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acpi/x86: add a kernel parameter to disable ACPI BGRT

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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>
This commit is contained in:
Alex Hung
2020-03-04 15:55:29 -07:00
committed by Rafael J. Wysocki
parent fa0fca68e1
commit 1ffb8d032d
2 changed files with 12 additions and 1 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -450,6 +450,9 @@
bert_disable [ACPI]
Disable BERT OS support on buggy BIOSes.
bgrt_disable [ACPI][X86]
Disable BGRT to avoid flickering OEM logo.
bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
bttv.radio= Most important insmod options are available as
kernel args too.