On Thu, Oct 4, 2012 at 11:01 AM, joeyli <jlee@xxxxxxxx> wrote:
> 於 三，2012-10-03 於 08:26 -0400，Dan 提到：
>> >> Acpidump is attached.
>> >>
>> >
>> > I traced your DSDT at this morning, didn't see problem in _BCL, _BCM
>> and
>> > _BQC.
>> > Per DSDT, the _BQC on this machine used brightness value but not
>> index,
>> > so 'video.use_bios_initial_backlight=0' should works to you for set
>> the
>> > backlight to max_level when acpi/video driver loaded.
>> >
>> > And, the value of max_level in package of _BCL is 100, there have no
>> 0
>> > value in level list:
>> >
>> > Method (_BCL, 0, NotSerialized)
>> > {
>> > Return (Package (0x0C)
>> > {
>> > 0x46, /* level on AC */
>> > 0x28, /* level on Battery */
>> > 0x0A, /* 10 */
>> > 0x14, /* 20 */
>> > 0x1E,
>> > 0x28,
>> > 0x32,
>> > 0x3C,
>> > 0x46,
>> > 0x50,
>> > 0x5A,
>> > 0x64 /* 100 */
>> >
>> > That strange for 'video.use_bios_initial_backlight=0' doesn't work
>> to
>> > you for set the backlight level to maximum.
>> > Could you please share the acpi debug log? Please add the following
>> > kernel parameter when system boot. Please also check the kernel
>> config
>> > need CONFIG_ACPI_DEBUG=y:
>> >
>> > acpi.debug_level=0x0000000F acpi.debug_layer=0xffffffff
>> log_buf_len=5M
>> >
>> > Please attached on your dmesg or boot message after system boot
>> finished. Hope we
>> > can find any hint from acpi debug log.
>> >
>> >
>> > Thanks a lot!
>> > Joey Lee
>> >
>>
>> I've attached the resulting dmesg log. I also set the loglevel to 8
>> during this so I could watch the messages on the console. The last
>> message I could see before the backlight went out was at 5.93 seconds.
>> I tried looking through the log around there, but it's over my head.
>>
>> Thank you,
>> Dan
>>
>
> Thanks for your acpi debug log.
>
> Per acpi debug log, the DD02 device have backlight control capability.
> The default brightness value is 30, acpi/video driver set brightness
> value to 100 then set it back to 30 for determine does _BQC use index
> but not brightness level:
>
> [ 3.113825] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCL] (Node ffff88007b741c58)
> [ 3.115980] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node ffff88007b741ca8)
> [ 3.118310] exregion-0302 [00] ex_system_io_space_han: System-IO (width 32) R/W 1 Address=0000000000000080
> [ 3.220145] utils-0286 [00] evaluate_integer : Return value [30] <=== default brightness value is 30(default value set by BIOS)
> [ 3.222315] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCM] (Node ffff88007b741c80)
> [ 3.225422] exregion-0302 [00] ex_system_io_space_han: System-IO (width 8) R/W 1 Address=0000000000000072
> [ 3.227947] exregion-0302 [00] ex_system_io_space_han: System-IO (width 8) R/W 1 Address=0000000000000073
> [ 3.230424] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node ffff88007b741ca8)
> [ 3.233123] exregion-0302 [00] ex_system_io_space_han: System-IO (width 32) R/W 1 Address=0000000000000080
> [ 3.333487] utils-0286 [00] evaluate_integer : Return value [100] <=== set to 100 for determine _BQC_use_index
> [ 3.336019] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCM] (Node ffff88007b741c80)
> [ 3.339263] exregion-0302 [00] ex_system_io_space_han: System-IO (width 8) R/W 1 Address=0000000000000072
> [ 3.342167] exregion-0302 [00] ex_system_io_space_han: System-IO (width 8) R/W 1 Address=0000000000000073
> [ 3.345001] video-0734 [00] video_init_brightness : found 10 brightness levels
> [ 3.347899] utils-0286 [00] evaluate_integer : Return value [131072]
> [ 3.350956] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node ffff88007b741ca8)
> [ 3.354598] exregion-0302 [00] ex_system_io_space_han: System-IO (width 32) R/W 1 Address=0000000000000080
> [ 3.456824] utils-0286 [00] evaluate_integer : Return value [30] <=== set brightness value back to 30
> [ 3.460059] acpi device:28: registered as cooling_device0
>
> The above acpi/video's behavior is normal, didn't see strange thing.
> Please add 'video.use_bios_initial_backlight=0' then grab acpi debug log
> again. You can find the similar log of DD02 device, this time the latest
> 'Return value' should be 100 like: Return value [100].
>
> If 'video.use_bios_initial_backlight=0' works fine, the brightness
> should set to 100%, means lightest.
>
>
> Another dubious message in your dmesg is not from ACPI, it's a message
> from i915 driver:
> [ 2.083603] i915: fixme: max PWM is zero
>
> That means ODM set PWM register value default to zero, this register
> used to control the the intensity of the backlight. I am still looking
> what's the side effect that was caused by 'PWM = 0'.
>
>
> Thanks a lot!
> Joey Lee
>
Output is as expected with 'video.use_bios_initial_backlight=0'
[ 1.658690] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCL] (Node
ffff88007b741c58)
[ 1.658756] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node
ffff88007b741ca8)
[ 1.659083] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 32) R/W 1 Address=0000000000000080
[ 1.756824] utils-0286 [00] evaluate_integer : Return value [30]
[ 1.756839] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCM] (Node
ffff88007b741c80)
[ 1.757720] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 8) R/W 1 Address=0000000000000072
[ 1.757788] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 8) R/W 1 Address=0000000000000073
[ 1.757823] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node
ffff88007b741ca8)
[ 1.758093] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 32) R/W 1 Address=0000000000000080
[ 1.856768] utils-0286 [00] evaluate_integer : Return value [100]
[ 1.856782] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BCM] (Node
ffff88007b741c80)
[ 1.857607] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 8) R/W 1 Address=0000000000000072
[ 1.857680] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 8) R/W 1 Address=0000000000000073
[ 1.857710] video-0734 [00] video_init_brightness : found 10
brightness levels
[ 1.857735] utils-0286 [00] evaluate_integer : Return value [131072]
[ 1.857851] ACPI: Execute Method [\_SB_.PCI0.OVGA.DD02._BQC] (Node
ffff88007b741ca8)
[ 1.858179] exregion-0302 [00] ex_system_io_space_han: System-IO
(width 32) R/W 1 Address=0000000000000080
[ 1.956845] utils-0286 [00] evaluate_integer : Return value [100]
[ 1.956967] acpi device:28: registered as cooling_device0
Looks like this is happening independently of what the brightness
level is set to. 30% is what I usually have it set to (corresponds to
2 in /sys/class/backlight/acpi_video0/brightness). With
'video.use_bios_initial_backlight=0' The brightness is reset to max,
but the blackout still occurs later in the boot process.
I followed up on that other message from the i915 driver. I applied
this patch and rebuilt the kernel: https://lkml.org/lkml/2012/9/14/377
This should work around it from my (low level of) understanding. I
received the message "i915 doesn't seem to be connected to backlight"
in dmesg as expected, but still the backlight goes out.
Thank you for your help on this.
- Dan
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