dp blanks randomly with errors

Tue Dec 16 13:38:28 PST 2014

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.

-C