[Bug 95063] [SKL] random system hang with RC6 enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95063

--- Comment #27 from Tomas Janousek <tomi at nomi.cz> ---
I'm getting a similar thing occasionally with a docked ThinkPad T25 (Kaby
Lake). If it's not docker, this never occurs. I do have GuC/HuC firmwares
loaded. The error looks like this:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
[drm:pipe_config_err [i915]] *ERROR* mismatch in pixel_rate (expected 154000,
found 307999)
[drm:pipe_config_err [i915]] *ERROR* mismatch in shared_dpll (expected
0000000063430065, found 000000001a62afe4)
[drm:pipe_config_err [i915]] *ERROR* mismatch in dpll_hw_state.ctrl1 (expected
0x00000003, found 0x00000001)
[drm:pipe_config_err [i915]] *ERROR* mismatch in base.adjusted_mode.crtc_clock
(expected 154000, found 307999)
[drm:pipe_config_err [i915]] *ERROR* mismatch in port_clock (expected 270000,
found 540000)
------------[ cut here ]------------
pipe state doesn't match!
WARNING: CPU: 0 PID: 4947 at
/build/linux-s3QDK1/linux-4.18.10/drivers/gpu/drm/i915/intel_display.c:11767
intel_atomic_commit_tail+0xcd6/0xd40 [i915]
Modules linked in: cmac rfcomm ctr ccm xt_CHECKSUM ipt_MASQUERADE bridge stp
llc xt_tcpudp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT
nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat nf_conntrack_ipv6
nf_defrag_ipv6 nf_nat
 binfmt_misc nls_ascii nls_cp437 vfat fat arc4 snd_soc_skl intel_rapl
snd_soc_skl_ipc x86_pkg_temp_thermal intel_powerclamp snd_soc_sst_ipc
snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi kvm_intel i915 snd_soc_core kvm
iwlmvm irqbypass 
 nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_h323
nf_conntrack_irc nf_conntrack_ftp nf_conntrack crc32c_generic coretemp ecryptfs
loop efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto btrfs
xor zstd_
CPU: 0 PID: 4947 Comm: Xorg Tainted: G     U     O      4.18.0-2-amd64 #1
Debian 4.18.10-2
Hardware name: LENOVO 20K70000GE/20K70000GE, BIOS N1QET78W (1.53 ) 09/13/2018
RIP: 0010:intel_atomic_commit_tail+0xcd6/0xd40 [i915]
Code: b6 44 24 18 e9 14 f8 ff ff e8 e6 c1 05 c3 0f 0b e9 35 f8 ff ff e8 da c1
05 c3 0f 0b 0f b6 14 24 e9 42 fd ff ff e8 ca c1 05 c3 <0f> 0b e9 a1 f8 ff ff e8
be c1 05 c3 0f 0b 49 8b 46 50 e9 ac fd ff 
RSP: 0018:ffffa1ab0854bbf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000006
RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff8fece2416730
RBP: ffff8fecb8240328 R08: 00000000000003ea R09: 000000000000000a
R10: ffffffffc11f91b0 R11: ffffffff857cffad R12: ffff8febaa445800
R13: ffff8fecb4002800 R14: ffff8febaa443000 R15: ffff8fecb8240000
FS:  0000000000000000(0000) GS:ffff8fece2400000(0063) knlGS:00000000f7680d40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000348dac8ff000 CR3: 000000087897e002 CR4: 00000000003606f0
Call Trace:
 intel_atomic_commit+0x29a/0x2d0 [i915]
 drm_mode_atomic_ioctl+0x822/0x9a0 [drm]
 ? drm_atomic_set_property+0x510/0x510 [drm]
 drm_ioctl_kernel+0xa1/0xf0 [drm]
 ? __switch_to_asm+0x40/0x70
 drm_ioctl+0x2eb/0x390 [drm]
 ? drm_atomic_set_property+0x510/0x510 [drm]
 ? __schedule+0x2bf/0x880
 __ia32_compat_sys_ioctl+0xce/0x240
 do_fast_syscall_32+0x98/0x1d6
 entry_SYSENTER_compat+0x7f/0x91
---[ end trace 7ca6a67aeeffddb3 ]---

Shall I open a new bug or is this related?

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