[Bug 86105] [C220] Display goes blank with PCH PWM1 enabled warning in intel_display.c:7376/6900

Sat Dec 20 15:49:33 PST 2014

https://bugs.freedesktop.org/show_bug.cgi?id=86105

--- Comment #16 from Wouter Van Hemel <wouter-freedesktop at publica.duodecim.org> ---
I have been experiencing the same bug the last months on Debian Testing
(upcoming Jessie) with the stock kernel on a Thinkpad T440s.

After the computer has been on for a few days, the screen starts blanking out
randomly every n seconds (say every 1-60 seconds); sometimes the contents
re-appears by itself immediately, but it always comes back after pushing a
button - as if a power-saving screensaver randomly triggers. The problem never
goes away once it has manifested itself (until a reboot).

The logs show a warning at intel_display.c, line 7256 in my case.

root at debian:~# uname -a
Linux debian 3.16.0-4-amd64 #1 SMP Debian 3.16.7-2 (2014-11-06) x86_64
GNU/Linux

root at debian:~# cat /sys/module/snd_hda_intel/parameters/power_save
0
root at debian:~# cat /sys/bus/pci/devices/0000:00:03.0/power/control
on
root at debian:~# cat
/sys/devices/pci0000:00/0000:00:02.0/power/autosuspend_delay_ms
10000
root at debian:~# cat /sys/devices/pci0000:00/0000:00:02.0/power/control
on

Dec 20 17:21:59 debian kernel: ------------[ cut here ]------------
Dec 20 17:21:59 debian kernel: WARNING: CPU: 0 PID: 19001 at
/build/linux-Y9HjRe/linux-3.16.7/drivers/gpu/drm/i915/intel_display.c:7256
hsw_enable_pc8+0x463/0x5e0 [i915]()
Dec 20 17:21:59 debian kernel: CRTC for pipe A enabled
Dec 20 17:21:59 debian kernel: Modules linked in: usb_storage nfnetlink_queue
nfnetlink_log nfnetlink cpuid ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs
libcrc32c dm_mod ctr ccm bnep binfmt_misc pci_stub vboxpci(O) vboxnetadp(O)
vboxnetflt(O) vboxdrv(O) nfsd auth_rpcgss oid_registry nfs_acl nfs lockd
fscache sunrpc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
ecb uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common
btusb videodev media bluetooth 6lowpan_iphc joydev btrfs xor iTCO_wdt
iTCO_vendor_support mspro_block nls_utf8 nls_cp437 arc4 vfat fat rtsx_pci_sdmmc
rtsx_pci_ms mmc_core memstick raid6_pq x86_pkg_temp_thermal intel_powerclamp
intel_rapl coretemp kvm_intel kvm crc32_pclmul crc32c_intel ghash_clmulni_intel
aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
Dec 20 17:21:59 debian kernel:  evdev psmouse efi_pstore serio_raw pcspkr
efivars i2c_i801 sg wmi iwlmvm mac80211 snd_hda_intel snd_hda_controller
iwlwifi i915 cfg80211 ac battery ehci_pci thinkpad_acpi tpm_tis xhci_hcd
ehci_hcd nvram rtsx_pci tpm e1000e drm_kms_helper snd_hda_codec rfkill drm
snd_hwdep intel_smartconnect button snd_pcm video i2c_algo_bit i2c_core usbcore
lpc_ich snd_timer ptp usb_common mfd_core pps_core mei_me shpchp snd mei
soundcore processor fuse autofs4 ext4 crc16 mbcache jbd2 sd_mod crc_t10dif
crct10dif_generic ahci crct10dif_pclmul crct10dif_common libahci libata
scsi_mod thermal thermal_sys
Dec 20 17:21:59 debian kernel: CPU: 0 PID: 19001 Comm: kworker/0:0 Tainted: G  
     W  O  3.16.0-4-amd64 #1 Debian 3.16.7-2
Dec 20 17:21:59 debian kernel: Hardware name: LENOVO 20AQCTO1WW/20AQCTO1WW,
BIOS GJET64WW (2.14 ) 11/12/2013
Dec 20 17:21:59 debian kernel: Workqueue: pm pm_runtime_work
Dec 20 17:21:59 debian kernel:  0000000000000009 ffffffff81506b43
ffff88011b75fca8 ffffffff81065717
Dec 20 17:21:59 debian kernel:  ffff880211aa0000 ffff88011b75fcf8
ffff880037af2b70 ffff880214c0d098
Dec 20 17:21:59 debian kernel:  0000000000000000 ffffffff8106577c
ffffffffa0525824 ffff880200000020
Dec 20 17:21:59 debian kernel: Call Trace:
Dec 20 17:21:59 debian kernel:  [<ffffffff81506b43>] ? dump_stack+0x41/0x51
Dec 20 17:21:59 debian kernel:  [<ffffffff81065717>] ?
warn_slowpath_common+0x77/0x90
Dec 20 17:21:59 debian kernel:  [<ffffffff8106577c>] ?
warn_slowpath_fmt+0x4c/0x50
Dec 20 17:21:59 debian kernel:  [<ffffffffa04bdf02>] ?
lpt_disable_clkout_dp+0x62/0xc0 [i915]
Dec 20 17:21:59 debian kernel:  [<ffffffffa04ce843>] ?
hsw_enable_pc8+0x463/0x5e0 [i915]
Dec 20 17:21:59 debian kernel:  [<ffffffffa047a895>] ?
intel_runtime_suspend+0x185/0x860 [i915]
Dec 20 17:21:59 debian kernel:  [<ffffffff812dfc89>] ?
pci_pm_runtime_suspend+0x59/0x120
Dec 20 17:21:59 debian kernel:  [<ffffffff813a6fac>] ? __rpm_callback+0x2c/0x80
Dec 20 17:21:59 debian kernel:  [<ffffffff813a701f>] ? rpm_callback+0x1f/0x80
Dec 20 17:21:59 debian kernel:  [<ffffffff813a7187>] ? rpm_suspend+0x107/0x5f0
Dec 20 17:21:59 debian kernel:  [<ffffffff8107042a>] ?
internal_add_timer+0x2a/0x70
Dec 20 17:21:59 debian kernel:  [<ffffffff81072667>] ? mod_timer+0x127/0x1e0
Dec 20 17:21:59 debian kernel:  [<ffffffff813a8622>] ?
pm_runtime_work+0x72/0xa0
Dec 20 17:21:59 debian kernel:  [<ffffffff8107f4b2>] ?
process_one_work+0x172/0x420
Dec 20 17:21:59 debian kernel:  [<ffffffff8107fb45>] ?
worker_thread+0x115/0x520
Dec 20 17:21:59 debian kernel:  [<ffffffff81508f61>] ? __schedule+0x2b1/0x710
Dec 20 17:21:59 debian kernel:  [<ffffffff8107fa30>] ?
rescuer_thread+0x2d0/0x2d0
Dec 20 17:21:59 debian kernel:  [<ffffffff81085ddd>] ? kthread+0xbd/0xe0
Dec 20 17:21:59 debian kernel:  [<ffffffff81085d20>] ?
kthread_create_on_node+0x180/0x180
Dec 20 17:21:59 debian kernel:  [<ffffffff8150cb7c>] ? ret_from_fork+0x7c/0xb0
Dec 20 17:21:59 debian kernel:  [<ffffffff81085d20>] ?
kthread_create_on_node+0x180/0x180
Dec 20 17:21:59 debian kernel: ---[ end trace 853201e081f87534 ]---

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