acpi/x86: add a kernel parameter to disable ACPI BGRT
BGRT is for displaying seamless OEM logo from booting to login screen; however, this mechanism does not always work well on all configurations and the OEM logo can be displayed multiple times. This looks worse than without BGRT enabled. This patch adds a kernel parameter to disable BGRT in boot time. This is easier than re-compiling a kernel with CONFIG_ACPI_BGRT disabled. Signed-off-by: Alex Hung <alex.hung@canonical.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -450,6 +450,9 @@
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bert_disable [ACPI]
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Disable BERT OS support on buggy BIOSes.
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bgrt_disable [ACPI][X86]
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Disable BGRT to avoid flickering OEM logo.
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bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
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bttv.radio= Most important insmod options are available as
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kernel args too.
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@ -45,6 +45,7 @@ EXPORT_SYMBOL(acpi_disabled);
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#define PREFIX "ACPI: "
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int acpi_noirq; /* skip ACPI IRQ initialization */
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int acpi_nobgrt; /* skip ACPI BGRT */
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int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
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EXPORT_SYMBOL(acpi_pci_disabled);
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@ -1619,7 +1620,7 @@ int __init acpi_boot_init(void)
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acpi_process_madt();
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acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
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if (IS_ENABLED(CONFIG_ACPI_BGRT))
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if (IS_ENABLED(CONFIG_ACPI_BGRT) && !acpi_nobgrt)
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acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
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if (!acpi_noirq)
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@ -1671,6 +1672,13 @@ static int __init parse_acpi(char *arg)
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}
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early_param("acpi", parse_acpi);
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static int __init parse_acpi_bgrt(char *arg)
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{
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acpi_nobgrt = true;
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return 0;
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}
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early_param("bgrt_disable", parse_acpi_bgrt);
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/* FIXME: Using pci= for an ACPI parameter is a travesty. */
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static int __init parse_pci(char *arg)
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{
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