backlight toggle blanks screen

[sceaduw]

Hi,

Not sure if this is a Linux On My Samsung issue or not. I've got a Samsung N210 with a fancy-pants Pixel Qi screen. On Ubuntu 11.04 with the samsung-tools, I could toggle the backlight off, and then still use the display (outside or wherever) because the pixel-qi screen doesn't need the backlight to be useable.

I just "upgraded" to 11.10 and with the samsung-tools 2.0, the backlight toggle appears to be blanking the screen instead of just turning off the backlight. Anybody know which piece is doing that? This is an unfortunate regression.

Thanks!

[voria]

Try to add the option "acpi_backlight=vendor" to the kernel command line, this should fix the problem.

[sceaduw]

Looks like acpi_backlight=vendor was already set by default and it still isn't working.

However, maybe this is a kernel/acpi bug then (or not implemented feature).

Thanks!

[JohnProg]

I have "Samsung n150 plus" with display "Pixel Qi 10.1". I have the same problem. System Ubuntu 12.04. I want to solve this problem. Please, help me. Thanks!