I am on Linux Mint 17 Cinnamon, and when pressing the brightness hotkeys on my Thinkpad laptop, the brightness animation slider does show up, and the "brightness" file value is changed located in /sys/class/backlight/____/", however the brightness does not change as I press the hotkeys.
However, if I close the laptop / suspend it, then when I re-open it, the brightness value is changed correctly.
-I have tried a few solutions, the popular one involving changing my grub file to include this "acpi_backlight=vendor" command. The only thing that that seems to change is the name of the folder (the red blank above) from "acpi_video0" to "thinkpad_screen". The contents of these folders are the same, the brightness file is adjusted correctly, but brightness is still not updated.
-Next is to try xbacklight, that did nothing that I could discern.
-Then there's editing a xorg.conf file, however I could not find that file where the guides told me.
So now what would you folks recommend?
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System: Host: *** Kernel: 3.13.0-24-generic x86_64 (64 bit, gcc: 4.8.2) Desktop: N/A Distro: Linux Mint 17 Qiana
Machine: System: LENOVO product: 4389AB8 version: ThinkPad W510
Mobo: LENOVO model: 4389AB8 Bios: LENOVO version: 6NET84WW (1.45 ) date: 10/03/2012
CPU: Quad core Intel Core i7 CPU Q 720 (-HT-MCP-) cache: 6144 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 12769.4
Clock Speeds: 1: 933.00 MHz 2: 933.00 MHz 3: 933.00 MHz 4: 933.00 MHz 5: 933.00 MHz 6: 1600.00 MHz 7: 933.00 MHz 8: 933.00 MHz
Graphics: Card: NVIDIA GT216GLM [Quadro FX 880M] bus-ID: 01:00.0
X.org: 1.15.1 drivers: nvidia (unloaded: fbdev,vesa,nouveau) tty size: 104x24 Advanced Data: N/A for root
Audio: Card-1: Intel 5 Series/3400 Series Chipset High Definition Audio driver: snd_hda_intel bus-ID: 00:1b.0
Card-2: NVIDIA GT216 HDMI Audio Controller driver: snd_hda_intel bus-ID: 01:00.1
Sound: Advanced Linux Sound Architecture ver: k3.13.0-24-generic
Network: Card-1: Intel Centrino Ultimate-N 6300 driver: iwlwifi ver: in-tree: bus-ID: 03:00.0
IF: wlan0 state: up mac: <filter>
Card-2: Intel 82577LM Gigabit Network Connection driver: e1000e ver: 2.3.2-k port: 1820 bus-ID: 00:19.0
IF: eth0 state: down mac: <filter>
Drives: HDD Total Size: 250.1GB (69.6% used) 1: id: /dev/sda model: WDC_WD2500BEVT size: 250.1GB temp: 39C
Partition: ID: / size: 12G used: 9.6G (91%) fs: ext4 ID: swap-1 size: 8.52GB used: 0.00GB (0%) fs: swap
RAID: No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors: System Temperatures: cpu: 47.0C mobo: 0.0C gpu: 0.0:46C
Fan Speeds (in rpm): cpu: 2743 Code: Select all
[ 25.416431] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[ 25.416434] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...