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From"Rafael J. Wysocki" <>
SubjectRe: 2.6.38-rc2: acpi backlight control missing
DateSat, 22 Jan 2011 20:43:07 +0100
On Saturday, January 22, 2011, Thomas Meyer wrote:
> with 2.6.38-rc2 the acpi backlight is gone:
>
> $ ll /sys/devices/virtual/backlight
> ls: cannot access /sys/devices/virtual/backlight: No such file or directory
>
> $ ll /sys/class/backlight/
> total 0
>
> with 2.6.37:
> $ ll /sys/devices/virtual/backlight
> insgesamt 0
> drwxr-xr-x. 3 root root 0 22. Jan 2011 acpi_video0
>
> $ ll /sys/class/backlight/
> insgesamt 0
> lrwxrwxrwx. 1 root root 0 22. Jan 2011 acpi_video0
> -> ../../devices/virtual/backlight/acpi_video0
>
> dmesg:
>
> $ grep -i video dmesg-3*.txt
> dmesg-37.txt:[ 0.216370] pci 0000:00:02.0: Boot video device
> dmesg-37.txt:[ 1.102662] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input4
> dmesg-37.txt:[ 1.102670] ACPI: Video Device [OVGA] (multi-head: yes rom: no post: no)
> dmesg-37.txt:[ 18.843946] Linux video capture interface: v2.00
> dmesg-37.txt:[ 19.189825] uvcvideo: Found UVC 1.00 device WebCam (064e:a102)
> dmesg-37.txt:[ 19.207062] usbcore: registered new interface driver uvcvideo
> dmesg-37.txt:[ 19.207065] USB Video Class driver (v1.0.0)
> dmesg-38.txt:[ 0.215527] pci 0000:00:02.0: Boot video device
> dmesg-38.txt:[ 19.466882] Linux video capture interface: v2.00
> dmesg-38.txt:[ 19.503083] uvcvideo: Found UVC 1.00 device WebCam (064e:a102)
> dmesg-38.txt:[ 19.520292] usbcore: registered new interface driver uvcvideo
> dmesg-38.txt:[ 19.520295] USB Video Class driver (v1.0.0)
>
> $ grep ACPI_VIDEO /boot/config-2.6.3[78]*
> /boot/config-2.6.37:CONFIG_ACPI_VIDEO=y
> /boot/config-2.6.38-rc2:CONFIG_ACPI_VIDEO=y
>
> any ideas?

Not really, but Matthew may have some (CCed).

Thanks,
Rafael


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