26bff5f099722fa7c38796a3ccd0e880cf1a524a introduced a regression in
ideapad_laptop (https://bugzilla.kernel.org/show_bug.cgi?id=110021).
I've created a quick fix as a pull request:
https://github.com/torvalds/linux/pull/236 Here's the patch, for
convenience:
*** drivers/platform/x86/ideapad-laptop.c.old 2015-12-27
03:48:36.243613843 -0500
--- drivers/platform/x86/ideapad-laptop.c 2015-12-27
03:49:28.310280733 -0500
*************** static int ideapad_acpi_add(struct platf
*** 933,939 ****
ideapad_sync_rfk_state(priv);
ideapad_sync_touchpad_state(priv);
! if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
ret = ideapad_backlight_init(priv);
if (ret && ret != -ENODEV)
goto backlight_failed;
--- 933,939 ----
ideapad_sync_rfk_state(priv);
ideapad_sync_touchpad_state(priv);
! if (acpi_video_get_backlight_type() != acpi_backlight_vendor) {
ret = ideapad_backlight_init(priv);
if (ret && ret != -ENODEV)
goto backlight_failed;
I've tested the patch on a Yoga 900 running 4.3.3 x86_64 with a few
other compatibility patches. Backlight controls work perfectly with it
applied.
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