Created attachment 122851 [details] dmesg output with kernel parameters drm.debug=0x1e log_buf_len=4M got a new HP Envy notebook and see screen continous flashing after some seconds. Happens sometimes after 2sec, sometimes after 30s. Annoying found dmesg entry [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun System is opensuse tumbleweed uname -rm 4.5.0-3-default x86_64 attached dmesg output with drm.debug=0x1e looks similar to Bug #94605 cat /sys/class/drm/card0/error no error state collected
Same here on a Clarkdale CPU. This happens to me every time I switch from X.org to tty. Doesn't happen when running Wayland instead of X. System: Fedora 24 Beta, also present with Fedora 23. Since at least 2 kernel versions.
I can confirm this as of Linux 4.6.2-1-ARCH. CPU is Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz. Sometimes the bug causes my system to completely freeze and I have to reboot with the power button. In journal I see: Jun 24 10:51:01 miki-laptop kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun but the worse one is: Jun 24 10:30:34 miki-laptop kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun Jun 24 10:39:25 miki-laptop kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Jun 24 10:39:25 miki-laptop kernel: IP: [< (null)>] (null) Jun 24 10:39:25 miki-laptop kernel: PGD 84d3e067 PUD 8523c067 PMD 0 Jun 24 10:39:25 miki-laptop kernel: Oops: 0010 [#1] PREEMPT SMP Jun 24 10:39:25 miki-laptop kernel: Modules linked in: fuse sha256_ssse3 sha256_generic hmac drbg ansi_cprng ctr ccm uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev Jun 24 10:39:25 miki-laptop kernel: glue_helper ablk_helper snd input_leds cryptd cfg80211 led_class serio_raw pcspkr soundcore i2c_i801 hci_uart shpchp btbcm i2c_hid thermal wmi btqca hid elan_i2c Jun 24 10:39:25 miki-laptop kernel: drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm intel_agp intel_gtt Jun 24 10:39:25 miki-laptop kernel: CPU: 0 PID: 765 Comm: Xorg Tainted: G U O 4.6.2-1-ARCH #1 Jun 24 10:39:25 miki-laptop kernel: Hardware name: ASUSTeK COMPUTER INC. UX305UA/UX305UA, BIOS UX305UA.201 10/12/2015 Jun 24 10:39:25 miki-laptop kernel: task: ffff8802692b0f40 ti: ffff880084d34000 task.ti: ffff880084d34000 Jun 24 10:39:25 miki-laptop kernel: RIP: 0010:[<0000000000000000>] [< (null)>] (null) Jun 24 10:39:25 miki-laptop kernel: RSP: 0018:ffff880084d37af0 EFLAGS: 00010286 Jun 24 10:39:25 miki-laptop kernel: RAX: ffff880084d37bb8 RBX: ffff88026a1b5c00 RCX: 000000000001fd36 Jun 24 10:39:25 miki-laptop kernel: RDX: 000000000001fd36 RSI: ffff8802685220f8 RDI: ffff88026a1b5f00 Jun 24 10:39:25 miki-laptop kernel: RBP: ffff880084d37b78 R08: ffff88026a1b5f00 R09: ffff88026a1b5f00 Jun 24 10:39:25 miki-laptop kernel: R10: ffff88020a43ed00 R11: 0000000000000000 R12: 0000000000000001 Jun 24 10:39:25 miki-laptop kernel: R13: ffff880268523368 R14: ffff8802685220f8 R15: 0000000000000000 Jun 24 10:39:25 miki-laptop kernel: FS: 00007fb7671b8940(0000) GS:ffff880273c00000(0000) knlGS:0000000000000000 Jun 24 10:39:25 miki-laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 24 10:39:25 miki-laptop kernel: CR2: 0000000000000000 CR3: 000000007f387000 CR4: 00000000003406f0 Jun 24 10:39:25 miki-laptop kernel: Stack: Jun 24 10:39:25 miki-laptop kernel: ffffffffa0122da0 ffff880268520000 ffff8802685220f8 0001fd36000400d8 Jun 24 10:39:25 miki-laptop kernel: ffff880084d37bb8 ffff8801cb6cf3c0 ffff88026a1b5c00 ffff880230579cc0 Jun 24 10:39:25 miki-laptop kernel: ffff880084d37b40 ffffffffa0125ffd ffff880084d37b80 00000000afcbbfb4 Jun 24 10:39:25 miki-laptop kernel: Call Trace: Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0122da0>] ? i915_gem_object_sync+0x1b0/0x340 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0125ffd>] ? i915_gem_object_pin+0x2d/0x30 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0135abd>] intel_execlists_submission+0x1cd/0x440 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0114a20>] i915_gem_do_execbuffer.isra.14+0xaf0/0x1450 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffff812e6ae9>] ? idr_get_empty_slot+0x189/0x370 Jun 24 10:39:25 miki-laptop kernel: [<ffffffff812e6d53>] ? idr_alloc+0x83/0x100 Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0018079>] ? drm_gem_handle_create_tail+0xc9/0x1a0 [drm] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa01160d4>] i915_gem_execbuffer2+0xd4/0x250 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0018aa2>] drm_ioctl+0x152/0x540 [drm] Jun 24 10:39:25 miki-laptop kernel: [<ffffffffa0116000>] ? i915_gem_execbuffer+0x330/0x330 [i915] Jun 24 10:39:25 miki-laptop kernel: [<ffffffff81209bc3>] do_vfs_ioctl+0xa3/0x5d0 Jun 24 10:39:25 miki-laptop kernel: [<ffffffff814a1091>] ? __sys_recvmsg+0x51/0x90 Jun 24 10:39:25 miki-laptop kernel: [<ffffffff8120a169>] SyS_ioctl+0x79/0x90 Jun 24 10:39:25 miki-laptop kernel: [<ffffffff815c7272>] entry_SYSCALL_64_fastpath+0x1a/0xa4 Jun 24 10:39:25 miki-laptop kernel: Code: Bad RIP value. Jun 24 10:39:25 miki-laptop kernel: RIP [< (null)>] (null) Jun 24 10:39:25 miki-laptop kernel: RSP <ffff880084d37af0> Jun 24 10:39:25 miki-laptop kernel: CR2: 0000000000000000 Jun 24 10:39:25 miki-laptop kernel: ---[ end trace 946c0a8763286b97 ]--- Jun 24 10:39:25 miki-laptop org.a11y.atspi.Registry[5911]: XIO: fatal IO error 11 (Resource temporarily unavailable) on X server :0 Jun 24 10:39:25 miki-laptop org.a11y.atspi.Registry[5911]: after 2113 requests (2113 known processed) with 0 events remaining. -- Reboot --
Created attachment 125310 [details] dmesg output rui@joaninha:~$ uname -a Linux joaninha 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Please try the last drm-intel-nightly from http://cgit.freedesktop.org/drm-intel and report back.
Please re-test with Paulo's patch to apply memory workarounds for skylake: https://patchwork.freedesktop.org/series/13548/
doesnt happen anymore with recent updates here
(In reply to Thomas from comment #6) > doesnt happen anymore with recent updates here Thanks Thomas
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