Messages in this thread | | | Date | Mon, 14 Feb 2005 13:13:30 +0100 (CET) | Subject | Re: [PATCH, new ACPI driver] new sony_acpi driver | From | "Jean Delvare" <> |
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Hi Stelian, all,
On 2005-02-14, Stelian Pop wrote: > I have some interesting information from one user, who noticed that: > > * pbr is the power-on brightness. It's the brightness that the > laptop uses at power-on time.
Hey, that makes full sense. After playing around with the debug mode, I noticed that the brightness was at the minimum level on next boot. I thought it was related to the fact that I didn't have the opportunity to stop my system cleanly, but it is indeed possible that I had written 0 to pbr before the crash. Will test this evening.
This reminds me of a related thing I had noticed some times ago but couldn't explain back then. Brightness changes made under Linux using spicctrl always seemed to be temporary (lost over reboot) while those made under Windows on the same laptop were permanent (preserved over reboot). Now I have to believe that spicctrl was only changing brt, while the Windows tool was probably changing both brt and pbr?
So, what about either renaming pbr to brightness_default, or making the brightness file dual-valued (several acpi files do that already)? And I guess that the pbr value would need to be limited to the 0-8 range just like is done for brt.
> * cdp is the CD-ROM power. Writing 0 to cdp turns off the cdrom in > order to save a bit of power consumption.
I don't seem to have cdp on my system. Is this something I need to manually activate in the driver, or does it simply mean that my laptop doesn't support that feature?
Thanks, -- Jean Delvare - 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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