On Monday, January 18, 2016 03:57:49 PM Andy Lutomirski wrote: > On Mon, Jan 18, 2016 at 3:54 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > > On Monday, January 18, 2016 03:04:28 PM Andy Lutomirski wrote: > >> On Mon, Jan 18, 2016 at 2:25 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > >> > On Monday, January 18, 2016 12:52:53 PM Andy Lutomirski wrote: > >> >> I'm running 4.4 with the pm+acpi-4.5-rc1-1 merged in. After pressing > >> >> the backlight hotkeys a couple times, things start to break. Poking > >> >> at hung thread stacks, it appears that calls to > >> >> acpi_video_handles_brightness_key_presses never return. > >> >> > >> >> It appears that the culprit is: > >> >> > >> >> commit aecbd9b1bff6afbe349921b406b99d285b412820 > >> >> Author: Adrien Schildknecht <adrien+dev@xxxxxxxxxxx> > >> >> Date: Mon Jan 4 23:22:28 2016 +0100 > >> >> > >> >> ACPI / video: driver must be registered before checking for keypresses > >> >> > >> >> Reverting that patch makes my laptop work again. > >> >> > >> >> I don't know what that patch is trying to do, but it looks highly > >> >> questionable to me. Why should an accessor wait for a potential > >> >> different driver to register something? I see no guarantee that it > >> >> will eve happen. > >> >> > >> >> This is a Dell XPS 13 9350. > >> > > >> > Should be fixed in my linux-next branch, can you please try that one? > >> > > >> > >> To avoid churning my laptop tree too much, I cherry-picked: > >> > >> ACPI / video: Add disable_backlight_sysfs_if quirk for the Toshiba > >> Satellite R830 > >> ACPI / video: Revert "thinkpad_acpi: Use > >> acpi_video_handles_brightness_key_presses()" > >> ACPI / video: Document acpi_video_handles_brightness_key_presses() a bit > >> ACPI / video: Fix using an uninitialized mutex / list_head in > >> acpi_video_handles_brightness_key_presses() > >> ACPI / video: Revert "ACPI / video: driver must be registered before > >> checking for keypresses" > >> > >> The result seems to work. Are you planning on sending these for 4.5? > > > > Yes, I am. > > > > Most likely on Wednesday (or Thursday if anything urgent shows up in the meantime). > > > > Sounds good. I'll keep testing. > > Some day my laptop will Just Work on a distro kernel :) Well, even then it'll help a lot if you run the mainline on it, so we know that it doesn't regress. Thanks, Rafael -- 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
