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[Cornogle <1432405@xxxxxxxxxxxxxxxxxx>]

on the yoga 2 851f tablet I am also trying often to get KMS working but
like with the 3.19.y branch still no luck.

I am using vanilla kernels, and also with one or two patches of /from
the fedlet image derived.

here the short debug from linux-stable v4.0.0 (and all previous versions
like rc1 till rc7 too)

BOOT_IMAGE=/vmlinuz-4.0.0.6 root=UUID=6c3bcf92-5a26-4dde-
95e3-78ceb9aaa35b ro i915.modeset=1 rhgb quiet LANG=de_DE.UTF-8
i915.force_backlight_pmic=1

lshw:
        *-display
             description: VGA compatible controller
             product: Atom Processor Z36xxx/Z37xxx Series Graphics & Display
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 0d
             width: 32 bits
             clock: 33MHz
             capabilities: pm msi vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:205 memory:90000000-903fffff memory:80000000-8fffffff ioport:1000(size=8)

lspci:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0d) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 7270
        Flags: bus master, fast devsel, latency 0, IRQ 205
        Memory at 90000000 (32-bit, non-prefetchable) [size=4M]
        Memory at 80000000 (32-bit, prefetchable) [size=256M]
        I/O ports at 1000 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [d0] Power Management version 2
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [b0] Vendor Specific Information: Len=07 <?>
        Kernel driver in use: i915

