<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;">LG Displays are being reported as "disconnected" when they are powered off (currently connected through DVI to mini-displayport adapter)</div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;">Only seeing this with LG displays (have tested NEC and Samsung *limited model types for each manufacturer*). With the LG display connected to the graphics card and powered off the system is reporting the DisplayPort as disconnected. In any kernel <= 4.4.0-31 the system would report the DisplayPort as connected even if the LG display was off. </div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;"><b class=""><font size="4" class="">Kernel tested on</font></b></div><div class="" style="font-family: ArialMT;">Linux version 4.4.0-66-generic (buildd@lgw01-28) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #87-Ubuntu</div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;"><b class=""><font size="4" class="">Most recent kernel without the bug: </font></b></div><div class="" style="font-family: ArialMT;">Linux version 4.4.0-31-generic (buildd@lgw01-16) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #50-Ubuntu</div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;">"cat /sys/class/drm/card1-DP-1/status" will show the status as disconnected if the LG display is powered off</div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;"><b class=""><font size="4" class="">Environment</font></b></div><div class="" style="font-family: ArialMT;"><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Ubuntu 16.04</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span><b class="">Graphics Card:</b> Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Radeon Graphics Drivers</div></div><div class="" style="font-family: ArialMT;"><span class="Apple-tab-span" style="white-space: pre;"> </span><b class="">Kernel: </b>4.4.0-66</div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;"><br class=""></div><div class="" style="font-family: ArialMT;"><font size="4" class=""><b class="">Processor</b></font></div><div class="" style="font-family: ArialMT;"><div class="">processor<span class="Apple-tab-span" style="white-space: pre;"> </span>: 0-3</div><div class="">vendor_id<span class="Apple-tab-span" style="white-space: pre;"> </span>: AuthenticAMD</div><div class="">cpu family<span class="Apple-tab-span" style="white-space: pre;"> </span>: 21</div><div class="">model<span class="Apple-tab-span" style="white-space: pre;"> </span>: 48</div><div class="">model name<span class="Apple-tab-span" style="white-space: pre;"> </span>: AMD A8-7600 Radeon R7, 10 Compute Cores 4C+6G</div><div class="">stepping<span class="Apple-tab-span" style="white-space: pre;"> </span>: 1</div><div class="">microcode<span class="Apple-tab-span" style="white-space: pre;"> </span>: 0x6003106</div><div class="">cpu MHz<span class="Apple-tab-span" style="white-space: pre;"> </span>: 1400.000</div><div class="">cache size<span class="Apple-tab-span" style="white-space: pre;"> </span>: 2048 KB</div><div class="">physical id<span class="Apple-tab-span" style="white-space: pre;"> </span>: 0</div><div class="">siblings<span class="Apple-tab-span" style="white-space: pre;"> </span>: 4</div><div class="">core id<span class="Apple-tab-span" style="white-space: pre;"> </span>: 0</div><div class="">cpu cores<span class="Apple-tab-span" style="white-space: pre;"> </span>: 2</div><div class="">apicid<span class="Apple-tab-span" style="white-space: pre;"> </span>: 16</div><div class="">initial apicid<span class="Apple-tab-span" style="white-space: pre;"> </span>: 0</div><div class="">fpu<span class="Apple-tab-span" style="white-space: pre;"> </span>: yes</div><div class="">fpu_exception<span class="Apple-tab-span" style="white-space: pre;"> </span>: yes</div><div class="">cpuid level<span class="Apple-tab-span" style="white-space: pre;"> </span>: 13</div><div class="">wp<span class="Apple-tab-span" style="white-space: pre;"> </span>: yes</div><div class="">flags<span class="Apple-tab-span" style="white-space: pre;"> </span>: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb bpext cpb hw_pstate vmmcall fsgsbase bmi1 xsaveopt arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold</div><div class="">bugs<span class="Apple-tab-span" style="white-space: pre;"> </span>: fxsave_leak sysret_ss_attrs</div><div class="">bogomips<span class="Apple-tab-span" style="white-space: pre;"> </span>: 6188.48</div><div class="">TLB size<span class="Apple-tab-span" style="white-space: pre;"> </span>: 1536 4K pages</div><div