I upgraded my Sony Vaio VPCYA1V9E from Wheezy to Jessie.
It now has these versions of packages:
xserver-xorg-video-intel 2:2.21.15-2+b2 amd64
linux-image-3.16.0-4-amd64 3.16.7-ckt25-1 amd64
As a test, I commented out all of /etc/X11/xorg.conf.
/var/log/Xorg.0.log then showed:
[166061.586] (II) intel(0): Creating default Display subsection in Screen sectio
n
"Default Screen Section" for depth/fbbpp 24/32
[166061.586] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[166061.586] (==) intel(0): RGB weight 888
[166061.586] (==) intel(0): Default visual is TrueColor
[166061.586] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics
[166061.587] (**) intel(0): Relaxed fencing enabled
[166061.587] (**) intel(0): Wait on SwapBuffers? enabled
[166061.587] (**) intel(0): Triple buffering? enabled
[166061.587] (**) intel(0): Framebuffer tiled
[166061.587] (**) intel(0): Pixmaps tiled
[166061.587] (**) intel(0): 3D buffers tiled
[166061.587] (**) intel(0): SwapBuffers wait enabled
[166061.587] (==) intel(0): video overlay key set to 0x101fe
[166061.587] (II) intel(0): Output LVDS1 has no monitor section
[166061.616] (--) intel(0): found backlight control interface /sys/class/backlight/acpi_video0
[166061.618] (II) intel(0): Output VGA1 has no monitor section
[166061.619] (II) intel(0): Output HDMI1 has no monitor section
[166061.619] (II) intel(0): Output DP1 has no monitor section
As in Wheezy, the X server thought it was changing the backlight
brightness, but the changes did not take effect.
Unlike in Wheezy, this newer version of xserver-xorg-video-intel
already supports Option "Backlight". My xorg.conf now contains
only the following settings:
Section "Device"
Option "Backlight" "intel_backlight"
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
/var/log/Xorg.0.log now shows:
[166953.670] (II) intel(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[166953.670] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[166953.670] (==) intel(0): RGB weight 888
[166953.670] (==) intel(0): Default visual is TrueColor
[166953.670] (**) intel(0): Option "Backlight" "intel_backlight"
[166953.670] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics
[166953.709] (**) intel(0): Relaxed fencing enabled
[166953.709] (**) intel(0): Wait on SwapBuffers? enabled
[166953.709] (**) intel(0): Triple buffering? enabled
[166953.709] (**) intel(0): Framebuffer tiled
[166953.709] (**) intel(0): Pixmaps tiled
[166953.709] (**) intel(0): 3D buffers tiled
[166953.709] (**) intel(0): SwapBuffers wait enabled
[166953.709] (==) intel(0): video overlay key set to 0x101fe
[166953.709] (II) intel(0): Output LVDS1 has no monitor section
[166953.709] (**) intel(0): found backlight control interface /sys/class/backlight/intel_backlight
[166953.711] (II) intel(0): Output VGA1 has no monitor section
[166953.712] (II) intel(0): Output HDMI1 has no monitor section
[166953.712] (II) intel(0): Output DP1 has no monitor section
and the backlight control is working OK.
Still, it would be better if it worked out of the box, without
requiring me to edit xorg.conf.
On the other hand, Sony Vaio VPCYA1V9E is a bit old now
(I don't know when this was manufactured, but the BIOS is from 2010),
so perhaps there aren't too many new installs nowadays.
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