc/acpi/asus/info:

Model reference    : M2X
SFUN value         : 0x0a7f
DSDT length        : 27945
DSDT checksum      : 212
DSDT revision      : 1
OEM id             : 0ABBD
OEM table id       : 0ABBD001
OEM revision       : 0x1
ASL comp vendor id : MSFT
ASL comp revision  : 0x100000d

-- 
Georg C. F. Greve                                       <greve@gnu.org>
Free Software Foundation Europe	                 (http://fsfeurope.org)
Brave GNU World	                           (http://brave-gnu-world.org)