> Date: Fri, 10 Jul 2020 17:47:21 +0300 (EEST)
> From: [email protected]
> 
> >Synopsis:    Default X configuration with Firefox temporarily locks up x250 
> >with Firefox
> >Category:    kernel
> >Environment:
>       System      : OpenBSD 6.7
>       Details     : OpenBSD 6.7-current (GENERIC.MP) #337: Wed Jul  8 
> 10:37:10 MDT 2020
>                        
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> 
>       Architecture: OpenBSD.amd64
>       Machine     : amd64
> >Description:
>       Ever since the DRM update the CPU will randomly go to (more than) 100%
>       and lock-up the machine for 20-30 seconds to a few minutes. This is
>       triggered faster when using Firefox (or other rendering programs).
> >How-To-Repeat:
>       Install -current on an x250 laptop and run Firefox on non-trivial
>       websites. Example: web.whatsapp.com, drive.google.com, docs.google.com,
>       dropbox.com, outlook.office365.com etc.
> >Fix:
>       $ cat /etc/X11/xorg.conf
>       Section "Device"
>         Identifier "default device"
>         Driver "modesetting"
>         Option "AccelMethod" "none"
>       EndSection
> 
> 
> 
> dmesg:
> OpenBSD 6.7-current (GENERIC.MP) #337: Wed Jul  8 10:37:10 MDT 2020
>     [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 3959955456 (3776MB)
> avail mem = 3824910336 (3647MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xccbfc000 (65 entries)
> bios0: vendor LENOVO version "N10ET36W (1.15 )" date 06/19/2015
> bios0: LENOVO 20CLS7AH00
> acpi0 at bios0: ACPI 5.0
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP ASF! HPET ECDT APIC MCFG SSDT SSDT SSDT SSDT SSDT 
> SSDT SSDT SSDT SSDT PCCT SSDT UEFI MSDM BATB FPDT SSDT SSDT TPM2 UEFI DMAR
> acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) EHC1(S3)
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpihpet0 at acpi0: 14318179 Hz
> acpiec0 at acpi0
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2095.48 MHz, 06-3d-04
> cpu0: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu0: 256KB 64b/line 8-way L2 cache
> cpu0: TSC skew=0 observed drift=0
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
> cpu0: apic clock running at 99MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
> cpu1 at mainbus0: apid 1 (application processor)
> cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2095.16 MHz, 06-3d-04
> cpu1: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu1: 256KB 64b/line 8-way L2 cache
> cpu1: TSC skew=2 observed drift=0
> cpu1: smt 1, core 0, package 0
> cpu2 at mainbus0: apid 2 (application processor)
> cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2095.16 MHz, 06-3d-04
> cpu2: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu2: 256KB 64b/line 8-way L2 cache
> cpu2: TSC skew=8 observed drift=0
> cpu2: smt 0, core 1, package 0
> cpu3 at mainbus0: apid 3 (application processor)
> cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2095.16 MHz, 06-3d-04
> cpu3: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu3: 256KB 64b/line 8-way L2 cache
> cpu3: TSC skew=4 observed drift=0
> cpu3: smt 1, core 1, package 0
> ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
> acpimcfg0 at acpi0
> acpimcfg0: addr 0xf8000000, bus 0-63
> acpiprt0 at acpi0: bus 0 (PCI0)
> acpiprt1 at acpi0: bus -1 (PEG_)
> acpiprt2 at acpi0: bus 2 (EXP1)
> acpiprt3 at acpi0: bus 3 (EXP2)
> acpiprt4 at acpi0: bus -1 (EXP3)
> acpicpu0 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu1 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu2 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu3 at acpi0: C3(200@233 mwait.1@0x40), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpipwrres0 at acpi0: PUBS, resource for XHCI, EHC1
> acpipwrres1 at acpi0: NVP3, resource for PEG_
> acpipwrres2 at acpi0: NVP2, resource for PEG_
> acpitz0 at acpi0: critical temperature is 128 degC
> acpibtn0 at acpi0: LID_
> acpibtn1 at acpi0: SLPB
> acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
> extent `acpipci0 pcibus' (0x0 - 0xff), flags=0
>      0x40 - 0xff
> extent `acpipci0 pciio' (0x0 - 0xffffffff), flags=0
>      0xcf8 - 0xcff
>      0x10000 - 0xffffffff
> extent `acpipci0 pcimem' (0x0 - 0xffffffffffffffff), flags=0
>      0x0 - 0x9ffff
>      0xc0000 - 0xcfffffff
>      0xfec00000 - 0xfed3ffff
>      0xfed4c000 - 0xffffffffffffffff
> acpicmos0 at acpi0
> acpibat0 at acpi0: BAT0 model "45N1773" serial  2340 type LION oem "SANYO"
> acpibat1 at acpi0: BAT1 model "45N1127" serial  7001 type LION oem "LGC"
> acpiac0 at acpi0: AC unit online
> acpithinkpad0 at acpi0: version 1.0
> "PNP0C14" at acpi0 not configured
> "PNP0C14" at acpi0 not configured
> "PNP0C14" at acpi0 not configured
> "INT340F" at acpi0 not configured
> "MSFT0101" at acpi0 not configured
> acpivideo0 at acpi0: VID_
> acpivout0 at acpivideo0: LCD0
> acpivideo1 at acpi0: VID_
> cpu0: using VERW MDS workaround (except on vmm entry)
> cpu0: Enhanced SpeedStep 2095 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 
> 1700, 1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz
> pci0 at mainbus0 bus 0
> pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
> inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09
> drm0 at inteldrm0
> inteldrm0: msi, BROADWELL, gen 8

FWIW, I have an x1 gen3 wich is essentially the same hardware.  I see
no such issues, but I mostly run chrome and I do have 8G of memory.

To me this sounds like you are running out of memory.  The DRM code is
supposed to give up any spare graphics buffers when asked to do so by
the pagedeamon.  But maybe that isn't working well for you.

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