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Commit d64c81c4 authored by Henrique de Moraes Holschuh's avatar Henrique de Moraes Holschuh Committed by Len Brown
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ACPI: thinkpad-acpi: Remove firmware backlight delays for Intel ACPI IGD OpRegion 



Based on analysis and a patch from Matthew Garrett <mjg59@srcf.ucam.org>.

Instruct the ThinkPad ACPI firmware to remove delays on the processing of
backlight brightness changes.  This method is present on ThinkPad
Vista-compatible BIOSes with standard ACPI backlight level control.

Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Yves-Alexis Perez <corsac@debian.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 39629323

drivers/misc/thinkpad_acpi.c

+11 −0
Original line number Diff line number Diff line
@@ -838,6 +838,13 @@ static int parse_strtoul(const char *buf, 
	return 0;

}



static void tpacpi_disable_brightness_delay(void)

{

	if (acpi_evalf(hkey_handle, NULL, "PWMS", "qvd", 0))

		printk(TPACPI_NOTICE

			"ACPI backlight control delay disabled\n");

}



static int __init tpacpi_query_bcl_levels(acpi_handle handle)

{

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -2139,6 +2146,8 @@ static int __init hotkey_init(struct ibm_init_struct *iibm) 
	if (!tp_features.hotkey)

		return 1;



	tpacpi_disable_brightness_delay();



	hotkey_dev_attributes = create_attr_set(13, NULL);

	if (!hotkey_dev_attributes)

		return -ENOMEM;
@@ -2512,6 +2521,8 @@ static void hotkey_suspend(pm_message_t state) 


static void hotkey_resume(void)

{

	tpacpi_disable_brightness_delay();



	if (hotkey_mask_get())

		printk(TPACPI_ERR

		       "error while trying to read hot key mask "