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Date:	Thu, 3 Jan 2013 23:09:39 +0200
From:	Alexey Zaytsev <alexey.zaytsev@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Rodrigo Vivi <rodrigo.vivi@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...il.com>,
	stable@...r.kernel.org
Subject: Re: Linux 3.8-rc2

On Thu, Jan 3, 2013 at 5:36 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> It's a new year, people are getting back to work, and trying
> desperately to forget the over-eating that has been going on for the
> last two weeks. And hey, to celebrate, here's -rc2!
>
> The patch is fairly small, and largely dominated by the GPU updates
> and the trivial removal of __devinit/exit in the i2c layer. But
> there's some filesystem work (ext4, ecryptfs, ceph) and some VM fixes
> in there to. And some late ARM OMAP cleanups.
>
> The shortlog is appended, my "mergelog" looks like this:
>

Hi.

i915 got broken on my machine (Lenovo ThinkPad SL500) by this -rc. The screen
goes blank after loading the module. I've bisected the problem to
b0a2658acb5bf9ca86b4aab011b7106de3af0add "drm/i915: don't disable
disconnected outputs".
Here is the backtrace:
[  176.446564] [drm] Initialized drm 1.1.0 20060810
[  176.805864] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[  176.805932] [drm] Driver supports precise vblank timestamp query.
[  176.806063] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[  177.026017] fbcon: inteldrmfb (fb0) is primary device
[  177.028509] i915: fixme: max PWM is zero
[  177.700246] divide error: 0000 [#1] SMP
[  177.700340] Modules linked in: i915(+) i2c_algo_bit drm_kms_helper
drm i2c_core cpufreq_conservative cpufreq_userspace cpufreq_stats
cpufreq_powersave binfmt_misc uinput fuse ext2 loop firewire_sbp2
snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwldvm snd_hda_intel
snd_hda_codec mac80211 snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm
iwlwifi snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi
psmouse snd_seq cfg80211 iTCO_wdt iTCO_vendor_support acpi_cpufreq
mperf snd_timer snd_seq_device lpc_ich processor snd asus_laptop
input_polldev ehci_pci sparse_keymap rfkill serio_raw evdev button ac
battery mfd_core pcspkr soundcore video ext3 mbcache jbd
sha256_generic cbc dm_crypt dm_mod netconsole configfs sg sd_mod
crc_t10dif sdhci_pci firewire_ohci ahci thermal thermal_sys libahci
sdhci mmc_core libata firewire_core scsi_mod crc_itu_t r8169 mii
uhci_hcd ehci_hcd usbcore usb_common
[  177.700363] CPU 1
[  177.700364] Pid: 4048, comm: modprobe Not tainted 3.8.0-rc2 #32
LENOVO                         2746EKU/2746EKU
[  177.700438] RIP: 0010:[<ffffffffa048fabf>]  [<ffffffffa048fabf>]
g4x_compute_wm0+0xc6/0x125 [i915]
[  177.700441] RSP: 0018:ffff880035983200  EFLAGS: 00010216
[  177.700444] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000040
[  177.700447] RDX: 0000000000000000 RSI: 00000000000003e8 RDI: 0000000000000000
[  177.700450] RBP: ffff880035983228 R08: ffffffffa04acca0 R09: 0000000000001388
[  177.700453] R10: ffffffffa04acc70 R11: ffff88003598326c R12: ffff880035983264
[  177.700456] R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000001fc0
[  177.700461] FS:  0000000000000000(0000) GS:ffff8800bdb00000(0063)
knlGS:00000000f75b4b40
[  177.700464] CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
[  177.700467] CR2: 00000000f7740000 CR3: 00000000b9ea9000 CR4: 00000000000007e0
[  177.700469] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  177.700472] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  177.700477] Process modprobe (pid: 4048, threadinfo
ffff880035982000, task ffff8800b5e86a90)
[  177.700478] Stack:
[  177.700485]  ffff8800b5654000 0000000000000001 ffff8800b9159800
0000000000000001
