<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A" href="https://bugs.freedesktop.org/show_bug.cgi?id=93055#c11">Comment # 11</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A" href="https://bugs.freedesktop.org/show_bug.cgi?id=93055">bug 93055</a> from <a class="email" href="mailto:patrik.flykt@linux.intel.com" title="Patrik Flykt <patrik.flykt@linux.intel.com>"> Patrik Flykt</a> <pre>This is seen also on 4.10.15 kernels. Every now and then, like 2-4 times a day, the external screen goes black and resumes after a 2-4 seconds. After that the screen comes back, no corruptions detected and everything is back to normal. I have not seen this happen on the laptop panel. The following message is found in the kernel log: [ 5330.717754] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun Machine: Dell XPS 13 lspci -vnn: 00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:5916] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:075b] Flags: bus master, fast devsel, latency 0, IRQ 131 Memory at db000000 (64-bit, non-prefetchable) [size=16M] Memory at 90000000 (64-bit, prefetchable) [size=256M] I/O ports at f000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [40] Vendor Specific Information: Len=0c <?> Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [100] Process Address Space ID (PASID) Capabilities: [200] Address Translation Service (ATS) Capabilities: [300] Page Request Interface (PRI) Kernel driver in use: i915 /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 142 model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz stepping : 9 microcode : 0x48 cpu MHz : 567.645 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 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 pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp bugs : bogomips : 5808.00 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management:</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>