psb_gfx removal

[Jan Engelhardt]

On Tuesday 2012-06-05 18:29, Alan Cox wrote:
>> 
>> [Wortmann AG's terra Pad 1051, with a 8086:4102 display chip]
>
>0x4102 is an Oaktrail device (GMA600). The driver supports it providing
>you have the GMA600 option set.

Thanks for the info. Setting GMA600=y works, as in, it results
in graphical mode on tty1.

However, the gma600 driver seems to default to a backlight value of
"0" in Linux 3.4.1; getting a dark screen after loading gma500_gfx.ko 
is rather unexpected.

Furthermore, there are four entries in sysfs, and the one required to
change the panel brightness is acpi_video2 (and this one alone).
Changing any others, e.g. acpi_video0/brightness, does not have any
visible effect.

linux-kisn:/sys/class/backlight # ls -l
total 0
lrwxrwxrwx 1 root root 0 Jun  7 17:31 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 Jun  7 17:31 acpi_video1 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1
lrwxrwxrwx 1 root root 0 Jun  7 17:31 acpi_video2 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video2
lrwxrwxrwx 1 root root 0 Jun  7 17:31 oaktrail-bl -> ../../devices/virtual/backlight/oaktrail-bl