[  177.700491]  0000000000000001 ffff880035983298 ffffffffa0493054
ffff880035983264
[  177.700497]  ffff88003598326c 0000000000061200 ffff880035c91500
ffff8800359832a8
[  177.700498] Call Trace:
[  177.700566]  [<ffffffffa0493054>] g4x_update_wm+0x83/0x1d3 [i915]
[  177.700633]  [<ffffffffa04939e0>] intel_update_watermarks+0x19/0x1b [i915]
[  177.700690]  [<ffffffffa0479e1a>] i9xx_crtc_enable+0x65/0x1a0 [i915]
[  177.700750]  [<ffffffffa047fb78>] intel_set_mode+0x728/0x821 [i915]
[  177.700813]  [<ffffffffa0480226>] intel_crtc_set_config+0x5b5/0x75f [i915]
[  177.700823]  [<ffffffff810c662e>] ? ____cache_alloc+0x205/0x586
[  177.700832]  [<ffffffff811897a3>] ? rb_insert_color+0xf3/0xf5
[  177.700845]  [<ffffffffa045290f>] drm_fb_helper_set_par+0x69/0xb2
[drm_kms_helper]
[  177.700852]  [<ffffffff811c3bd9>] fbcon_init+0x30c/0x409
[  177.700861]  [<ffffffff8120fe34>] visual_init+0xb8/0x10f
[  177.700868]  [<ffffffff81210ef6>] bind_con_driver+0x163/0x263
[  177.700875]  [<ffffffff8121102e>] take_over_console+0x38/0x45
[  177.700881]  [<ffffffff811c0511>] fbcon_takeover+0x56/0x98
[  177.700887]  [<ffffffff811c42fb>] fbcon_event_notify+0x2c1/0x5ea
[  177.700894]  [<ffffffff81048dd4>] notifier_call_chain+0x32/0x5c
[  177.700900]  [<ffffffff81048f07>] __blocking_notifier_call_chain+0x41/0x5a
[  177.700906]  [<ffffffff81048f2f>] blocking_notifier_call_chain+0xf/0x11
[  177.700913]  [<ffffffff811b7e12>] fb_notifier_call_chain+0x16/0x18
[  177.700918]  [<ffffffff811b91b2>] register_framebuffer+0x1fd/0x261
[  177.700929]  [<ffffffffa0452b26>]
drm_fb_helper_single_fb_probe+0x1ce/0x297 [drm_kms_helper]
[  177.700940]  [<ffffffffa0452dc6>]
drm_fb_helper_initial_config+0x1d7/0x1f1 [drm_kms_helper]
[  177.700946]  [<ffffffff810c6a26>] ? __kmalloc+0x77/0xa1
[  177.701012]  [<ffffffffa0496d84>] intel_fbdev_init+0x6f/0x82 [i915]
[  177.701059]  [<ffffffffa045fcd8>] i915_driver_load+0xa34/0xc02 [i915]
[  177.701097]  [<ffffffffa040626d>] drm_get_pci_dev+0x15e/0x266 [drm]
[  177.701143]  [<ffffffffa045c483>] i915_pci_probe+0x60/0x69 [i915]
[  177.701150]  [<ffffffff811a2870>] pci_device_probe+0x6a/0xaf
[  177.701158]  [<ffffffff8122b2b6>] ? driver_probe_device+0x1c3/0x1c3
[  177.701164]  [<ffffffff8122b18d>] driver_probe_device+0x9a/0x1c3
[  177.701170]  [<ffffffff8122b310>] __driver_attach+0x5a/0x7e
[  177.701176]  [<ffffffff8122993f>] bus_for_each_dev+0x4f/0x81
[  177.701182]  [<ffffffff8122ac95>] driver_attach+0x19/0x1b
[  177.701187]  [<ffffffff8122a947>] bus_add_driver+0xe3/0x207
[  177.701194]  [<ffffffff8122b897>] driver_register+0x8e/0x114
[  177.701200]  [<ffffffff811a1efe>] __pci_register_driver+0x46/0x48
[  177.701229]  [<ffffffffa04063fb>] drm_pci_init+0x86/0xeb [drm]
[  177.701244]  [<ffffffffa04d1000>] ? 0xffffffffa04d0fff
[  177.701284]  [<ffffffffa04d1066>] i915_init+0x66/0x68 [i915]
[  177.701292]  [<ffffffff81000232>] do_one_initcall+0x7a/0x12c
[  177.701302]  [<ffffffffa04d1000>] ? 0xffffffffa04d0fff
[  177.701309]  [<ffffffff8106e55e>] load_module+0x1690/0x1945
[  177.701314]  [<ffffffff8106b8d2>] ? free_notes_attrs+0x48/0x48
[  177.701321]  [<ffffffff8102441f>] ? do_page_fault+0x9/0xe
[  177.701328]  [<ffffffff8106e8b5>] sys_init_module+0xa2/0xb1
[  177.701336]  [<ffffffff812d70e5>] sysenter_dispatch+0x7/0x1a
[  177.701383] Code: 4f c7 31 d2 48 98 48 8d 44 01 ff 48 f7 f1 41 03
42 18 41 89 04 24 41 8b 52 08 39 d0 0f 4f c2 41 89 04 24 41 69 c6 e8
03 00 00 99 <f7> fb 41 89 c6 44 89 c8 99 41 f7 fe 05 e8 03 00 00 99 f7
fe 49
[  177.701449]  RSP <ffff880035983200>
[  177.701454] ---[ end trace 43f59db2364f49ab ]---

I've also attached dmesg from the same system, -rc2 with the commit reverted.

Download attachment "dmesg" of type "application/octet-stream" (57567 bytes)

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