snap of dmesg:
[    1.275627] [drm] Initialized drm 1.1.0 20060810
[    1.277552] [drm] Memory usable by graphics device = 2048M
[    1.277574] checking generic (80000000 8ca000) vs hw (80000000 10000000)
[    1.277579] fb: switching to inteldrmfb from simple
[    1.277631] Console: switching to colour dummy device 80x25
[    1.277848] [drm] Replacing VGA console driver
[    1.279567] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.279573] [drm] Driver supports precise vblank timestamp query.
[    1.279600] [drm:intel_parse_bios] *ERROR* Unknown element
[    1.279611] [drm:intel_parse_bios] *ERROR* Sequence elements going beyond block itself. Sequence block parsing failed
[    1.317468] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    1.331700] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    1.332138] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input1
[    1.332227] [drm] Initialized i915 1.6.0 20150130 for 0000:00:02.0 on minor 0
...
[    1.388711] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[    1.402951] fbcon: inteldrmfb (fb0) is primary device
[    2.382620] i8042: No controller found
[    2.382647] Switched to clocksource tsc
[    2.382801] mousedev: PS/2 mouse device common for all mice
[    2.383565] ACPI Warning: Could not enable fixed event - RealTimeClock (4) (20150204/evxface-654)
[    2.383878] rtc_cmos 00:00: rtc core: registered rtc_cmos as rtc0
[    2.384137] rtc_cmos: probe of 00:00 failed with error -22
...
[    2.564883] Console: switching to colour frame buffer device 150x120
[    2.597839] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    2.597842] i915 0000:00:02.0: registered panic notifier
[    2.603428] Freeing unused kernel memory: 784K (c0ed1000 - c0f95000)
...
[    3.689692] usb 1-1.2.3: Product: Dell USB Keyboard
[    3.689696] usb 1-1.2.3: Manufacturer: Dell
[    3.690069] usb 1-1.2.3: ep 0x81 - rounding interval to 128 microframes, ep desc says 192 microframes
[    3.696168] input: Dell Dell USB Keyboard as /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1.2/1-1.2.3/1-1.2.3:1.0/0003:413C:2003.0002/input/input3
[    3.747717] hid-generic 0003:413C:2003.0002: input,hidraw1: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:14.0-1.2.3/input0
[    3.753699] ax88179_178a 1-1.3:1.0 eth0: register 'ax88179_178a' at usb-0000:00:14.0-1.3, ASIX AX88179 USB 3.0 Gigabit Ethernet, 00:fe:c8:f7:bc:d
9
[    3.753760] usbcore: registered new interface driver ax88179_178a
[    3.757735] ax88179_178a 1-1.3:1.0 enp0s20u1u3: renamed from eth0
[    3.838426] ------------[ cut here ]------------
[    3.838467] WARNING: CPU: 2 PID: 264 at drivers/gpu/drm/drm_irq.c:1138 drm_wait_one_vblank+0x177/0x180()
[    3.838479] vblank wait timed out on crtc 0
[    3.838488] Modules linked in: ax88179_178a usbnet mii
[    3.838526] CPU: 2 PID: 264 Comm: plymouthd Not tainted 4.0.0.6 #81
[    3.838537] Hardware name: LENOVO 60072/INVALID, BIOS 02WT18WW 08/01/2014
[    3.838548]  c0e31947 d6eaedba 00000000 f689bc70 c0b13585 f689bcb0 f689bca0 c0449d57
[    3.838585]  c0d9d7f8 f689bcd0 00000108 c0d7050b 00000472 c07cbe57 c07cbe57 00000000
[    3.838620]  f4b77800 00000000 f689bcbc c0449dce 00000009 f689bcb0 c0d9d7f8 f689bcd0
[    3.838656] Call Trace:
[    3.838685]  [<c0b13585>] dump_stack+0x41/0x52
[    3.838710]  [<c0449d57>] warn_slowpath_common+0x87/0xc0
[    3.838731]  [<c07cbe57>] ? drm_wait_one_vblank+0x177/0x180
[    3.838750]  [<c07cbe57>] ? drm_wait_one_vblank+0x177/0x180
[    3.838771]  [<c0449dce>] warn_slowpath_fmt+0x3e/0x60
[    3.838791]  [<c07cbe57>] drm_wait_one_vblank+0x177/0x180
[    3.838815]  [<c0481480>] ? prepare_to_wait_event+0xc0/0xc0
[    3.838835]  [<c07cbe79>] drm_crtc_wait_one_vblank+0x19/0x20
[    3.838857]  [<c07bb86a>] drm_plane_helper_commit+0x24a/0x280
[    3.838878]  [<c07bb918>] drm_plane_helper_update+0x78/0xc0
[    3.838898]  [<c084c63c>] intel_crtc_set_config+0xa1c/0xde0
[    3.838922]  [<c07d448e>] drm_mode_set_config_internal+0x4e/0xc0
[    3.838942]  [<c07d7f06>] drm_mode_setcrtc+0xc6/0x5a0
[    3.838963]  [<c07d7e40>] ? drm_mode_setplane+0x230/0x230
[    3.838982]  [<c07ca38f>] drm_ioctl+0x1cf/0x520
[    3.839004]  [<c05618a5>] ? kmem_cache_alloc_trace+0x175/0x1e0
[    3.839024]  [<c0524182>] ? free_hot_cold_page_list+0x42/0x90
[    3.839043]  [<c07d7e40>] ? drm_mode_setplane+0x230/0x230
[    3.839065]  [<c06864a2>] ? af_alg_cmsg_send+0xc2/0xd0
[    3.839089]  [<c07ca1c0>] ? drm_getmap+0xc0/0xc0
[    3.839130]  [<c058342a>] do_vfs_ioctl+0x30a/0x510
[    3.839151]  [<c06596b2>] ? inode_has_perm.isra.34+0x32/0x40
[    3.839170]  [<c0659807>] ? file_has_perm+0x97/0xa0
[    3.839191]  [<c065a55c>] ? selinux_file_ioctl+0x4c/0xf0
[    3.839212]  [<c0583690>] SyS_ioctl+0x60/0x90
[    3.839240]  [<c06864a2>] ? af_alg_cmsg_send+0xc2/0xd0
[    3.839260]  [<c06864a2>] ? af_alg_cmsg_send+0xc2/0xd0
[    3.839280]  [<c0b1bb8f>] sysenter_do_call+0x12/0x12
[    3.839300]  [<c06864a2>] ? af_alg_cmsg_send+0xc2/0xd0
[    3.839319]  [<c06864a2>] ? af_alg_cmsg_send+0xc2/0xd0
[    3.839334] ---[ end trace 409865246eac131f ]---

and after that I tried a build with the merge of intel-drm-nightly like
it was suggested in comment 13 on this bug
https://bugzilla.kernel.org/show_bug.cgi?id=92171

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https://bugs.launchpad.net/bugs/1432405

Title:
  [Toshiba Equium A100-306] WARNING: CPU: 0 PID: 968 at
  /build/buildd/linux-3.19.0/drivers/gpu/drm/drm_irq.c:1121
  drm_wait_one_vblank+0x170/0x180 [drm]()

Status in The Linux Kernel:
  Confirmed
Status in linux package in Ubuntu:
  Triaged

Bug description:
  Noticed during boot of vivid after upgrade:

