Created attachment 122522 [details] hwinfo I have a lenovo s430, with a intel 4000 card. I use kde 5. I use an external monitor connected to a mini display port and a other monitor to a mini dvi port. When i use both monitor, laptop internal monitor can be used. Sometime when i wakeup computer, i get this error. [21993.165977] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [21993.165996] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [21993.166025] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [21993.166038] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [21995.198821] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [21995.198853] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [21995.231812] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [21995.231834] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [22032.247835] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B [22032.247915] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [22032.263893] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B [22032.263971] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun [22032.285129] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [22032.285200] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [22032.302019] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [22032.302093] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [22032.353641] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [22032.353693] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [22086.321397] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable link training [22086.324124] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start channel equalization [22100.677866] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [22100.677885] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [22100.677906] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [22100.677919] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [22100.724238] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B [22100.724271] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B [22100.807561] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [22100.807580] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [22131.559050] kactivitymanage[4360]: segfault at 7f3e9eb6bd10 ip 00007f3e9eb82de1 sp 00007ffde18db4b8 error 4 in libQt5Sql.so.5.5.1[7f3e9eb6d000+3f000] [22131.927057] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [22131.927076] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [22131.927930] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [22131.927945] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [22132.066741] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [22132.066764] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [22132.095551] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B habitually computer wakeup, i see the login screen of kde... but i can't type in the text box... so i do ctrl-alt-backspace... that seem to restart x and that work i use kernel 4.5.0 http://lkml.iu.edu/hypermail/linux/kernel/1603.2/00737.html
that happen sometime without supsens to ram. i can use only some application and bang that happen... i can continue to use open application, but i can't click on the kde menu desktop, taskbar...
FWIW, I experienced a similar problem on my IVB desktop. This still happens on 4.6-rc2+, too.
[314528.713994] kactivitymanage[28875]: segfault at 7f2012f7cd10 ip 00007f2012f93de1 sp 00007ffe511560d8 error 4 in libQt5Sql.so.5.5.1[7f2012f7e000+3f000] [314529.196484] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [314529.196503] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [314529.196531] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [314529.196545] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [314529.575021] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [314529.575043] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B [314529.598097] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B [314529.598121] [drm:intel_check_pch_fifo_underruns [i915]] *ERROR* pch fifo underrun on pch transcoder B same problem with 4.5.0-2
I'm using Ubuntu 16.04 with 4.6.0-040600-generic from Mainline Kernel builds and I'm experiencing a similar bug, with this log in dmesg: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun I'm using a 2015 MacBook with 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller]) and when this dmesg line appears, my xorg session completely freeze, only the mouse pointer keeps moving. I can switch to another tty and the system is working normally, restarting XOrg works too
Is this issue still seen with latest kernel?
that work now
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.