External Dell P2715Q doesn't wake up from standby anymore after 18.04 -> 18.10 upgrade

[Cedric M]

Hi,

Since upgrading to 18.10, my Dell P2715Q external screen (connected to a Dell XPS 13 9343 laptop) fails to wakeup after a period of inactivity:

- leave the laptop idle for a while, gnome screen lock will take over and shut down the internal panel & external screen (it enters power saving mode). Same behaviour as 18.04.

- however, if I come back after an hour or so and move the mouse or press a key, only the internal panel wakes up. The external screen remains blank (Xorg probably think that the external screen is on as the password prompt of gnome screen lock will not be visible on the internal panel, it's probably displayed on the blank surface -- I have to enter my password blind to get back to the desktop).

Running xrandr without any argument sometimes helps getting the external screen to turn on.
When it does not, I have to turn the screen OFF and ON again.

I haven't seen any error message in dmesg or Xorg.0.log.

$ uname -a
Linux Aurora 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:13:55 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ lspci -vv
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
 Subsystem: Dell Broadwell-U Host Bridge -OPI
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Capabilities: <access denied>
 Kernel driver in use: bdw_uncore

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller])
 Subsystem: Dell HD Graphics 5500
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 47
 Region 0: Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
 Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at f000 [size=64]
 [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: <access denied>
 Kernel driver in use: i915
 Kernel modules: i915

00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
 Subsystem: Dell Broadwell-U Audio Controller
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 49
 Region 0: Memory at f721c000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: snd_hda_intel
 Kernel modules: snd_hda_intel

00:04.0 Signal processing controller: Intel Corporation Broadwell-U Processor Thermal Subsystem (rev 09)
 Subsystem: Dell Broadwell-U Processor Thermal Subsystem
 Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Interrupt: pin A routed to IRQ 16
 Region 0: Memory at f7210000 (64-bit, non-prefetchable) [size=32K]
 Capabilities: <access denied>
 Kernel driver in use: proc_thermal
 Kernel modules: processor_thermal_device

00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03) (prog-if 30 [XHCI])
 Subsystem: Dell Wildcat Point-LP USB xHCI Controller
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 44
 Region 0: Memory at f7200000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: xhci_hcd

00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
 Subsystem: Dell Wildcat Point-LP MEI Controller
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+
 Latency: 0
 Interrupt: pin A routed to IRQ 255
 Region 0: Memory at f7226000 (64-bit, non-prefetchable) [size=32]
 Capabilities: <access denied>
 Kernel modules: mei_me

00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
 Subsystem: Dell Wildcat Point-LP High Definition Audio Controller
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 32, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 50
 Region 0: Memory at f7218000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: snd_hda_intel
 Kernel modules: snd_hda_intel

00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 42
 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
 Memory behind bridge: f7100000-f71fffff
 Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
 BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
  PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
 Capabilities: <access denied>
 Kernel driver in use: pcieport

00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin D routed to IRQ 43
 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
 Memory behind bridge: f7000000-f70fffff
 Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
 BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
  PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
 Capabilities: <access denied>
 Kernel driver in use: pcieport

00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03) (prog-if 20 [EHCI])
 Subsystem: Dell Wildcat Point-LP USB EHCI Controller
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 21
 Region 0: Memory at f7223000 (32-bit, non-prefetchable) [size=1K]
 Capabilities: <access denied>
 Kernel driver in use: ehci-pci

00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
 Subsystem: Dell Wildcat Point-LP LPC Controller
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Capabilities: <access denied>
 Kernel driver in use: lpc_ich
 Kernel modules: lpc_ich

00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03) (prog-if 01 [AHCI 1.0])
 Subsystem: Dell Wildcat Point-LP SATA Controller [AHCI Mode]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin B routed to IRQ 46
 Region 0: I/O ports at f0b0 [size=8]
 Region 1: I/O ports at f0a0 [size=4]
 Region 2: I/O ports at f090 [size=8]
 Region 3: I/O ports at f080 [size=4]
 Region 4: I/O ports at f060 [size=32]
 Region 5: Memory at f7222000 (32-bit, non-prefetchable) [size=2K]
 Capabilities: <access denied>
 Kernel driver in use: ahci
 Kernel modules: ahci

00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
 Subsystem: Dell Wildcat Point-LP SMBus Controller
 Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Interrupt: pin C routed to IRQ 255
 Region 0: Memory at f7221000 (64-bit, non-prefetchable) [size=256]
 Region 4: I/O ports at f040 [size=32]
 Kernel modules: i2c_i801

00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
 Subsystem: Dell Wildcat Point-LP Thermal Management Controller
 Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Interrupt: pin C routed to IRQ 18
 Region 0: Memory at f7220000 (64-bit, non-prefetchable) [size=4K]
 Capabilities: <access denied>
 Kernel driver in use: intel_pch_thermal
 Kernel modules: intel_pch_thermal

01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI Express Card Reader (rev 01)
 Subsystem: Realtek Semiconductor Co., Ltd. RTS5249 PCI Express Card Reader
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 45
 Region 0: Memory at f7100000 (32-bit, non-prefetchable) [size=4K]
 Capabilities: <access denied>
 Kernel driver in use: rtsx_pci
 Kernel modules: rtsx_pci

02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
 Subsystem: Intel Corporation Dual Band Wireless-AC 7265
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 48
 Region 0: Memory at f7000000 (64-bit, non-prefetchable) [size=8K]
 Capabilities: <access denied>
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

Thanks,
Cedric

[Cedric M (cedric-m)]

Just got the external screen in the same state again (ie, blank) after leaving the desk for 5-10 minutes.

While in that state, the external screens tells that it doesn't receive any signal.
Switching it's input from it's usual DP input to another one, and switching back again does restore the image.

[Daniel van Vugt (vanvugt)]

Please run this command to send us more information about the system:

  apport-collect 1799920

[Cedric M (cedric-m)]

Hi,

For some reason apport-collect just exit at the end, and doesn't send anything to launchpad...
No error, no crash -- just exit to shell when being instructed to send the report.

$ apport-collect -p xserver-xorg-core 1799920
The authorization page:
 (https://launchpad.net/+authorize-token?oauth_token=<REDACTED>&allow_permission=DESKTOP_INTEGRATION)
should be opening in your browser. Use your browser to authorize
this program to access Launchpad on your behalf.
Waiting to hear from Launchpad about your decision...
$

(access granted to launchpad, answer the few questions asked, click send... and it just exit).

Is there anything special I can provide manually?

The bug I encounter might be related to https://bugs.freedesktop.org/show_bug.cgi?id=107446

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 18.10 (cosmic) reached end-of-life on July 18, 2019.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.

[Cedric M (cedric-m)]

Hi,

I have switched from Gnome to i3, this fixed the issue for me.

The underlying issue might have been fixed by https://cgit.freedesktop.org/drm-tip/commit/?id=3cf71bc9904d7ee4a25a822c5dcb54c7804ea388, but I didn't check.