On Mon, Feb 14, 2005 at 01:13:30PM +0100, Jean Delvare wrote: > > 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,
something like that, yes. > or making the > brightness file dual-valued (several acpi files do that already)? I don't like much this. > And I > guess that the pbr value would need to be limited to the 0-8 range just > like is done for brt. Probably, I haven't tested it myself yet, so I don't know. > > * 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? sony_acpi doesn't create this node. But if it is supported on your system you should see 'method: name: GCDP' and 'method: name: SCDP' in the logs because sony_acpi does enumerate all the methods it finds for the snc device. If you see it you can create the cdp entry with a bit of copy&paste in the driver code... Stelian. -- Stelian Pop <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
