Messages in this thread | | | Date | Tue, 14 Nov 2006 23:26:17 +0100 | From | "Miguel Ojeda" <> | Subject | Re: ACPI output/lcd/auxdisplay mess |
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On 11/14/06, James Simmons <jsimmons@infradead.org> wrote: > > I have noticed a bunch of patches coming in dealing with the same problem. How to handle displays > i.e LCD, CRT etc. We have a lcd class in video/backlight which no one is using. Because no one was > aware of it auxdisplay was created instead. Then we have the acpi code which wants a output class
Well, we were aware of video/backlight/* (read below). Anyway, auxdisplay doesn't create a class; it did in first versions, but right now it behaves just like a framebuffer, no classes in the playground (maybe you read a old version?).
> to handle powering down the display device. Plus the acpi layer does something very similar to the > framebuffer with getting edids and data relating to the display device. We really should place all > this handling in one standard place. To do this I need to know what all of you require. >
auxdisplay was discussed and created because lcd/backlight mean a primary LCD:
"Backlight & LCD device support" Enable this to be able to choose the drivers for controlling the backlight and the LCD panel on some platforms, for example on PDAs.
However, auxdisplay means "auxiliary display device drivers", not _the display_. In such folder we can put every auxiliar-optional-secundary-rare display (not just LCDs, framebuffers, ...) who has special requirements (like parport wiring, fixed refresh rate, different properties...). Also, things like "set_contrast", "max_constrast", "set_power"... didn't seem very appropriate.
There was a long discussion about this stuff and someone pointed out the existence of video/backlight/*, so, well, we were aware of such it. I think people prefered drivers/auxdisplay.
As people wish,
Miguel Ojeda
-- Miguel Ojeda http://maxextreme.googlepages.com/index.htm - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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