wired problems with 4 screens and 2 graphics boards: ps/2 mouse and kbd 
lock up, machine still running, but not usable.


I have this machine:

 qubes-hcl-report 
Qubes release 4.0 (R4.0)

Brand:        Dell Inc.
Model:        Precision WorkStation T7500  
BIOS:        A17

Xen:        4.8.5-19.fc25
Kernel:        4.19.128-1

RAM:        98301 Mb

CPU:
  Intel(R) Xeon(R) CPU           L5638  @ 2.00GHz
Chipset:
  Intel Corporation 5520 I/O Hub to ESI Port [8086:3406] (rev 22)
VGA:
  Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 7350/8350 / R5 
220] [1002:68fa] (prog-if 00 [VGA controller])
  Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 7350/8350 / R5 
220] [1002:68fa] (prog-if 00 [VGA controller])

Net:
  Intel Corporation 82546EB Gigabit Ethernet Controller (rev 01)
  Intel Corporation 82546EB Gigabit Ethernet Controller (rev 01)
  Intel Corporation 82546EB Gigabit Ethernet Controller (rev 01)
  Intel Corporation 82546EB Gigabit Ethernet Controller (rev 01)
  Broadcom Limited NetXtreme BCM5761 Gigabit Ethernet PCIe (rev 10)

SCSI:
  Samsung SSD 860  Rev: 1B6Q
  DVD+-RW DH-16ABS Rev: PD11

HVM:        Active
I/O MMU:    Active
HAP/SLAT:    Yes
TPM:        Device present
Remapping:    yes

Qubes HCL Files are copied to: 'dom0'
    
Qubes-HCL-Dell_Inc_-Precision_WorkStation_T7500__-20200719-172829.yml    - 
HCL Info

///
lspci
00:00.0 Host bridge: Intel Corporation 5520 I/O Hub to ESI Port (rev 22)
00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express 
Root Port 1 (rev 22)
00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express 
Root Port 3 (rev 22)
00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express 
Root Port 7 (rev 22)
00:14.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub System Management 
Registers (rev 22)
00:14.1 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch 
Pad Registers (rev 22)
00:14.2 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status 
and RAS Registers (rev 22)
00:1a.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #4
00:1a.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #5
00:1a.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #6
00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI 
Controller #2
00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio 
Controller
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express 
Root Port 1
00:1c.5 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express 
Root Port 6
00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #1
00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #2
00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI 
Controller #3
00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI 
Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation 82801JIR (ICH10R) LPC Interface 
Controller
00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI 
Controller
00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller
01:00.0 PCI bridge: Pericom Semiconductor PCI Express to PCI-XPI7C9X130 
PCI-X Bridge (rev 04)
02:00.0 PCI bridge: IBM PCI-X to PCI-X Bridge (rev 02)
03:04.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet 
Controller (rev 01)
03:04.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet 
Controller (rev 01)
03:06.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet 
Controller (rev 01)
03:06.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet 
Controller (rev 01)
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Cedar [Radeon HD 7350/8350 / R5 220]
04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI 
Audio [Radeon HD 5400/6300/7300 Series]
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Cedar [Radeon HD 7350/8350 / R5 220]
05:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI 
Audio [Radeon HD 5400/6300/7300 Series]
06:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E 
PCI-Express Fusion-MPT SAS (rev 08)
07:00.0 Ethernet controller: Broadcom Limited NetXtreme BCM5761 Gigabit 
Ethernet PCIe (rev 10)
08:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22A IEEE-1394a-2000 
Controller (PHY/Link) [iOHCI-Lynx]
20:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express 
Root Port 3 (rev 22)
20:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express 
Root Port 7 (rev 22)
20:09.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI 
Express Root Port 9 (rev 22)
20:14.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub System Management 
Registers (rev 22)
20:14.1 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch 
Pad Registers (rev 22)
20:14.2 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status 
and RAS Registers (rev 22)
3e:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath 
Architecture Generic Non-core Registers (rev 02)
3e:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath 
Architecture System Address Decoder (rev 02)
3e:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
3e:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 
02)
3e:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 
(rev 02)
3e:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 
(rev 02)
3e:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
3e:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 
02)
3e:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Registers (rev 02)
3e:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Target Address Decoder (rev 02)
3e:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller RAS Registers (rev 02)
3e:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Test Registers (rev 02)
3e:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Control (rev 02)
3e:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Address (rev 02)
3e:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Rank (rev 02)
3e:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Thermal Control (rev 02)
3e:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Control (rev 02)
3e:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Address (rev 02)
3e:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Rank (rev 02)
3e:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Thermal Control (rev 02)
3e:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Control (rev 02)
3e:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Address (rev 02)
3e:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Rank (rev 02)
3e:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Thermal Control (rev 02)
3f:00.0 Host bridge: Intel Corporation Xeon 5600 Series QuickPath 
Architecture Generic Non-core Registers (rev 02)
3f:00.1 Host bridge: Intel Corporation Xeon 5600 Series QuickPath 
Architecture System Address Decoder (rev 02)
3f:02.0 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 0 (rev 02)
3f:02.1 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 0 (rev 
02)
3f:02.2 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 0 
(rev 02)
3f:02.3 Host bridge: Intel Corporation Xeon 5600 Series Mirror Port Link 1 
(rev 02)
3f:02.4 Host bridge: Intel Corporation Xeon 5600 Series QPI Link 1 (rev 02)
3f:02.5 Host bridge: Intel Corporation Xeon 5600 Series QPI Physical 1 (rev 
02)
3f:03.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Registers (rev 02)
3f:03.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Target Address Decoder (rev 02)
3f:03.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller RAS Registers (rev 02)
3f:03.4 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Test Registers (rev 02)
3f:04.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Control (rev 02)
3f:04.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Address (rev 02)
3f:04.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Rank (rev 02)
3f:04.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 0 Thermal Control (rev 02)
3f:05.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Control (rev 02)
3f:05.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Address (rev 02)
3f:05.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Rank (rev 02)
3f:05.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 1 Thermal Control (rev 02)
3f:06.0 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Control (rev 02)
3f:06.1 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Address (rev 02)
3f:06.2 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Rank (rev 02)
3f:06.3 Host bridge: Intel Corporation Xeon 5600 Series Integrated Memory 
Controller Channel 2 Thermal Control (rev 02)


//
I use 2 graphics boards with 2x DVI each to drive 4 screens.
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Cedar [Radeon HD 7350/8350 / R5 220]
04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI 
Audio [Radeon HD 5400/6300/7300 Series]
05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Cedar [Radeon HD 7350/8350 / R5 220]
05:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI 
Audio [Radeon HD 5400/6300/7300 Series]

Some times the problem starts with 2 screens from one graphics board 
switching to standby and the mouse can only use
2 screens.
Sometimes I cant click into shell windows to get focus.

The Problem ends with a locked console, so I can see the other processes of 
the guest machines perfectly running,
but can not enter anything or move the mouse.

If I press the power button the dialog for shuting down the machine 
appears, but it does not help, as I cant click.
!!
Feature request: toggle through the power-button induced shutdown menue by 
shortly pressing the power button 
again (catch the event and see if the menue is already active), and select 
the option by pressing the power button shortly
5 times within 4 seconds.
/feature request.

But it would be higher to solve the problem, as it is quite anoying.
How to debug?
It is quite random.

Cheers.

Ludwig



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