[Bug 102343] [CHT] Screen remains black after opening lid on Asus T102HA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102343

--- Comment #7 from Ambroz Bizjak <ambrop7 at gmail.com> ---
I think it is not a duplicate of bug 96571. Backlight control works for me, and
there is no "Failed to own the PWM chip" error.

Note, to get backlight control and battery monitor to work I made these kernel
config changes (to default NixOS kernel):

I2C y
ACPI_I2C_OPREGION y
PWM y
PWM_CRC y
PWM_SYSFS y
PWM_LPSS y
PWM_LPSS_PCI y
PWM_LPSS_PLATFORM y
PWM_PCA9685 y
I2C_DESIGNWARE_PLATFORM y
I2C_DESIGNWARE_PCI y
INTEL_SOC_PMIC y

I used to get the "failed to own the PWM chip" error but not after these config
changes. Actually, if I do not do these changes then in addition to backlight
and battery control not working, the screen also does not turn off when the lid
is closed and remains on when it is reopened.

I do however see these errors in the kernel log (with the modified kernel
config):
ACPI Exception: Could not find/resolve named package element:
\_SB_.PCI0.I2C7.BATC (20170728/dspkginit-381)
ACPI Exception: Could not find/resolve named package element:
\_SB_.PCI0.I2C7.BATC (20170728/dspkginit-381)
ACPI Exception: Could not find/resolve named package element:
\_SB_.PCI0.I2C3.TIDR (20170728/dspkginit-381)

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