[Bug 97450] [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97450

--- Comment #38 from v at robolab.it ---
Retyped the error message for search engines and terminal users. Judging by
lots of 'fb' (framebuffer?) lines it seems that this error appeared because I
have switched to terminal and is not related to the actual system freeze.


WARNING: CPU: 0 PID: 1993 at ../drivers/gpu/drm/i915/intel_display.c:13647
intel_atomic_commit_tail+0x1054/0x1060 [i915]
pipe A vblank wait timed out
Modules linked in: (...many modules here...)
CPU: 0 PID: 1993 Comm: Xorg Tainted: G        W  O    4.8.1-3.gf7183f5-default
#1
Hardware name: CLEVO P64xRE/P64xRE  powered by premamod.com, BIOS 1.05.07PM v1
07/29/2016
0000000000000000 ffffffffa03a3df2 ffff8aa9ed7f7918 0000000000000000
ffffffffa007ddde ffff8aa9f0d30000 ffff8aa9ed7f7968 0000000000000000
0000000000000000 0000000000000000 ffff8aa9f08e3000 ffffffffa007de4f
Call Trace:
[<ffffffffa002eefe>] dump_trace+0x5e/0x310
[<ffffffffa002f2cb>] show_stack_log_lvl+0x11b/0x1a0
[<ffffffffa0030001>] show_stack+0x21/0x40
[<ffffffffa03a3df2>] dump_stack+0x5c/0x7a
[<ffffffffa007ddde>] __warn+0xbe/0xe0
[<ffffffffa007de4f>] warn_slowpath_fmt+0x4f/0x60
[<ffffffffc04b2c64>] intel_atomic_commit_tail+0x1054/0x1060 [i915]
[<ffffffffc04b307c>] intel_atomic_commit+0x40c/0x510 [i915]
[<ffffffffc03ff4dc>] restore_fbdev_mode+0x14c/0x270 [drm_kms_helper]
[<ffffffffc0400f7e>] drm_fb_helper_restore_fbdev_mode_unlocked+0x2e/0x70
[drm_kms_helper]
[<ffffffffc0400fe9>] drm_fb_helper_set_par+0x29/0x50 [drm_kms_helper]
[<ffffffffc04cc0b6>] intel_fbdev_set_par+0x16/0x60 [i915]
[<ffffffffa0419e40>] fb_set_var+0x200/0x3e0
[<ffffffffa0410b28>] fbcon_blank+0x2b8/0x2f0
[<ffffffffa04a2517>] do_unblank_screen+0xc7/0x190
[<ffffffffa0498374>] complete_change_console+0x54/0xd0
[<ffffffffa0498aa1>] vt_ioctl+0x6b1/0x1230
[<ffffffffa048d44e>] tty_ioctl+0x33e/0xc20
[<ffffffffa022c2af>] do_vfs_ioctl+0x8f/0x5d0
[<ffffffffa022c864>] SyS_ioctl+0x74/0x80
[<ffffffffa06d43f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
DWARF2 unwinder stuck at entry_SYSCALL_64_fastpath+0x1e/0xa8

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