[Bug 89518] *ERROR* PCH transcoder A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89518

ralf_h <ralfhdepot-bugs at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ralfhdepot-bugs at yahoo.com
           Hardware|Other                       |x86-64 (AMD64)
                 OS|All                         |Linux (All)

--- Comment #1 from ralf_h <ralfhdepot-bugs at yahoo.com> ---
Got the same issue. The error doesn't seem to have any effect on my system
though. Nor blackscreens, freezes or whatsoever. 

guybrush at marvin:~$ dmesg | grep drm
[    6.736826] [drm] Initialized drm 1.1.0 20060810
[    6.757697] [drm] Memory usable by graphics device = 2048M
[    6.757702] [drm] Replacing VGA console driver
[    6.779958] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    6.779959] [drm] Driver supports precise vblank timestamp query.
[    6.825395] fbcon: inteldrmfb (fb0) is primary device
[    7.155162] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo
underrun on pch transcoder A
[    7.155164] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun
[    7.579342] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    7.701660] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor
0
[    7.815871] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off

About my system:

guybrush at marvin:~$ uname -rvmo
3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3~deb8u1 (2015-04-24) x86_64 GNU/
Linux

root at marvin:/home/guybrush# lspci -vv | grep -A19 '00:02.0'
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processo
r Graphics Controller (rev 09) (prog-if 00 [VGA controller])
    Subsystem: CLEVO/KAPOK Computer Device 2400
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr
- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TA
bort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 44
    Region 0: Memory at f7800000 (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]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Address: fee0300c  Data: 41c1
    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

guybrush at marvin:~$ cat /proc/cpuinfo 
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 58
model name    : Intel(R) Celeron(R) CPU 1037U @ 1.80GHz
stepping    : 9
microcode    : 0x1b
cpu MHz        : 799.945
cache size    : 2048 KB
physical id    : 0
siblings    : 2
core id        : 0
cpu cores    : 2
apicid        : 0
initial apicid    : 0
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave lahf_lm
arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase
smep erms
bogomips    : 3591.54
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

processor    : 1
vendor_id    : GenuineIntel
cpu family    : 6
model        : 58
model name    : Intel(R) Celeron(R) CPU 1037U @ 1.80GHz
stepping    : 9
microcode    : 0x1b
cpu MHz        : 918.210
cache size    : 2048 KB
physical id    : 0
siblings    : 2
core id        : 1
cpu cores    : 2
apicid        : 2
initial apicid    : 2
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave lahf_lm
arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase
smep erms
bogomips    : 3591.54
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

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