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@xxxxxxx> >>> To: "Cork" <kernel@xxxxxxxxxxxx> >>> Cc: linux-acpi@xxxxxxxxxxxxxxx, "Aaron Lu" <aaron.lu@xxxxxxxxx> >>> 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. >>> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
