* [PATCH v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds
@ 2026-07-06 12:15 Shuai Zhang
2026-07-06 13:11 ` [v1] " bluez.test.bot
2026-07-06 13:21 ` [PATCH v1] " Luiz Augusto von Dentz
0 siblings, 2 replies; 3+ messages in thread
From: Shuai Zhang @ 2026-07-06 12:15 UTC (permalink / raw)
To: Marcel Holtmann, Luiz Augusto von Dentz
Cc: linux-bluetooth, linux-kernel, linux-arm-msm, chejiang,
quic_chezhou, wei.deng, jinwang.li, mengshi.wu, Shuai Zhang
HCI_AUTO_OFF_TIMEOUT controls how long the kernel waits after an
adapter completes its initial setup before automatically powering
it off, in case userspace (bluetoothd) has not yet issued
MGMT_OP_SET_POWERED. This avoids leaving the controller powered
while unused.
On platforms where other services are ordered ahead of it, the
actual time at which bluetooth.service starts and issues
SET_POWERED can be delayed past this 2 second window. For example,
cloud-init-local.service can perform a network metadata probe
during early boot, delaying bluetooth.service startup by several
seconds:
$ systemd-analyze critical-chain bluetooth.service
bluetooth.service +594ms
`-basic.target @9.342s
`-sockets.target @9.335s
`-snapd.socket @9.267s +58ms
`-sysinit.target @9.025s
`-cloud-init.service @8.377s +604ms
`-cloud-init-local.service @7.000s +1.340s
`-systemd-remount-fs.service @3.257s +44ms
`-systemd-fsck-root.service @2.803s +394ms
`-systemd-journald.socket @2.223s
`-system.slice @1.772s
`--.slice @1.772s
Once the 2 second window is exceeded, HCI_AUTO_OFF fires before
SET_POWERED is received, powering off the controller and losing
its firmware state. The SET_POWERED that bluetoothd eventually
sends then has to reopen the device, triggering an otherwise
avoidable repeat setup and firmware re-download, adding several
more seconds of delay.
Increase the timeout from 2 to 10 seconds to give userspace on
systems with slower service ordering a more realistic window to
take over, avoiding this unnecessary repeat setup, while still
bounding how long an unclaimed controller stays powered on.
Signed-off-by: Shuai Zhang <shuai.zhang@oss.qualcomm.com>
---
include/net/bluetooth/hci.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 50f0eef71..ee3f295f9 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -483,7 +483,7 @@ enum {
#define HCI_CMD_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */
#define HCI_NCMD_TIMEOUT msecs_to_jiffies(4000) /* 4 seconds */
#define HCI_ACL_TX_TIMEOUT msecs_to_jiffies(45000) /* 45 seconds */
-#define HCI_AUTO_OFF_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */
+#define HCI_AUTO_OFF_TIMEOUT msecs_to_jiffies(10000) /* 10 seconds */
#define HCI_ACL_CONN_TIMEOUT msecs_to_jiffies(20000) /* 20 seconds */
#define HCI_LE_CONN_TIMEOUT msecs_to_jiffies(20000) /* 20 seconds */
#define HCI_ISO_TX_TIMEOUT usecs_to_jiffies(0x7fffff) /* 8388607 usecs */
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* RE: [v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds
2026-07-06 12:15 [PATCH v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds Shuai Zhang
@ 2026-07-06 13:11 ` bluez.test.bot
2026-07-06 13:21 ` [PATCH v1] " Luiz Augusto von Dentz
1 sibling, 0 replies; 3+ messages in thread
From: bluez.test.bot @ 2026-07-06 13:11 UTC (permalink / raw)
To: linux-bluetooth, shuai.zhang
[-- Attachment #1: Type: text/plain, Size: 2389 bytes --]
This is automated email and please do not reply to this email!
