[Bug 111180] linux-5.1.19: i915 when ext HDMI is connected triggers too many interrupts and high load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111180

--- Comment #9 from mmokrejs at fold.natur.cuni.cz <mmokrejs at gmail.com> ---
Created attachment 144854
  --> https://bugs.freedesktop.org/attachment.cgi?id=144854&action=edit
dmesg-5.3.0-rc1-drm-tip.txt

The CPU fan runs at lower speed although still is not ideal. It can be turned
off completely (actually get turned off if I unplug the HDMI cable). I still
see the errors in the dmesg output so I am not surprised the system is bothered
by interrupts to some extent. But it is definitely better than 5.1.19 and the
other kernels I tried.

What I tested now is:

# git log | head
commit efc5709a1e0f5050b197b51c3fce4cbcc95fe319
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Jul 23 11:11:03 2019 +0200

    drm-tip: 2019y-07m-23d-09h-10m-12s UTC integration manifest



# cat /proc/interrupts 
           CPU0       CPU1       
  0:          6          0  IR-IO-APIC   2-edge      timer
  1:         17          0  IR-IO-APIC   1-edge      i8042
  8:          0          1  IR-IO-APIC   8-edge      rtc0
  9:          0          4  IR-IO-APIC   9-fasteoi   acpi
 12:          0          0  IR-IO-APIC  12-edge      i8042
 16:         82          0  IR-IO-APIC  16-fasteoi   ehci_hcd:usb1
 18:          0          0  IR-IO-APIC  18-fasteoi   i801_smbus
 23:          0         64  IR-IO-APIC  23-fasteoi   ehci_hcd:usb2
 24:          0          0  DMAR-MSI   0-edge      dmar0
 25:          0          0  DMAR-MSI   1-edge      dmar1
 30:          0          0  IR-PCI-MSI 473088-edge      pciehp
 31:          0     229235  IR-PCI-MSI 32768-edge      i915
 32:          0          0  IR-PCI-MSI 360448-edge      mei_me
 33:          0      20477  IR-PCI-MSI 512000-edge      ahci[0000:00:1f.2]
 34:        842          0  IR-PCI-MSI 2621440-edge      p1p1
 35:          0       5606  IR-PCI-MSI 5767168-edge      xhci_hcd
 36:          0          0  IR-PCI-MSI 5767169-edge      xhci_hcd
 37:          0          0  IR-PCI-MSI 5767170-edge      xhci_hcd
 38:          0          0  IR-PCI-MSI 5767171-edge      xhci_hcd
 39:          0          0  IR-PCI-MSI 5767172-edge      xhci_hcd
 40:          0          0  IR-PCI-MSI 442368-edge      snd_hda_intel:card0
 41:          0          1  IR-PCI-MSI 4718592-edge      iwlwifi
NMI:          0          0   Non-maskable interrupts
LOC:     133679      48455   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:          0          0   Performance monitoring interrupts
IWI:          1        349   IRQ work interrupts
RTR:          0          0   APIC ICR read retries
RES:      46357      32603   Rescheduling interrupts
CAL:      18434       7871   Function call interrupts
TLB:      17100      17878   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:          2          3   Machine check polls
ERR:          0
MIS:          0
PIN:          0          0   Posted-interrupt notification event
NPI:          0          0   Nested posted-interrupt event
PIW:          0          0   Posted-interrupt wakeup event
# w
 14:37:53 up 8 min,  2 users,  load average: 0.44, 0.62, 0.37
...

# lspci -vvv -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
        Subsystem: Dell 2nd Generation Core Processor Family Integrated
Graphics 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 31
        Region 0: Memory at f6800000 (64-bit, non-prefetchable) [size=4M]
        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: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee00018  Data: 0000
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915

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