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platform/x86: thinkpad_acpi: not loading brightness_init when _BCL invalid

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When _BCL invalid, disable thinkpad_acpi backlight brightness control.

brightness_enable is already checked at the beginning.
Most new thinkpads are using GPU driver to control brightness now,
print notice when enabled brightness control even when brightness_enable = 1.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Aaron Ma 2020-07-10 09:56:14 +08:00 committed by Andy Shevchenko
parent acf7f4a591
commit 46713aeee1
1 changed files with 5 additions and 2 deletions
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7
drivers/platform/x86/thinkpad_acpi.c
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@ -6963,10 +6963,13 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
pr_warn("Cannot enable backlight brightness support, ACPI is already handling it. Refer to the acpi_backlight kernel parameter.\n");
return 1;
}
} else if (tp_features.bright_acpimode && brightness_enable > 1) {
pr_notice("Standard ACPI backlight interface not available, thinkpad_acpi native brightness control enabled\n");
} else if (!tp_features.bright_acpimode) {
pr_notice("ACPI backlight interface not available\n");
return 1;
}
pr_notice("ACPI native brightness control enabled\n");
/*
* Check for module parameter bogosity, note that we
* init brightness_mode to TPACPI_BRGHT_MODE_MAX in order to be