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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915: black screen with kms enabled on baytrail system"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96721">96721</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>i915: black screen with kms enabled on baytrail system
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sassmann@redhat.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=124776" name="attach_124776" title="dmesg-4.7-rc5-modeset-broken.txt">attachment 124776</a> <a href="attachment.cgi?id=124776&action=edit" title="dmesg-4.7-rc5-modeset-broken.txt">[details]</a></span>
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@wintab8 debug]# uname -m
i686
[root@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 ]---</pre>
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