On 07/30/2013 03:36 AM, * SAMÍ * wrote: > Hi Rafael, > > > did you commit a full revert? > Because I am experiencing quite weird things in rc3. > Do we have a bug opened to discuss about it? Yes we have: https://bugzilla.kernel.org/show_bug.cgi?id=52951 I'll look into this issue. Thanks, Aaron > > Here is what I can observe: > 1) During boot, probably when loading the driver, backlight gets off (or > to a level low enough to make me feel it is off) > 2) When I am playing with my Fn+x keys, I am getting a completely full / > completely low brightness with no intermediate steps > 3) When I am playing with my Fn+x keys while gnome brightness settings > panel is open, I am recovering intermediate steps but the Fn+x keys > behavior is inverted (the key supposed to lower the brightness make it > increase and vice-versa. Note that the gnome brightness indicator also > gets inverted). > 4) Playing with the mouse on gnome brightness settings is working, > except that on the minimum level, backlight gets off > 5) Writing to /sys/class/backlight/intel_backlight/brightness works > > > Regards > > On 07/25/2013 02:57 PM, Rafael J. Wysocki wrote: >> On Thursday, July 25, 2013 03:34:10 PM Jani Nikula wrote: >>> On Thu, 25 Jul 2013, "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: >>>> On Thursday, July 25, 2013 11:09:27 AM Jani Nikula wrote: >>>>> On Thu, 25 Jul 2013, "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: >>>>>> Well, I wonder what about the appended (untested) patch? >>>>> Rafael, before going there, I've been trying to wrap my (poor, rusty >>>>> after vacation) head around >>>>> >>>>> commit 8c5bd7adb2ce47e6aa39d17b2375f69b0c0aa255 >>>>> Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> >>>>> Date: Thu Jul 18 02:08:06 2013 +0200 >>>>> >>>>> ACPI / video / i915: No ACPI backlight if firmware expects Windows 8 >>>>> >>>>> and I can't see how it could work. >>>> Well, if it didn't work, people wouldn't see either improvement or breakage >>>> from it, but they do see that, so it evidently works. :-) >>> I didn't claim it didn't work, just that *I* didn't see how it could. ;) >>> >>>>> First, the ACPI_VIDEO_SKIP_BACKLIGHT flag seems to be checked before >>>>> it's actually set anywhere. >>>> Are you sure about that? >>>> >>>> acpi_video_bus_add() is the .add() callback routine for acpi_video_bus which >>>> in fact is an ACPI driver (the naming sucks, but I didn't invent it). This >>>> means that acpi_video_bus_add() can only be called *after* acpi_video_bus >>>> has been registered with the ACPI subsystem (and the driver core). That >>>> is done by acpi_bus_register_driver() and, guess what?, this happens in >>>> __acpi_video_register(). So clearly, acpi_video_bus_add() *cannot* run before >>>> __acpi_video_register(). >>> Right. I totally missed the call within the ternary operator. Thanks for >>> the explanation, and apologies for the noise. >>> >>>>> Second, with i915 that has opregion support, __acpi_video_register() >>>>> should only ever get called once. Which means the acpi_walk_namespace() >>>>> with video_unregister_backlight() should never get called in register. >>>>> >>>>> Please enlighten me. >>>> Actually, that's correct, so we don't need the whole >>>> video_unregister_backlight() thing, calling acpi_video_backlight_quirks() would >>>> be sufficient. >>>> >>>> Ah, one more reason to do a full revert. I'm thinking, though, that I'll leave >>>> acpi_video_backlight_quirks() as is so that it can be used by >>>> acpi_video_bus_(start)|(stop)_devices(), because that doesn't seem to cause >>>> problems to happen. >>> I observe that for the regular non-quirk acpi_video_register() call, >>> acpi_video_backlight_quirks() won't be called during register, but it >>> will get called later. This might have subtle effects later on, don't >>> you think? >> Yes, it might, but after dropping ACPI_VIDEO_SKIP_BACKLIGHT it should be OK. >> >>> As to the original problem, and your patch in this thread, what do you >>> think about having another value in acpi_backlight kernel parameter for >>> it? Having an i915 module parameter to tell acpi to use or not use >>> quirks seems odd, since the i915 is not really taking over >>> anything. It's just passing the info on to acpi. >> I agree, I'm going to send a full revert in a while and we'll think what to >> do about all that later. >> >> Thanks, >> Rafael >> >> > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