class="">clflush size<span class="Apple-tab-span" style="white-space: pre;"> </span>: 64</div><div class="">cache_alignment<span class="Apple-tab-span" style="white-space: pre;"> </span>: 64</div><div class="">address sizes<span class="Apple-tab-span" style="white-space: pre;"> </span>: 48 bits physical, 48 bits virtual</div><div class="">power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro [13]</div><div class="" style="font-weight: bold;"><br class=""></div><div class="" style="font-weight: bold;"><br class=""></div><div class="" style="font-weight: bold;"><font size="4" class="">Loaded driver and hardware information</font></div><div class="" style="font-weight: bold;"><span class="" style="font-size: 14px;">cat /proc/ioports:</span></div><div class=""><div class="">0000-03af : PCI Bus 0000:00</div><div class=""> 0000-001f : dma1</div><div class=""> 0020-0021 : pic1</div><div class=""> 0040-0043 : timer0</div><div class=""> 0050-0053 : timer1</div><div class=""> 0060-0060 : keyboard</div><div class=""> 0061-0061 : PNP0800:00</div><div class=""> 0064-0064 : keyboard</div><div class=""> 0070-0071 : rtc0</div><div class=""> 0080-008f : dma page reg</div><div class=""> 00a0-00a1 : pic2</div><div class=""> 00c0-00df : dma2</div><div class=""> 00f0-00ff : PNP0C04:00</div><div class=""> 00f0-00ff : fpu</div><div class="">03b0-03df : PCI Bus 0000:00</div><div class=""> 03c0-03df : vesafb</div><div class="">03e0-0cf7 : PCI Bus 0000:00</div><div class=""> 03f8-03ff : serial</div><div class=""> 040b-040b : pnp 00:08</div><div class=""> 04d0-04d1 : pnp 00:07</div><div class=""> 04d0-04d1 : pnp 00:08</div><div class=""> 04d6-04d6 : pnp 00:08</div><div class=""> 0800-0803 : ACPI PM1a_EVT_BLK</div><div class=""> 0804-0805 : ACPI PM1a_CNT_BLK</div><div class=""> 0808-080b : ACPI PM_TMR</div><div class=""> 0810-0815 : ACPI CPU throttle</div><div class=""> 0820-0827 : ACPI GPE0_BLK</div><div class=""> 0900-090f : pnp 00:08</div><div class=""> 0910-091f : pnp 00:08</div><div class=""> 0a00-0a0f : pnp 00:03</div><div class=""> 0a00-0a07 : f71882fg</div><div class=""> 0a10-0a1f : pnp 00:03</div><div class=""> 0b00-0b07 : piix4_smbus</div><div class=""> 0b20-0b3f : pnp 00:08</div><div class=""> 0b20-0b27 : piix4_smbus</div><div class=""> 0c00-0c01 : pnp 00:08</div><div class=""> 0c14-0c14 : pnp 00:08</div><div class=""> 0c50-0c51 : pnp 00:08</div><div class=""> 0c52-0c52 : pnp 00:08</div><div class=""> 0c6c-0c6c : pnp 00:08</div><div class=""> 0c6f-0c6f : pnp 00:08</div><div class=""> 0cd0-0cd1 : pnp 00:08</div><div class=""> 0cd2-0cd3 : pnp 00:08</div><div class=""> 0cd4-0cd5 : pnp 00:08</div><div class=""> 0cd6-0cd7 : pnp 00:08</div><div class=""> 0cd8-0cdf : pnp 00:08</div><div class="">0cf8-0cff : PCI conf1</div><div class="">0d00-ffff : PCI Bus 0000:00</div><div class=""> d000-dfff : PCI Bus 0000:02</div><div class=""> d000-d0ff : 0000:02:00.0</div><div class=""> d000-d0ff : r8169</div><div class=""> e000-efff : PCI Bus 0000:01</div><div class=""> e000-e0ff : 0000:01:00.0</div><div class=""> f000-f0ff : 0000:00:01.0</div><div class=""> f100-f10f : 0000:00:11.0</div><div class=""> f100-f10f : ahci</div><div class=""> f110-f113 : 0000:00:11.0</div><div class=""> f110-f113 : ahci</div><div class=""> f120-f127 : 0000:00:11.0</div><div class=""> f120-f127 : ahci</div><div class=""> f130-f133 : 0000:00:11.0</div><div class=""> f130-f133 : ahci</div><div class=""> f140-f147 : 0000:00:11.0</div><div class=""> f140-f147 : ahci</div><div class=""> fe00-fefe : pnp 00:08</div></div></div><div class="" style="font-family: ArialMT;"><font size="4" class=""><br class=""></font></div><div class="" style="font-family: ArialMT;"><b class=""><font size="4" class="">PCI Information</font></b></div><div class="" style="font-family: ArialMT;"><div class="">01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [Radeon HD 7750/8740 / R7 250E] (prog-if 00 [VGA controller])</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Subsystem: Hightech Information System Ltd. Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Latency: 0, Cache Line Size: 64 bytes</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Interrupt: pin A routed to IRQ 48</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Region 2: Memory at fea00000 (64-bit, non-prefetchable) [size=256K]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Region 4: I/O ports at e000 [size=256]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Expansion ROM at fea40000 [disabled] [size=128K]</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [48] Vendor Specific Information: Len=08 <?