dp blanks randomly with errors

Tue Dec 16 07:49:50 PST 2014

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