Same, after suspend not turning on.
Lenovo 80HE (Yoga 3 Pro generation)
Regression in 7.0.0-28 and just released 7.0.0-29
Reverted to 7.0.0-27 and it works.

lspci | grep -iE "vga|3d|display"
00:02.0 VGA compatible controller: Intel Corporation Broadwell-Y GT2 [HD 
Graphics 5300] (rev 09)

journalctl -b -1 -k | grep -n "assert_can_disable_lcpll"
kernel: WARNING: drivers/gpu/drm/i915/display/intel_display_power.c:1225 at 
assert_can_disable_lcpll+0x741/0x760 [i915], CPU#3: kworker/u16:20/10830
kernel: RIP: 0010:assert_can_disable_lcpll+0x747/0x760 [i915]
kernel: WARNING: drivers/gpu/drm/i915/display/intel_display_power.c:1232 at 
assert_can_disable_lcpll+0x5e4/0x760 [i915], CPU#3: kworker/u16:20/10830
RIP: 0010:assert_can_disable_lcpll+0x5ea/0x760 [i915]

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https://bugs.launchpad.net/bugs/2161359

Title:
  linux-modules-7.0.0-28-generic breaks backlight control on some
  laptops

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