mbox series

[SRU,B/C/D/Unstable/OEM-B/OEM-OSP1-B,0/1] Fix disappearing Qualcomm WiFi/Bluetooth

Message ID 20190610072141.29940-1-kai.heng.feng@canonical.com
Headers show
Series Fix disappearing Qualcomm WiFi/Bluetooth | expand

Message

Kai-Heng Feng June 10, 2019, 7:21 a.m. UTC 
BugLink: https://bugs.launchpad.net/bugs/1757218

[Impact]
Qualcomm WiFi/Bluetooth may disappear after boot.

[Fix]
Disable USB2 LPM at shutdown phase, to prevent it from lingering in LPM
L1. Pull back the device to full power before shutdown imitates the
behavior on Windows.

[Test]
The affected user confimed it fixes the issue.
I can also confirm that
a) The power drain in S5 is much lower,
b) Both WiFi and Bluetooth are always present during reboot stress test.

[Regression Potential]
Low. Only a limited number of USB2 devices that support LPM.

Kai-Heng Feng (1):
  UBUNTU: SAUCE: USB: Disable USB2 LPM at shutdown

 drivers/usb/core/port.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Timo Aaltonen June 12, 2019, 10 a.m. UTC | #1 
On 10.6.2019 10.21, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1757218
> 
> [Impact]
> Qualcomm WiFi/Bluetooth may disappear after boot.
> 
> [Fix]
> Disable USB2 LPM at shutdown phase, to prevent it from lingering in LPM
> L1. Pull back the device to full power before shutdown imitates the
> behavior on Windows.
> 
> [Test]
> The affected user confimed it fixes the issue.
> I can also confirm that
> a) The power drain in S5 is much lower,
> b) Both WiFi and Bluetooth are always present during reboot stress test.
> 
> [Regression Potential]
> Low. Only a limited number of USB2 devices that support LPM.
> 
> Kai-Heng Feng (1):
>   UBUNTU: SAUCE: USB: Disable USB2 LPM at shutdown
> 
>  drivers/usb/core/port.c | 9 +++++++++
>  1 file changed, 9 insertions(+)

applied to osp1 oem-next, thanks
Kleber Sacilotto de Souza July 2, 2019, 9:07 a.m. UTC | #2 
On 6/10/19 9:21 AM, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1757218
> 
> [Impact]
> Qualcomm WiFi/Bluetooth may disappear after boot.
> 
> [Fix]
> Disable USB2 LPM at shutdown phase, to prevent it from lingering in LPM
> L1. Pull back the device to full power before shutdown imitates the
> behavior on Windows.
> 
> [Test]
> The affected user confimed it fixes the issue.
> I can also confirm that
> a) The power drain in S5 is much lower,
> b) Both WiFi and Bluetooth are always present during reboot stress test.
> 
> [Regression Potential]
> Low. Only a limited number of USB2 devices that support LPM.
> 
> Kai-Heng Feng (1):
>   UBUNTU: SAUCE: USB: Disable USB2 LPM at shutdown
> 
>  drivers/usb/core/port.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 

Applied to {bionic,cosmic,disco}/master-next branch.

Thanks,
Kleber