LKML Archive on
help / color / mirror / Atom feed
From: tip-bot for Stefan Lippers-Hollmann <>
Subject: [tip:x86/urgent] x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk
Date: Thu, 2 Apr 2015 05:28:12 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <20150330224427.0fb58e42@mir>

Commit-ID:  80313b3078fcd2ca51970880d90757f05879a193
Author:     Stefan Lippers-Hollmann <>
AuthorDate: Mon, 30 Mar 2015 22:44:27 +0200
Committer:  Ingo Molnar <>
CommitDate: Wed, 1 Apr 2015 14:08:09 +0200

x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk

The ASRock Q1900DC-ITX mainboard (Baytrail-D) hangs randomly in
both BIOS and UEFI mode while rebooting unless reboot=pci is
used. Add a quirk to reboot via the pci method.

The problem is very intermittent and hard to debug, it might succeed
rebooting just fine 40 times in a row - but fails half a dozen times
the next day. It seems to be slightly less common in BIOS CSM mode
than native UEFI (with the CSM disabled), but it does happen in either
mode. Since I've started testing this patch in late january, rebooting
has been 100% reliable.

Most of the time it already hangs during POST, but occasionally it
might even make it through the bootloader and the kernel might even
start booting, but then hangs before the mode switch. The same symptoms
occur with grub-efi, gummiboot and grub-pc, just as well as (at least)
kernel 3.16-3.19 and 4.0-rc6 (I haven't tried older kernels than 3.16).
Upgrading to the most current mainboard firmware of the ASRock
Q1900DC-ITX, version 1.20, does not improve the situation.

( Searching the web seems to suggest that other Bay Trail-D mainboards
  might be affected as well. )
Signed-off-by: Stefan Lippers-Hollmann <>
Cc: <>
Cc: Matt Fleming <>
Signed-off-by: Ingo Molnar <>
 arch/x86/kernel/reboot.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index bae6c60..86db4bc 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -183,6 +183,16 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
+	/* ASRock */
+	{	/* Handle problems with rebooting on ASRock Q1900DC-ITX */
+		.callback = set_pci_reboot,
+		.ident = "ASRock Q1900DC-ITX",
+		.matches = {
+		},
+	},
 	/* ASUS */
 	{	/* Handle problems with rebooting on ASUS P4S800 */
 		.callback = set_bios_reboot,

      parent reply	other threads:[~2015-04-02 12:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-30 20:44 [PATCH] x86: add " Stefan Lippers-Hollmann
2015-03-31  6:31 ` Ingo Molnar
2015-03-31 18:58   ` Stefan Lippers-Hollmann
2015-04-02 12:28 ` tip-bot for Stefan Lippers-Hollmann [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [tip:x86/urgent] x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).