<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB] [4.4 regression] vblank wait timed out on crtc" href="https://bugs.freedesktop.org/show_bug.cgi?id=93509#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB] [4.4 regression] vblank wait timed out on crtc" href="https://bugs.freedesktop.org/show_bug.cgi?id=93509">bug 93509</a> from <a class="email" href="mailto:hamelg@laposte.net" title="Gilles Hamel <hamelg@laposte.net>"> Gilles Hamel</a> <pre>I confirm this bug. Sometimes, Xserver hangs when switching back VT from text mode to graphical display. When it hangs, suspend2ram and resume fixes the issue. Here is the stack : ------------[ cut here ]------------ WARNING: CPU: 2 PID: 10921 at drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b0/0x1c0 [drm]() vblank wait timed out on crtc 0 Modules linked in: sha256_ssse3 sha256_generic hmac drbg ansi_cprng ctr ccm joydev mousedev iTCO_wdt i syscopyarea mei sysfillrect sysimgblt fb_sys_fops i2c_algo_bit snd_timer ptp pps_core nvram snd sound CPU: 2 PID: 10921 Comm: Xorg Tainted: G U W O 4.4.5-1-ARCH #1 Hardware name: LENOVO 4236JZ5/4236JZ5, BIOS 83ET78WW (1.48 ) 01/21/2016 0000000000000286 0000000074de7b7f ffff8800c2edf810 ffffffff812cb391 ffff8800c2edf858 ffffffffa0533272 ffff8800c2edf848 ffffffff810776e2 ffff880118b99800 0000000000000000 0000000000000000 00000000000ac2c4 Call Trace: [<ffffffff812cb391>] dump_stack+0x63/0x82 [<ffffffff810776e2>] warn_slowpath_common+0x82/0xc0 [<ffffffff8107777c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffff810b8825>] ? finish_wait+0x55/0x70 [<ffffffff810747eb>] ? __mmdrop+0x7b/0xd0 [<ffffffffa0506840>] drm_wait_one_vblank+0x1b0/0x1c0 [drm] [<ffffffff810b8cc0>] ? wake_atomic_t_function+0x60/0x60 [<ffffffffa0791685>] intel_atomic_commit+0x475/0x1430 [i915] [<ffffffffa051f55e>] ? drm_atomic_check_only+0x18e/0x590 [drm] [<ffffffffa051f307>] ? drm_atomic_add_affected_connectors+0x27/0xf0 [drm] [<ffffffffa051f997>] drm_atomic_commit+0x37/0x60 [drm] [<ffffffffa0572faf>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper] [<ffffffffa0575313>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper] [<ffffffffa057538d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper] [<ffffffffa07a819a>] intel_fbdev_set_par+0x1a/0x60 [i915] [<ffffffff812f2db9>] ? __percpu_counter_add+0x59/0x80 [<ffffffff8133fa46>] fb_set_var+0x236/0x460 [<ffffffff8117db21>] ? shmem_recalc_inode+0x71/0xa0 [<ffffffff810a744c>] ? __enqueue_entity+0x6c/0x70 [<ffffffff810adfeb>] ? enqueue_entity+0x1fb/0xd20 [<ffffffff813366ef>] fbcon_blank+0x30f/0x350 [<ffffffff813b2ef3>] do_unblank_screen+0xc3/0x190 [<ffffffff813a941a>] vt_ioctl+0x50a/0x12e0 [<ffffffff811f0050>] ? filename_parentat+0xe0/0x150 [<ffffffff8139d731>] tty_ioctl+0x361/0xc30 [<ffffffff813e5693>] ? vga_arb_release+0xe3/0x130 [<ffffffff811c33d0>] ? kfree+0x170/0x180 [<ffffffff811fff5c>] ? mntput_no_expire+0x2c/0x1b0 [<ffffffff811f3258>] do_vfs_ioctl+0x298/0x480 [<ffffffff811fd307>] ? __fget+0x77/0xb0 [<ffffffff811f34b9>] SyS_ioctl+0x79/0x90 [<ffffffff815970ee>] entry_SYSCALL_64_fastpath+0x12/0x6d ---[ end trace 5926662876f4c875 ]---</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>