freeze with drm/i915

[Francesco Allertsen]

Hello everyone,

I have experienced since few kernel releases some freezes of my PC. The
freeze is totally random, it can happen two times in one hour or nothing
for an entire week, and the open programs are never the same (except
maybe for Chromium).

Last week I had the time to bisect the problem to try to solve it,
because I found that since few releases I get the following report on
dmesg:

[   15.993547] ------------[ cut here ]------------
[   15.993577] WARNING: at drivers/gpu/drm/i915/intel_display.c:1028 intel_wait_for_pipe_off+0x11b/0x126 [i915]()
[   15.993579] Hardware name: 5129CTO
[   15.993581] pipe_off wait timed out
[   15.993582] Modules linked in: vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) snd_hda_codec_hdmi snd_hda_codec_conexant i915 snd_hda_intel snd_hda_codec snd_hwdep drm_kms_helper
[   15.993593] Pid: 1566, comm: X Tainted: G           O 3.8.1 #1
[   15.993595] Call Trace:
[   15.993604]  [<c102b501>] warn_slowpath_common+0x68/0x7d
[   15.993617]  [<f862bffb>] ? intel_wait_for_pipe_off+0x11b/0x126 [i915]
[   15.993621]  [<c102b589>] warn_slowpath_fmt+0x2b/0x2f
[   15.993635]  [<f862bffb>] intel_wait_for_pipe_off+0x11b/0x126 [i915]
[   15.993649]  [<f862c11b>] intel_disable_pipe+0x115/0x11d [i915]
[   15.993662]  [<f862c6ab>] ironlake_crtc_disable+0xb2/0x688 [i915]
[   15.993677]  [<f8631e84>] intel_set_mode+0x398/0x7b0 [i915]
[   15.993683]  [<c104c0b7>] ? should_resched+0x8/0x22
[   15.993688]  [<c1538632>] ? _cond_resched+0xd/0x21
[   15.993694]  [<c10f3317>] ? __getblk+0x28/0x282
[   15.993697]  [<c10f24af>] ? __find_get_block_slow+0x11c/0x12a
[   15.993713]  [<f863277a>] intel_crtc_set_config+0x4de/0x651 [i915]
[   15.993718]  [<c12bcde2>] drm_mode_setcrtc+0x34b/0x39d
[   15.993721]  [<c12bca97>] ? drm_mode_setplane+0x27a/0x27a
[   15.993725]  [<c12b217b>] drm_ioctl+0x275/0x323
[   15.993727]  [<c12bca97>] ? drm_mode_setplane+0x27a/0x27a
[   15.993730]  [<c12b1f06>] ? drm_version+0x8b/0x8b
[   15.993734]  [<c10dcc84>] vfs_ioctl+0x20/0x2a
[   15.993736]  [<c10dd656>] do_vfs_ioctl+0x3eb/0x429
[   15.993740]  [<c10d1598>] ? fsnotify_modify+0x48/0x53
[   15.993743]  [<c10d122e>] ? wait_on_retry_sync_kiocb+0x44/0x44
[   15.993745]  [<c10d18ff>] ? vfs_write+0x8a/0xac
[   15.993748]  [<c10dd6d5>] sys_ioctl+0x41/0x60
[   15.993751]  [<c1539274>] syscall_call+0x7/0xb
[   15.993753] ---[ end trace fe4cfed2900ae9cb ]---

Then after the bisect the following is the first commit that trigger
this warning:

284637d9229dc1115947bb04008730844afbc059 is the first bad commit
commit 284637d9229dc1115947bb04008730844afbc059
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Jul 9 09:51:57 2012 +0200

    drm/i915: WARN if the pipe won't turn off

    This seems to be the symptom of a few neat bugs, hence be more
    obnoxious when this fails.

So, it seems that there is some other bug somewhere. If you have any
idea or you need more tests from me I'm happy to figure it out.

Currently I am using the kernel 3.8.1, but I would like to test the
latest git soon if someone has already solved it or not. My laptop is a
Lenovo X201s and this is my video card:

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 215a
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 44
	Region 0: Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 1800 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
		Address: fee0f00c  Data: 41d1
	Capabilities: [d0] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [a4] PCI Advanced Features
		AFCap: TP+ FLR+
		AFCtrl: FLR-
		AFStatus: TP-
	Kernel driver in use: i915

If you need more information please just let me know.

Thank you.

Regards,
Francesco