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andy90

Member

From: Frankfurt

Registered: 2016-06-24

Posts: 6

Dell XPS 13 (9350): erratic keyboard behaviour when charging via USB-C

For a long time I have used the proprietary Dell charger for charging my Dell XPS 13 (9350) laptop. Recently I obtained a USB-C charger from Lenovo. Charging the XPS 13 works, but the system becomes unusable. Everything is fine excpet for one thing: after plugging in the charger, keyboard input is slightly delayed and many key presses are skipped. You can only type really, really slowly and you have to check after every key press that the character is really detected. As I said, everything else seems to be fine, using the mouse, the system is responsive. Any ideas what to do or how to debug?

 $ uname -a
Linux gauss 5.8.13-arch1-1 #1 SMP PREEMPT Thu, 01 Oct 2020 20:40:35 +0000 x86_64 GNU/Linux

Latest BIOS version is installed.

$ fwupdmgr get-devices
XPS 13 9350
│
├─System Firmware:
│     Device ID:          79f2996ff11608674c5d2e8db20e10e0b646f2cb
│     Current version:    1.12.2
│     Minimum Version:    1.12.2
│     Vendor:             Dell Inc. (DMI:Dell Inc.)
│     GUID:               33773727-8ee7-4d81-9fa0-57e8d889e1fa
│     Device Flags:       • Internal device
│                         • Updatable
│                         • Requires AC power
│                         • Supported on remote server
│                         • Needs a reboot after installation
│                         • Cryptographic hash verification is available
│                         • Device is usable for the duration of the update

This error message appears when I unplug the USB-C charger.

$ dmesg
[...]
[ 2137.108274] ACPI Error: Cannot release Mutex [PATM], not acquired (20200528/exmutex-357)
[ 2137.108297] ACPI Error: Aborting method \_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_AML_MUTEX_NOT_ACQUIRED) (20200528/psparse-529)

Plugging and unplugging the charger as seen from journalctl.

$ journalctl -b
[...]
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil:
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: Can't contact ck
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: Currently using activity  "6ea3d04a-84f3-477a-8947-4ec086342cb5"
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: ("6ea3d04a-84f3-477a-8947-4ec086342cb5") ()
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: () ("mode")
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: Loading profile for plugged AC
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: Activity is not forcing a profile
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil:
Okt 03 12:01:28 gauss org_kde_powerdevil[896]: powerdevil: Loading timeouts with  300000
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil:
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: Can't contact ck
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: Currently using activity  "6ea3d04a-84f3-477a-8947-4ec086342cb5"
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: ("6ea3d04a-84f3-477a-8947-4ec086342cb5") ()
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: () ("mode")
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: Loading profile for unplugged AC
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: Activity is not forcing a profile
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil:
Okt 03 12:01:41 gauss org_kde_powerdevil[896]: powerdevil: Loading timeouts with  180000
Okt 03 12:01:41 gauss kernel: ACPI Error: Cannot release Mutex [PATM], not acquired (20200528/exmutex-357)
Okt 03 12:01:41 gauss kernel: ACPI Error: Aborting method \_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_AML_MUTEX_NOT_ACQUIRED) (20200528/psparse-529)

Last edited by andy90 (2020-10-03 10:24:16)

andy90

Member

From: Frankfurt

Registered: 2016-06-24

Posts: 6

Re: Dell XPS 13 (9350): erratic keyboard behaviour when charging via USB-C

I never found the cause of the above problem. The problem disappeared when I got a new USB-C charger.