Switching to console worked, in my attempt for 4.0 it didn't work at all.
Including stack traces which might help fix some errors though.
This is zbook 14 - dual gpu with intel/vga_switcheroo.
Linux feather 4.1.0-rc5-bla+ #4 SMP PREEMPT Tue May 26 19:17:04 CEST 2015
x86_64 GNU/Linux
This is plain 4.1.0-rc5 with 2 more commits from main git. No `my' changes.
Rest is Debian Jessie:
ii xserver-xorg-video-ati 1:7.5.0-1
[ 28.837695] ------------[ cut here ]------------
[ 28.838452] WARNING: CPU: 0 PID: 4639 at drivers/gpu/drm/drm_ioctl.c:144
drm_setversion+0x176/0x180()
[ 28.839231] No drm_driver.set_busid() implementation provided by
0xffffffff824e77c0. Use drm_dev_set_unique() to set the unique name explicitly.
[ 28.839285] Modules linked in:
[ 28.840540] nfnetlink_queue nfnetlink_log nfnetlink btrfs xor tpm_infineon
raid6_pq intel_rapl iosf_mbi x86_pkg_temp_thermal joydev crc32_pclmul iwlmvm
iwlwifi xhci_pci xhci_hcd e1000e intel_smartconnect tpm_tis tpm_rng tpm
[ 28.842975] CPU: 0 PID: 4639 Comm: Xorg Not tainted 4.1.0-rc5-bla+ #4
[ 28.844343] Hardware name: Hewlett-Packard HP ZBook 14/198F, BIOS L71 Ver.
01.20 07/28/2014
[ 28.845571] 00000000ffffffff 00000000671b4f82 ffffffff82175639
ffffffff81d55e44
[ 28.846843] ffff880087c47d10 ffffffff810e423c ffff880087c47de0
ffff88043a007000
[ 28.848186] ffff880438b10cc0 fffffffffffffff2 0000000000000007
ffffffff810e42c8
[ 28.849439] Call Trace:
[ 28.850708] [<ffffffff81d55e44>] ? dump_stack+0x4a/0x74
[ 28.851873] [<ffffffff810e423c>] ? warn_slowpath_common+0x7c/0xb0
[ 28.853236] [<ffffffff810e42c8>] ? warn_slowpath_fmt+0x58/0x80
[ 28.854588] [<ffffffff81581806>] ? drm_setversion+0x176/0x180
[ 28.855845] [<ffffffff81581256>] ? drm_ioctl+0x316/0x5b0
[ 28.856977] [<ffffffff81581690>] ? drm_noop+0x30/0x30
[ 28.858051] [<ffffffff81221dee>] ? do_filp_open+0x3e/0xb0
[ 28.859291] [<ffffffff81224388>] ? do_vfs_ioctl+0x308/0x510
[ 28.860191] [<ffffffff81175f9c>] ? __audit_syscall_entry+0xbc/0x110
[ 28.861068] [<ffffffff8105c01b>] ? syscall_trace_enter_phase1+0x13b/0x1a0
[ 28.861920] [<ffffffff812245c6>] ? SyS_ioctl+0x36/0x80
[ 28.862775] [<ffffffff81d638d7>] ? system_call_fastpath+0x12/0x6a
[ 28.863634] ---[ end trace fdbd327690626ad6 ]---
[
[ 29.315320] ------------[ cut here ]------------
[ 29.315328] WARNING: CPU: 0 PID: 4639 at drivers/gpu/drm/drm_ioctl.c:144
drm_setversion+0x176/0x180()
[ 29.315334] No drm_driver.set_busid() implementation provided by
0xffffffff824e77c0. Use drm_dev_set_unique() to set the unique name explicitly.
[ 29.315336] Modules linked in:
[ 29.315337] nfnetlink_queue nfnetlink_log nfnetlink btrfs xor tpm_infineon
raid6_pq intel_rapl iosf_mbi x86_pkg_temp_thermal joydev crc32_pclmul iwlmvm
iwlwifi xhci_pci xhci_hcd e1000e intel_smartconnect tpm_tis tpm_rng tpm
[ 29.315351] CPU: 0 PID: 4639 Comm: Xorg Tainted: G W
4.1.0-rc5-bla+ #4
[ 29.315353] Hardware name: Hewlett-Packard HP ZBook 14/198F, BIOS L71 Ver.
01.20 07/28/2014
[ 29.315354] 00000000ffffffff 00000000671b4f82 ffffffff82175639
ffffffff81d55e44
[ 29.315357] ffff880087c47d10 ffffffff810e423c ffff880087c47de0
ffff88043a007000
[ 29.315360] ffff880436fd8cc0 fffffffffffffff2 0000000000000007
ffffffff810e42c8
[ 29.315362] Call Trace:
[ 29.315368] [<ffffffff81d55e44>] ? dump_stack+0x4a/0x74
[ 29.315373] [<ffffffff810e423c>] ? warn_slowpath_common+0x7c/0xb0
[ 29.315376] [<ffffffff810e42c8>] ? warn_slowpath_fmt+0x58/0x80
[ 29.315378] [<ffffffff81581806>] ? drm_setversion+0x176/0x180
[ 29.315380] [<ffffffff81581256>] ? drm_ioctl+0x316/0x5b0
[ 29.315382] [<ffffffff81581690>] ? drm_noop+0x30/0x30
[ 29.315386] [<ffffffff81221dee>] ? do_filp_open+0x3e/0xb0
[ 29.315389] [<ffffffff81224388>] ? do_vfs_ioctl+0x308/0x510
[ 29.315393] [<ffffffff81175f9c>] ? __audit_syscall_entry+0xbc/0x110
[ 29.315396] [<ffffffff8105c01b>] ? syscall_trace_enter_phase1+0x13b/0x1a0
[ 29.315398] [<ffffffff8122e163>] ? __fget+0x63/0xa0
[ 29.315400] [<ffffffff812245c6>] ? SyS_ioctl+0x36/0x80
[ 29.315404] [<ffffffff81d638d7>] ? system_call_fastpath+0x12/0x6a
[ 29.315406] ---[ end trace fdbd327690626ad7 ]---
[ 29.317397] dmar: DRHD: handling fault status reg 2
[ 29.317400] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr
7300000000
DMAR:[fault reason 05] PTE Write access is not set
[ 29.581646] dmar: DRHD: handling fault status reg 2
[ 29.581651] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr
7300000000
DMAR:[fault reason 05] PTE Write access is not set
[ 29.591198] dmar: DRHD: handling fault status reg 2
[ 29.591205] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr
7300000000
DMAR:[fault reason 05] PTE Write access is not set