On Monday, July 22, 2013 03:15:38 PM Martin Steigerwald wrote: > Am Montag, 22. Juli 2013, 15:02:22 schrieb Rafael J. Wysocki: > > On Monday, July 22, 2013 12:08:40 AM James Hogan wrote: > > > On 21 July 2013 20:53, Linus Torvalds <torva...@linux-foundation.org> > wrote: > > > > (b) we had a late change to how ACPI backlight handling is done on > > > > > > > > certain machines, and while this kind of thing really shouldn't be > > > > done outside the merge window, I ended up pulling it anyway. But I'd > > > > *really* like to have people test this thing particularly on laptops > > > > with intel-based graphics. It should only matter (and hopefully > > > > improve things) for the newer ones with BIOSes designed for Windows 8, > > > > but hey, the more testing, the better. Backlight handling has beenin > > > > painful before, so I'm mentioning this explicitly. > > > > > > 8c5bd7a "ACPI / video / i915: No ACPI backlight if firmware expects > > > Windows 8" breaks backlight control for me because > > > /sys/class/backlight/acpi_video0 disappears, and > > > /sys/class/backlight/intel_backlight doesn't seem to have any effect. > > > > > > Note that acpi_video0 only worked because I was applying "[PATCH] > > > drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight" [1], so > > > strictly speaking mainline already didn't work. > > > > James, sorry for breaking things for you. The patch you're mentioning is > > going to hit the mainline at one point anyway I suppose. > > Dunno whether thats related, but after locking screen today and screen > blanker > kicking in (just a blank screen), I was not able to reactivate the display > again by typing a key or so unless I closed the laptop display lid, let the > machine suspend (to ram) and opened it again. > > Plain 3.11-rc2 on ThinkPad T520:
Well, please try to revert commits efaa14c and 8c5bd7a (in this order) and see if that helps. Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
