dp blanks randomly with errors

[Alex Deucher]

On Tue, Dec 16, 2014 at 4:38 PM, Christopher Barry
<christopher.barry at earborg.com> wrote:
> On Tue, 16 Dec 2014 10:49:50 -0500
> Alex Deucher <alexdeucher at gmail.com> wrote:
>
>>On Sun, Dec 14, 2014 at 6:45 PM, Christopher Barry
>><christopher.barry at earborg.com> wrote:
>>>
>>> Getting these errors in syslog
>>>
>>> [drm:radeon_dp_link_train_ce] *ERROR* displayport link status failed
>>> [drm:radeon_dp_link_train_ce] *ERROR* channel eq failed
>>>
>>> also, there have been a lot of 'clock recovery failed' errors as
>>> well.
>>>
>>> running debian sid, and I upgrade about every 5 days or so, so my box
>>> is quite up to date for a packaged distro. I upgraded this afternoon
>>> EST and behavior is still bad.
>>>
>>> debian packaged kernel 2.14.2
>>>
>>> X.Org X Server 1.16.2.901 (1.16.3 RC 1)
>>> Release Date: 2014-12-09
>>> X Protocol Version 11, Revision 0
>>> Build Operating System: Linux 3.2.0-4-amd64 x86_64 Debian
>>> Current Operating System: Linux monolith 3.12-1-amd64 #1 SMP Debian
>>> 3.12.9-1 (2014-02-01) x86_64
>>> Kernel command line: BOOT_IMAGE=/vmlinuz-3.12-1-amd64
>>> root=/dev/mapper/system_vg-os_lv ro quiet
>>> Build Date: 09 December 2014  10:15:28PM
>>> xorg-server 2:1.16.2.901-1 (http://www.debian.org/support)
>>> Current version of pixman: 0.32.6
>>>         Before reporting problems, check http://wiki.x.org
>>>         to make sure that you have the latest version.
>>>
>>>
>>> lspci -vv for video card:
>>>
>>> 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
>>> [AMD/ATI] Pitcairn PRO [Radeon HD 7850] (prog-if 00 [VGA controller])
>>> Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 7850
>>> 2GB GDDR5 DVI-I/DVI-D/HDMI/DP 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, Cache
>>> >Line Size: 256 bytes
>>> Interrupt: pin A routed to IRQ 56 Region 0: Memory at d0000000
>>> (64-bit, prefetchable) [size=256M] Region 2: Memory at fb9c0000
>>> (64-bit, non-prefetchable) [size=256K] Region 4: I/O ports at b000
>>> [size=256] Expansion ROM at fb9a0000 [disabled] [size=128K]
>>> Capabilities: [48] Vendor Specific Information: Len=08 <?>
>>> Capabilities: [50] Power Management version 3 Flags: PMEClk- DSI-
>>> D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-) Status: D0
>>> NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [58]
>>> Express (v2) Legacy Endpoint, MSI 00 DevCap: MaxPayload 256 bytes,
>>> PhantFunc 0, Latency L0s <4us, L1 unlimited ExtTag+ AttnBtn-
>>> AttnInd- PwrInd- RBE+ FLReset- DevCtl: Report errors: Correctable-
>>> Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag- PhantFunc- AuxPwr-
>>> NoSnoop+ MaxPayload 128 bytes, MaxReadReq 512 bytes
>>>                 DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+
>>> AuxPwr- TransPend- LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s
>>> L1, Exit Latency L0s <64ns, L1 <1us ClockPM- Surprise- LLActRep-
>>> BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
>>>                         ExtSynch- ClockPM- AutWidDis- BWInt-
>>> AutBWInt- LnkSta: Speed 5GT/s, Width x16, TrErr- Train- SlotClk+
>>> DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Not
>>> Supported, TimeoutDis-, LTR-, OBFF Not Supported DevCtl2: Completion
>>> Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled LnkCtl2:
>>> Target Link Speed: 8GT/s, EnterCompliance- SpeedDis- Transmit
>>> Margin: Normal Operating Range, EnterModifiedCompliance-
>>> ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current
>>> De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
>>> EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
>>> Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Address:
>>> 00000000fee00000  Data: 4023 Capabilities: [100 v1] Vendor Specific
>>> Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150 v2]
>>> Advanced Error Reporting UESta:  DLP- SDES- TLP- FCP- CmpltTO-
>>> CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UEMsk:
>>> DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP-
>>> ECRC- UnsupReq- ACSViol- UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO-
>>> CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- CESta:
>>> RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ CEMsk:
>>> RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ AERCap:
>>> First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
>>> Capabilities: [270 v1] #19 Capabilities: [2b0 v1] Address
>>> Translation Service (ATS) ATSCap: Invalidate Queue Depth: 00 ATSCtl:
>>> Enable-, Smallest Translation Unit: 00 Capabilities: [2c0 v1] #13
>>>         Capabilities: [2d0 v1] #1b
>>>         Kernel driver in use: radeon
>>>
>>> (pardon the wrapping)
>>>
>>> starting last week sometime, my displayport driven monitor (center
>>> of 3 monitors) began randomly blanking out. The only way to
>>> (sometimes) correct it for maybe 2 or three hours was to power down,
>>> then power up. if I just rebooted, it would almost always blank in a
>>> matter of minutes after login.
>>>
>>> I am converting the DP into DVI with an active dongle, but this has
>>> worked flawlessly for me in the past.
>>>
>>> I started booting the last debian kernel, which is 3.12.2, and so far
>>> the blanking has not re-appeared. I think I probably need to run this
>>> kernel for a couple of days to verify that it is somehow related to a
>>> software change to be sure my dongle is not really flaking out,
>>> but thought I would post a heads up here in case anyone might know of
>>> any changes that may have caused this behavior.
>>
>>Is there anyway you could bisect?
>>
>>Alex
>>_______________________________________________
>
>
> I'm probably not the best one to do that. But I can say it definitely
> appeared in the last week or so, and debian kernel 3.12.2 does not
> exhibit the behavior.

Can you at least narrow down what debian kernel package it appeared
in?  3.12 is really old from an upstream perspective.

Alex