View Single Post
Old 12-14-10, 07:12 PM   #1
Registered User
Join Date: Nov 2010
Posts: 7
Default No brightness control - Sony VAIO VPCCW2 and driver 260.19.29


I have a Sony Vaio VPCCW2 laptop with NVidia GT310M card. Brightness control using hotkeys is not working for me. I tried using the nvidiabl driver ( but it just leads to a black screen as posted here -

While going through the log, I noticed this message:
[    20.086] (WW) NVIDIA(0): ACPI: Error: Unable to find the brightness file path under
[    20.086] (WW) NVIDIA(0):     /proc/acpi/video. The NVIDIA X driver will not be able to
[    20.086] (WW) NVIDIA(0):     respond to ACPI brightness change hotkey events.
[    20.088] (II) NVIDIA(0): Setting mode "nvidia-auto-select"
Is there any way to get my laptop video brightness control supported 'upstream'? How do I get the required 'brightness' file in /proc/acpi/video?


PS: Brightness control works when using nouveau, but it has a very high value for max_brightness (in thousands), and hence most brightness applets fail, and I am forced to use acpi scripts.
Attached Files
File Type: gz nvidia-bug-report.log.gz (49.4 KB, 106 views)
rohandhruva is offline   Reply With Quote