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? 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. > > -- 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
