Hi Marco, On 07/04/2011 12:58 PM, Marco Chiappero wrote: > Il 04/07/2011 10:46, Michel Alexandre Salim ha scritto: > Hi Michel, > >> Let me know if you need anything else. Once we can at least pinpoint the >> problem to the right subsystem, I'll add these attachments to the >> correct bug report. > > Both this behavior and the ASL is confusing, so it's not easy to say > where is the problem exactly, but BNEN, BNCM, BNDM, BNVE are set to 0. > This affects for sure the SBRT/GBRT methods used by sony-laptop (that's > why they do not work), I can't say about _BCM/_BQC methods used by the > acpi video driver (which is preferable). However, since _BCM calls no > GFX methods and only acts on the EC, it might start to work after > setting those bits to 1. The real question is why those bits are low, is > there any issue during the EC initialization? That said, the issue > doesn't seem to belong to sony-laptop and video drivers. You can try to > temporarily fix the problem setting to 1 those bits (but it is not a > solution), just compile and run the attached program. Please report back > if it works, and if it works for both backlight controls. > Unfortunately, the results are, again, rather confusing. With sony-laptop.ko, after running backlight_fix once, actual_brightness has a nonsensical value -- 55. I tried setting it to 5, and something actually happens this time - actual_brightness now reads 5 rather than -1, and the screen brightness actually changes -- but, alas, too much (if the brightness range is from 0 to 7, 5 should be rather bright, instead it looked more like a 2 to me). Further attempts to adjust brightness produced no result -- actual_brightness now tallies with brightness, like the video.ko's behavior, but the screen remained dim. Repeatedly running backlight_fix does not resolve matter either. With the video.ko driver, backlight_fix appears to have no effect. Anything else I can try? I've not tried Rui's solution yet, as I haven't found a kernel tree where the patches would apply *and* build cleanly yet. Thanks, -- Michel Alexandre Salim () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