></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [50] Power Management version 3</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>DevCap:<span class="Apple-tab-span" style="white-space: pre;"> </span>MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>DevCtl:<span class="Apple-tab-span" style="white-space: pre;"> </span>Report errors: Correctable- Non-Fatal- Fatal- Unsupported-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MaxPayload 256 bytes, MaxReadReq 512 bytes</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>DevSta:<span class="Apple-tab-span" style="white-space: pre;"> </span>CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>LnkCap:<span class="Apple-tab-span" style="white-space: pre;"> </span>Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>LnkCtl:<span class="Apple-tab-span" style="white-space: pre;"> </span>ASPM Disabled; RCB 64 bytes Disabled- CommClk+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>LnkSta:<span class="Apple-tab-span" style="white-space: pre;"> </span>Speed 8GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> Compliance De-emphasis: -6dB</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+, EqualizationPhase1+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span> EqualizationPhase2+, EqualizationPhase3+, LinkEqualizationRequest-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Address: 00000000fee00000 Data: 0000</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [150 v2] Advanced Error Reporting</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>UESta:<span class="Apple-tab-span" style="white-space: pre;"> </span>DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>UEMsk:<span class="Apple-tab-span" style="white-space: pre;"> </span>DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>UESvrt:<span class="Apple-tab-span" style="white-space: pre;"> </span>DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>CESta:<span class="Apple-tab-span" style="white-space: pre;"> </span>RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>CEMsk:<span class="Apple-tab-span" style="white-space: pre;"> </span>RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>AERCap:<span class="Apple-tab-span" style="white-space: pre;"> </span>First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [200 v1] #15</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Capabilities: [270 v1] #19</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Kernel driver in use: radeon</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Kernel modules: radeon</div><div class=""><br class=""></div></div></div><div class=""><br class=""></div><div class=""><br class=""></div><br class=""><div class=""> <div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Arial, sans-serif; margin: 0in 0in 0.0001pt; line-height: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><span style="color: rgb(94, 94, 94); font-family: Arial; font-size: small;" class="">Tom Reddish </span></div><div style="color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 11px; margin: 0in 0in 0.0001pt; line-height: normal; widows: 1;" class=""><font face="Arial" size="2" color="#5e5e5e" class=""><span class="" style="line-height: normal;"><span style="background-color: rgb(255, 254, 254);" class="">Software Engineer</span><br class=""></span><span class="" style="background-color: rgb(255, 255, 255); line-height: normal;">MediaVue Systems</span><br class=""></font></div><div style="color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 11px; margin: 0in 0in 0.0001pt; line-height: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><span class="" style="color: rgb(94, 94, 94); font-family: Arial; line-height: normal;"><span style="font-size: small;" class="">Skype: t.reddish</span></span></div><div style="color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 11px; margin: 0in 0in 0.0001pt; line-height: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><span class="" style="color: rgb(94, 94, 94); font-family: Arial; line-height: normal;"><span style="font-size: small;" class="">Tel: +1 781.926.0676</span></span></div><div style="color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 11px; margin: 0in 0in 0.0001pt; line-height: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><font face="Arial" size="2" color="#5e5e5e" class=""><a href="www.mediavuesystems.com" class="">w</a><span class="" style="line-height: normal;"><a href="www.mediavuesystems.com" class="">ww.mediavuesystems.com</a></span></font></div></div> </div> <br class=""></body></html>