Public bug reported:
Hello!
I found that current build config for Linux 5.9 and 5.10 in mainline PPA
break brightness adjustment on Linux Miix2 8 tablet. Brightness can not
be adjusted and doesn't turn off during suspend.
Relevant build options:
CONFIG_I2C_DESIGNWARE_PLATFORM
CONFIG_INTEL_SOC_PMIC
CONFIG_GPIO_CRYSTAL_COVE
CONFIG_PWM_CRC
CONFIG_PMIC_OPREGION
CONFIG-BYTCRC_PMIC_OPREGION,
When all these build options is set to y I can no longer reproduce this issue.
I also think that enabling other related PMIC_OPREGION build options could help
other BayTrail/CherryTrail-based devices as well:
CONFIG_CHTCRC_PMIC_OPREGION=y
CONFIG_XPOWER_PMIC_OPREGION=y
CONFIG_BXT_WC_PMIC_OPREGION=y
CONFIG_CHT_WC_PMIC_OPREGION=y
CONFIG_CHT_DC_TI_PMIC_OPREGION=y
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1907647
Title:
Linux 5.9/5.10 build config break brightness adjustment on Lenovo
Miix2 8
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