[Bug 96721] New: i915: black screen with kms enabled on baytrail system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96721

            Bug ID: 96721
           Summary: i915: black screen with kms enabled on baytrail system
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sassmann at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124776
  --> https://bugs.freedesktop.org/attachment.cgi?id=124776&action=edit
dmesg-4.7-rc5-modeset-broken.txt

When booting with nomodeset X gets displayed correctly, with KMS enabled the
screen stays black. Fedora 24.

[root at wintab8 debug]# uname -m
i686
[root at wintab8 debug]# uname -r
4.7.0-rc5+

[    8.685785] [drm:pwm_setup_backlight [i915]] *ERROR* Failed to own the pwm
chip
[...]
[   10.646434] WARNING: CPU: 3 PID: 96 at
drivers/gpu/drm/i915/intel_display.c:13556 intel_atomic_commit+0x11e2/0x12a0
[i915]
[   10.646438] pipe A vblank wait timed out
[   10.646481] Modules linked in: mmc_block crc32c_intel i915 i2c_algo_bit
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm fjes video
i2c_hid sdhci_acpi sdhci mmc_core
[   10.646494] CPU: 3 PID: 96 Comm: kworker/3:2 Not tainted 4.7.0-rc5+ #5
[   10.646499] Hardware name: AXDIA International GmbH Wintab Gen 8/Type2 -
Board Product Name, BIOS AD890.1.02.022 09/25/2014
[   10.646545] Workqueue: events output_poll_execute [drm_kms_helper]
[   10.646568]  c0dd5967 ac3bedee 00000286 e4555d38 c0742137 e4555d7c f87810e4
e4555d68
[   10.646588]  c0461cba f87848b0 e4555d9c 00000060 f87810e4 000034f4 f870d4b2
000034f4
[   10.646607]  00000000 00000000 00000000 e4555d88 c0461d26 00000009 00000000
e4555d7c
[   10.646609] Call Trace:
[   10.646632]  [<c0742137>] dump_stack+0x58/0x81
[   10.646648]  [<c0461cba>] __warn+0xea/0x110
[   10.646899]  [<f870d4b2>] ? intel_atomic_commit+0x11e2/0x12a0 [i915]
[   10.646913]  [<c0461d26>] warn_slowpath_fmt+0x46/0x60
[   10.647162]  [<f870d4b2>] intel_atomic_commit+0x11e2/0x12a0 [i915]
[   10.647178]  [<c04a0df0>] ? prepare_to_wait_event+0xd0/0xd0
[   10.647283]  [<f84ee232>] drm_atomic_commit+0x32/0x60 [drm]
[   10.647331]  [<f84839e3>] restore_fbdev_mode+0x263/0x290 [drm_kms_helper]
[   10.647431]  [<f84ecd94>] ? drm_modeset_lock_all_ctx+0xa4/0xb0 [drm]
[   10.647480]  [<f8485c57>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x27/0x70 [drm_kms_helper]
[   10.647527]  [<f8485ccd>] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
[   10.647574]  [<f8485bdc>] drm_fb_helper_hotplug_event+0xcc/0x120
[drm_kms_helper]
[   10.647823]  [<f872820a>] intel_fbdev_output_poll_changed+0x1a/0x20 [i915]
[   10.647863]  [<f8478701>] drm_kms_helper_hotplug_event+0x21/0x30
[drm_kms_helper]
[   10.647903]  [<f84788f8>] output_poll_execute+0x188/0x1c0 [drm_kms_helper]
[   10.647919]  [<c0478b5f>] process_one_work+0x13f/0x3a0
[   10.647932]  [<c0478df9>] worker_thread+0x39/0x460
[   10.647944]  [<c0478dc0>] ? process_one_work+0x3a0/0x3a0
[   10.647954]  [<c047de26>] kthread+0xa6/0xc0
[   10.647970]  [<c0b0cda2>] ret_from_kernel_thread+0xe/0x24
[   10.647980]  [<c047dd80>] ? kthread_worker_fn+0x140/0x140
[   10.648064] ---[ end trace 2526b8c9602ba815 ]---

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