[Bug 79261] [snb] [Samsung NP530U3C-A02CL] [drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=79261

--- Comment #23 from NicoM <nicolas.menegale at openwide.fr> ---
Same things for me, I went from stable to jessie (so 3.2 to 3.16.0-4-amd64) and
I have this error at every startup:
[   47.977548] ------------[ cut here ]------------
[   47.977592] WARNING: CPU: 0 PID: 1114 at
/build/linux-CMiYW9/linux-3.16.7-ckt2/drivers/gpu/drm/i915/intel_display.c:953
ironlake_crtc_disable+0x90/0x910 [i915]()
[   47.977595] pipe_off wait timed out
[   47.977597] Modules linked in: ctr ccm pci_stub vboxpci(O) vboxnetadp(O)
bnep vboxnetflt(O) vboxdrv(O) binfmt_misc nfsd auth_rpcgss oid_registry nfs_acl
nfs lockd fscache sunrpc ecb uvcvideo videobuf2_vmalloc videobuf2_memops
videobuf2_core v4l2_common videodev media btusb bluetooth 6lowpan_iphc
intel_powerclamp joydev coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel
aesni_intel arc4 aes_x86_64 lrw iwldvm mac80211 gf128mul snd_hda_codec_realtek
snd_hda_codec_hdmi snd_hda_codec_generic i915 iTCO_wdt iTCO_vendor_support
dell_wmi glue_helper sparse_keymap nouveau dell_laptop ablk_helper cryptd
dcdbas snd_hda_intel snd_hda_controller mxm_wmi ttm drm_kms_helper iwlwifi
evdev psmouse snd_hda_codec cfg80211 serio_raw snd_hwdep pcspkr drm mei_me
lpc_ich snd_pcm mfd_core mei snd_timer wmi intel_ips
[   47.977666]  i2c_algo_bit snd i2c_i801 i2c_core soundcore rfkill video ac
dell_smo8800 battery shpchp button acpi_cpufreq processor loop fuse parport_pc
ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 sg sd_mod sr_mod crc_t10dif
cdrom crct10dif_generic hid_generic usbhid hid crct10dif_pclmul
crct10dif_common crc32c_intel ahci libahci libata xhci_hcd ehci_pci ehci_hcd
r8169 scsi_mod mii usbcore usb_common fan thermal thermal_sys
[   47.977718] CPU: 0 PID: 1114 Comm: Xorg Tainted: G        W  O 
3.16.0-4-amd64 #1 Debian 3.16.7-ckt2-1
[   47.977720] Hardware name: Dell Inc. XPS L501X  /00CKNG, BIOS A04 11/26/2010
[   47.977723]  0000000000000009 ffffffff81507263 ffff880091cf3b40
ffffffff81065847
[   47.977727]  ffff880151ca0000 ffff880091cf3b90 0000000000000001
ffff880090e48338
[   47.977731]  ffff880090e48340 ffffffff810658ac ffffffffa068a7da
ffffffff00000018
[   47.977736] Call Trace:
[   47.977746]  [<ffffffff81507263>] ? dump_stack+0x41/0x51
[   47.977753]  [<ffffffff81065847>] ? warn_slowpath_common+0x77/0x90
[   47.977757]  [<ffffffff810658ac>] ? warn_slowpath_fmt+0x4c/0x50
[   47.977779]  [<ffffffffa06305a0>] ? ironlake_crtc_disable+0x90/0x910 [i915]
[   47.977799]  [<ffffffffa0626388>] ?
intel_dump_pipe_config.isra.47+0x38/0x350 [i915]
[   47.977818]  [<ffffffffa0631b73>] ? __intel_set_mode+0x293/0x1560 [i915]
[   47.977837]  [<ffffffffa0635442>] ? intel_set_mode+0x12/0x30 [i915]
[   47.977856]  [<ffffffffa063634f>] ? intel_crtc_set_config+0x8cf/0xd50 [i915]
[   47.977872]  [<ffffffffa035fd11>] ? drm_mode_set_config_internal+0x61/0xe0
[drm]
[   47.977885]  [<ffffffffa03634e5>] ? drm_mode_setcrtc+0xd5/0x570 [drm]
[   47.977896]  [<ffffffffa03548b7>] ? drm_ioctl+0x1c7/0x5b0 [drm]
[   47.977904]  [<ffffffff811b7d2f>] ? do_vfs_ioctl+0x2cf/0x4b0
[   47.977909]  [<ffffffff81069015>] ? SyS_setitimer+0xc5/0xf0
[   47.977913]  [<ffffffff811b7f91>] ? SyS_ioctl+0x81/0xa0
[   47.977919]  [<ffffffff8150d32d>] ? system_call_fast_compare_end+0x10/0x15
[   47.977921] ---[ end trace 77c0a790e547eed7 ]---
[   48.356787] [drm:ibx_irq_handler] *ERROR* PCH transcoder A FIFO underrun
[   48.381388] [drm:ibx_irq_handler] *ERROR* PCH transcoder B FIFO underrun

It doesn't seems to make X unstable (even if I had some crash with awesome
window manager)

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