Dear submitter,
Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=1122329
---Test result---
Test Summary:
CheckPatch PASS 0.59 seconds
VerifyFixes PASS 0.07 seconds
VerifySignedoff PASS 0.10 seconds
GitLint PASS 0.21 seconds
SubjectPrefix PASS 0.06 seconds
BuildKernel PASS 28.22 seconds
CheckAllWarning PASS 31.62 seconds
CheckSparse PASS 29.52 seconds
BuildKernel32 PASS 27.54 seconds
CheckKernelLLVM SKIP 0.00 seconds
TestRunnerSetup PASS 514.33 seconds
TestRunner_l2cap-tester PASS 64.26 seconds
TestRunner_iso-tester PASS 98.47 seconds
TestRunner_bnep-tester PASS 20.43 seconds
TestRunner_mgmt-tester FAIL 229.99 seconds
TestRunner_rfcomm-tester PASS 28.67 seconds
TestRunner_sco-tester PASS 34.43 seconds
TestRunner_ioctl-tester PASS 28.20 seconds
TestRunner_mesh-tester FAIL 27.34 seconds
TestRunner_smp-tester PASS 24.92 seconds
TestRunner_userchan-tester PASS 21.42 seconds
TestRunner_6lowpan-tester PASS 25.81 seconds
IncrementalBuild PASS 28.01 seconds
Details
##############################
Test: CheckKernelLLVM - SKIP
Desc: Build kernel with LLVM + context analysis
Output:
Clang not found
##############################
Test: TestRunner_mgmt-tester - FAIL
Desc: Run mgmt-tester with test-runner
Output:
Total: 494, Passed: 489 (99.0%), Failed: 1, Not Run: 4
Failed Test Cases
Read Exp Feature - Success Failed 0.277 seconds
##############################
Test: TestRunner_mesh-tester - FAIL
Desc: Run mesh-tester with test-runner
Output:
Total: 10, Passed: 8 (80.0%), Failed: 2, Not Run: 0
Failed Test Cases
Mesh - Send cancel - 1 Timed out 2.442 seconds
Mesh - Send cancel - 2 Timed out 1.981 seconds
https://github.com/bluez/bluetooth-next/pull/404
---
Regards,
Linux Bluetooth
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds
2026-07-06 12:15 [PATCH v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds Shuai Zhang
2026-07-06 13:11 ` [v1] " bluez.test.bot
@ 2026-07-06 13:21 ` Luiz Augusto von Dentz
1 sibling, 0 replies; 3+ messages in thread
From: Luiz Augusto von Dentz @ 2026-07-06 13:21 UTC (permalink / raw)
To: Shuai Zhang
Cc: Marcel Holtmann, linux-bluetooth, linux-kernel, linux-arm-msm,
chejiang, quic_chezhou, wei.deng, jinwang.li, mengshi.wu
Hi Shuai,
On Mon, Jul 6, 2026 at 8:15 AM Shuai Zhang <shuai.zhang@oss.qualcomm.com> wrote:
>
> HCI_AUTO_OFF_TIMEOUT controls how long the kernel waits after an
> adapter completes its initial setup before automatically powering
> it off, in case userspace (bluetoothd) has not yet issued
> MGMT_OP_SET_POWERED. This avoids leaving the controller powered
> while unused.
>
> On platforms where other services are ordered ahead of it, the
> actual time at which bluetooth.service starts and issues
> SET_POWERED can be delayed past this 2 second window. For example,
> cloud-init-local.service can perform a network metadata probe
> during early boot, delaying bluetooth.service startup by several
> seconds:
>
> $ systemd-analyze critical-chain bluetooth.service
> bluetooth.service +594ms
> `-basic.target @9.342s
> `-sockets.target @9.335s
> `-snapd.socket @9.267s +58ms
> `-sysinit.target @9.025s
> `-cloud-init.service @8.377s +604ms
> `-cloud-init-local.service @7.000s +1.340s
> `-systemd-remount-fs.service @3.257s +44ms
> `-systemd-fsck-root.service @2.803s +394ms
> `-systemd-journald.socket @2.223s
> `-system.slice @1.772s
> `--.slice @1.772s
>
> Once the 2 second window is exceeded, HCI_AUTO_OFF fires before
> SET_POWERED is received, powering off the controller and losing
> its firmware state. The SET_POWERED that bluetoothd eventually
> sends then has to reopen the device, triggering an otherwise
> avoidable repeat setup and firmware re-download, adding several
> more seconds of delay.
>
> Increase the timeout from 2 to 10 seconds to give userspace on
> systems with slower service ordering a more realistic window to
> take over, avoiding this unnecessary repeat setup, while still
> bounding how long an unclaimed controller stays powered on.
Ok, but we have no idea if the system has Bluetooth enabled. Making it
a 10 seconds timeout might leave Bluetooth powered unnecessarily.
> Signed-off-by: Shuai Zhang <shuai.zhang@oss.qualcomm.com>
> ---
> include/net/bluetooth/hci.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> index 50f0eef71..ee3f295f9 100644
> --- a/include/net/bluetooth/hci.h
> +++ b/include/net/bluetooth/hci.h
> @@ -483,7 +483,7 @@ enum {
> #define HCI_CMD_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */
> #define HCI_NCMD_TIMEOUT msecs_to_jiffies(4000) /* 4 seconds */
> #define HCI_ACL_TX_TIMEOUT msecs_to_jiffies(45000) /* 45 seconds */
> -#define HCI_AUTO_OFF_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */
> +#define HCI_AUTO_OFF_TIMEOUT msecs_to_jiffies(10000) /* 10 seconds */
> #define HCI_ACL_CONN_TIMEOUT msecs_to_jiffies(20000) /* 20 seconds */
> #define HCI_LE_CONN_TIMEOUT msecs_to_jiffies(20000) /* 20 seconds */
> #define HCI_ISO_TX_TIMEOUT usecs_to_jiffies(0x7fffff) /* 8388607 usecs */
> --
> 2.34.1
>
--
Luiz Augusto von Dentz
^ permalink raw reply [flat|nested] 3+ messages in thread
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2026-07-06 12:15 [PATCH v1] Bluetooth: Increase HCI_AUTO_OFF_TIMEOUT to 10 seconds Shuai Zhang
2026-07-06 13:11 ` [v1] " bluez.test.bot
2026-07-06 13:21 ` [PATCH v1] " Luiz Augusto von Dentz
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