Re: Sys backlight is empty since landing of "ACPI / PCI: Make PCI root driver use struct acpi_scan_handler"

[Cork <kernel@box.qzdev.se>]

Yes, 3.10.0-rc6 fixes the problem (sorry for not checking this before contacting you).

Rafael:
3.8:      /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:18/LNXVIDEO:00
3.9:      /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:18/LNXVIDEO:00
3.10-rc6: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:19/LNXVIDEO:00

// Cork

----- Original Message -----
> From: "Aaron Lu" <aaron.lu@intel.com>
> To: "Rafael J. Wysocki" <rjw@sisk.pl>, "Cork" <kernel@box.qzdev.se>
> Cc: linux-acpi@vger.kernel.org
> Sent: Thursday, 27 June, 2013 3:38:49 AM
> Subject: Re: Sys backlight is empty since landing of "ACPI / PCI: Make PCI root driver use struct acpi_scan_handler"
> 
> On 06/27/2013 06:08 AM, Rafael J. Wysocki wrote:
> > On Wednesday, June 26, 2013 08:38:49 PM Cork wrote:
> >> // Cork
> > 
> > OK, thanks.
> > 
> > The initialization ordering obviously changed in 3.9 and the ACPI
> > video
> > driver fails to find your backlight device.
> > 
> > Can you please tell me what the output of
> > 
> > $ find /sys/devices/ -name LNXVIDEO\*
> > 
> > is on your system in 3.9 and 3.8?
> 
> This should be the same problem as bug 58091, where one of the
> reporter
> is using a similar system Clevo_P150HMx. And I've checked the ACPI
> dump
> of Cork's system, there is also a _ROM method under PCI0.
> 
> Cork,
> Possible to test v3.10-rc6 or later kernels? There is a fix for your
> problem, thanks.
> 
> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=58091
> 
> -Aaron
> 
> > 
> > Rafael
> > 
> > 
> >>
> >> ----- Original Message -----
> >>> From: "Rafael J. Wysocki" <rjw@sisk.pl>
> >>> To: "Cork" <kernel@box.qzdev.se>
> >>> Cc: linux-acpi@vger.kernel.org, "Aaron Lu" <aaron.lu@intel.com>
> >>> Sent: Wednesday, 26 June, 2013 10:05:38 PM
> >>> Subject: Re: Sys backlight is empty since landing of "ACPI / PCI:
> >>> Make PCI root driver use struct acpi_scan_handler"
> >>>
> >>> On Wednesday, June 26, 2013 09:52:46 PM Rafael J. Wysocki wrote:
> >>>> On Wednesday, June 26, 2013 07:31:00 PM Cork wrote:
> >>>>> Hello. This is my first time sending a report like this, so
> >>>>> please excuse me if I'm missing some vital information.
> >>>>>
> >>>>> From updating the kernel in Arch linux to 3.9 the brightness
> >>>>> controls stopped working on my Clevo P0150HM. I have tried the
> >>>>> acpi_backlight=vendor boot parameter but it makes no
> >>>>> difference.
> >>>>>
> >>>>> While researching this problem I've found that
> >>>>> /sys/class/backlight is empty in the versions where the buttons
> >>>>> isn't working. Bisecting points to
> >>>>> 00c43b9682507dc622c03172fde1032e2a216e9d [1] as the first
> >>>>> commit
> >>>>> showing the symptoms.
> >>>>>
> >>>>> Attached is the output from journalctl -b _TRANSFORM=kernel for
> >>>>> the two versions. Not sure what other useful information I can
> >>>>> provide apart from that, so please direct me if there is
> >>>>> something missing.
> >>>>>
> >>>>> [1]
> >>>>> https://github.com/torvalds/linux/commit/00c43b9682507dc622c03172fde1032e2a216e9d
> >>>>
> >>>> Interesting.
> >>>>
> >>>> Please send the output of acpidump from your machine.
> >>>
> >>> Also please put initcall_debug into the kernel command line and
> >>> send
> >>> dmesg from
> >>> the working and not working kernels with that.
> >>>
> >>> Thanks,
> >>> Rafael
> >>>
> >>>
> >>> --
> >>> I speak only for myself.
> >>> Rafael J. Wysocki, Intel Open Source Technology Center.
> >>>
> 
>