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Only need to set brightness if reading the initial state fails

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to sync firmware and the driver. Avoids black screen at boot time.
Thanks to jmcneill@
This commit is contained in:
sborrill 2020-06-30 13:14:21 +00:00
parent 6d91546d37
commit a39749b012
1 changed files with 4 additions and 4 deletions
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8
sys/dev/acpi/acpi_display.c
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@ -1,4 +1,4 @@
/* $NetBSD: acpi_display.c,v 1.17 2020/04/28 11:02:37 jmcneill Exp $ */
/* $NetBSD: acpi_display.c,v 1.18 2020/06/30 13:14:21 sborrill Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
@ -66,7 +66,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_display.c,v 1.17 2020/04/28 11:02:37 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: acpi_display.c,v 1.18 2020/06/30 13:14:21 sborrill Exp $");
#include <sys/param.h>
#include <sys/device.h>
@ -647,8 +647,8 @@ acpidisp_out_attach(device_t parent, device_t self, void *aux)
* Synchronize ACPI and driver brightness levels, and
* check that brightness control is working.
*/
(void)acpidisp_get_brightness(osc, &bc->bc_current);
if (acpidisp_set_brightness(osc, bc->bc_current)) {
if (acpidisp_get_brightness(osc, &bc->bc_current) &&
acpidisp_set_brightness(osc, bc->bc_current)) {
kmem_free(bc->bc_level,
bc->bc_level_count * sizeof(*bc->bc_level));
kmem_free(bc, sizeof(*bc));