[Bug 209020] x11-servers/xorg-server Intel video hardware acceleration causes cpu overheating

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209020

            Bug ID: 209020
           Summary: x11-servers/xorg-server Intel video hardware
                    acceleration causes cpu overheating
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: tony at accesslab.com
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

When using either the Intel i915 driver in xf86-video-intel-2.21.15_9 or Intel
modesetting driver built in to xorg-server-1.17.4, running with hardware
acceleration turned, the cpu chip temerature rapidly rises to above 60 deg C on
Lenovo G770 laptop with an Intel i3 2310M cpu and Intel HD video. This occurs
even when minimal video operations are happening, for example simple scrolling
on an Xterm will cause it. Once the temperature starts rising, it will stay
elevated indefinitely until the X server is exited. The cpu frequency is not
causing it because the temperature remains elevated above 60 deg C even while
the system is idle and the cpu frequency is idling at 800 MHz on a 2.1 GHz cpu.
Also the laptop fan and heatsink assembly is clean of any dust, is open with
full airflow, and operating properly.

When the acceleration is turned off in either driver ( "NoAccel"="true" in the
intel driver and "AccelMethod"="none" in the Xorg modesetting driver ), the
problem goes away. With no acceleration, fast terminal scrolling and/or high
graphics operations will cause the temperature to elevate but quickly goes back
down once the graphics operations become idle. In comparison, with the
acceleration turned on, once the graphics operation triggers a temperature
rise, the temperature rises excessively and remains elevated in a seemingly
runaway condition until the X server is exited.

The excessive temperature runaway condition can damage the laptop and/or
greatly reduce battery charge life.

The work around is to run the Xorg built in modesetting driver with glamor
acceleraton turned off.

===

The laptop cpu/os specs:

FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02 UTC 2016
    root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
VT(vga): resolution 640x480
info: [drm] Initialized drm 1.1.0 20060810
CPU: Intel(R) Core(TM) i3-2310M CPU @ 2.10GHz (2095.29-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x206a7  Family=0x6  Model=0x2a  Stepping=7
 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FX
SR,SSE,SSE2,SS,HTT,TM,PBE>
 
Features2=0x1dbae3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,PO
PCNT,TSCDLT,XSAVE,OSXSAVE,AVX>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
  TSC: P-state invariant, performance statistics
real memory  = 4294967296 (4096 MB)
avail memory = 4043096064 (3855 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <INSYDE HR CRB  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3

===

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