  [   54.762967] ------------[ cut here ]------------
  [   54.763009] WARNING: CPU: 1 PID: 968 at /build/buildd/linux-3.19.0/drivers/gpu/drm/drm_irq.c:1121 drm_wait_one_vblank+0x170/0x180 [drm]()
  [   54.763012] vblank not available on crtc 0, ret=-22
  [   54.763014] Modules linked in: binfmt_misc snd_hda_codec_si3054 arc4 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel iwl3945 snd_hda_controller iwlegacy snd_hda_codec mac80211 snd_hwdep pcmcia snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi yenta_socket cfg80211 coretemp pcmcia_rsrc tifm_7xx1 snd_seq pcmcia_core tifm_core joydev lpc_ich serio_raw snd_seq_device snd_timer irda snd soundcore toshiba_bluetooth toshiba_haps crc_ccitt 8250_fintek tpm_infineon shpchp mac_hid parport_pc ppdev lp parport autofs4 psmouse firewire_ohci pata_acpi e100 sdhci_pci mii i915 sdhci firewire_core i2c_algo_bit crc_itu_t drm_kms_helper drm video
  [   54.763065] CPU: 1 PID: 968 Comm: Xorg Tainted: G        W      3.19.0-9-generic #9-Ubuntu
  [   54.763068] Hardware name: TOSHIBA Equium A100/MPAD-MSAE Customer Reference Boards, BIOS 2.10    10/23/2006
  [   54.763070]  ffffffffc02e2b70 ffff8800ba62b738 ffffffff817c09b5 0000000000000007
  [   54.763075]  ffff8800ba62b788 ffff8800ba62b778 ffffffff8107595a ffff8800ba62b758
  [   54.763079]  ffff880035480000 ffff880035fb2000 0000000000000000 ffff880035480000
  [   54.763083] Call Trace:
  [   54.763094]  [<ffffffff817c09b5>] dump_stack+0x45/0x57
  [   54.763099]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  [   54.763103]  [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
  [   54.763118]  [<ffffffffc02b5e80>] drm_wait_one_vblank+0x170/0x180 [drm]
  [   54.763155]  [<ffffffffc03c53af>] ? gen4_read32+0x4f/0xc0 [i915]
  [   54.763186]  [<ffffffffc0417955>] intel_enable_tv+0x25/0x60 [i915]
  [   54.763212]  [<ffffffffc03e2d1b>] i9xx_crtc_enable+0x3fb/0x4c0 [i915]
  [   54.763239]  [<ffffffffc03e12b2>] __intel_set_mode+0x882/0xc80 [i915]
  [   54.763266]  [<ffffffffc03e6dfd>] intel_set_mode+0x6d/0x90 [i915]
  [   54.763293]  [<ffffffffc03e7096>] intel_get_load_detect_pipe+0x276/0x600 [i915]
  [   54.763298]  [<ffffffff811989d0>] ? zone_statistics+0x80/0xa0
  [   54.763328]  [<ffffffffc0418555>] intel_tv_detect+0x135/0x670 [i915]
  [   54.763342]  [<ffffffffc0322b13>] drm_helper_probe_single_connector_modes_merge_bits+0x303/0x460 [drm_kms_helper]
  [   54.763350]  [<ffffffffc0322c83>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
  [   54.763369]  [<ffffffffc02c216f>] drm_mode_getconnector+0x43f/0x4b0 [drm]
  [   54.763383]  [<ffffffffc02b3adf>] drm_ioctl+0x1df/0x680 [drm]
  [   54.763390]  [<ffffffff812077b0>] do_vfs_ioctl+0x2e0/0x4e0
  [   54.763394]  [<ffffffff811f5755>] ? __sb_end_write+0x35/0x70
  [   54.763399]  [<ffffffff811f31c2>] ? vfs_write+0x1b2/0x1f0
  [   54.763403]  [<ffffffff81207a31>] SyS_ioctl+0x81/0xa0
  [   54.763407]  [<ffffffff817c7aed>] system_call_fastpath+0x16/0x1b
  [   54.763410] ---[ end trace 959064f9168f0b5b ]---

  repeats quite a few times during the boot.
  (3.19.0-9-generic #9-Ubuntu)
  Oldish Core2 laptop, internal LCD only running KDE.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-generic 3.19.0.9.8
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  ApportVersion: 2.16.2-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dg         2008 F.... pulseaudio
  Date: Sun Mar 15 17:49:05 2015
  HibernationDevice: RESUME=/dev/mapper/davros--vg-swap_1
  InstallationDate: Installed on 2013-11-15 (485 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131115)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: TOSHIBA Equium A100
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-9-generic root=/dev/mapper/hostname--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-9-generic N/A
   linux-backports-modules-3.19.0-9-generic  N/A
   linux-firmware                            1.143
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: yes
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-03-15 (0 days ago)
  dmi.bios.date: 10/23/2006
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 2.10
  dmi.board.name: MPAD-MSAE Customer Reference Boards
  dmi.board.vendor: Intel Corporation
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr2.10:bd10/23/2006:svnTOSHIBA:pnEquiumA100:pvrPSAABE-00J008EN:rvnIntelCorporation:rnMPAD-MSAECustomerReferenceBoards:rvrNotApplicable:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: Equium A100
  dmi.product.version: PSAABE-00J008EN
  dmi.sys.vendor: TOSHIBA

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