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Bug#757805: linux: linux-3.14.13/drivers/gpu/drm/i915/intel_panel.c:696 i9xx_enable_backlight+0xd4/0x100 [i915]()



2014-08-11 16:56 GMT+03:00 maximilian attems <maks@stro.at>:
> On Mon, Aug 11, 2014 at 04:30:01PM +0300, Martin-Éric Racine wrote:
>> Package: src:linux
>> Version: 3.14.13-2
>> Severity: normal
>> File: linux
>>
>> While debugging something else, I found the following in syslog:
>
> can you reproduce with latest 3.16 (should be in exp).

Yes, I can. See attached kernel oops dump.

Martin-Éric
Aug 11 17:31:52 suomi kernel: [    2.694959] [drm] Setting output timings on SDVOB failed
Aug 11 17:31:52 suomi kernel: [    2.804023] ------------[ cut here ]------------
Aug 11 17:31:52 suomi kernel: [    2.804100] WARNING: CPU: 0 PID: 64 at /build/linux-c_peJ_/linux-3.16/drivers/gpu/drm/i915/intel_panel.c:758 i9xx_enable_backlight+0xcc/0xf0 [i915]()
Aug 11 17:31:52 suomi kernel: [    2.804101] backlight already enabled
Aug 11 17:31:52 suomi kernel: [    2.804124] Modules linked in: dell_laptop rfkill dcdbas ata_piix(+) libata firewire_ohci ehci_pci uhci_hcd(+) ehci_hcd scsi_mod sdhci_pci sdhci mmc_core firewire_core crc_itu_t usbcore usb_common tg3 ptp pps_core libphy wmi i915(+) i2c_algo_bit video drm_kms_helper drm button i2c_core thermal thermal_sys
Aug 11 17:31:52 suomi kernel: [    2.804129] CPU: 0 PID: 64 Comm: systemd-udevd Not tainted 3.16-trunk-686-pae #1 Debian 3.16-1~exp1
Aug 11 17:31:52 suomi kernel: [    2.804131] Hardware name: Dell Inc. Latitude D430                   /000007, BIOS A01 06/20/2007
Aug 11 17:31:52 suomi kernel: [    2.804137]  00000009 c1443813 f356b870 c10530ae f8ad47be f356b888 00000040 f8ace010
Aug 11 17:31:52 suomi kernel: [    2.804143]  000002f6 f8aa5e2c f8aa5e2c f36c0000 f36ae800 f3660000 00000246 c1053103
Aug 11 17:31:52 suomi kernel: [    2.804148]  00000009 f356b870 f8ad47be f356b888 f8aa5e2c f8ace010 000002f6 f8ad47be
Aug 11 17:31:52 suomi kernel: [    2.804149] Call Trace:
Aug 11 17:31:52 suomi kernel: [    2.804159]  [<c1443813>] ? dump_stack+0x3e/0x4e
Aug 11 17:31:52 suomi kernel: [    2.804165]  [<c10530ae>] ? warn_slowpath_common+0x7e/0xa0
Aug 11 17:31:52 suomi kernel: [    2.804222]  [<f8aa5e2c>] ? i9xx_enable_backlight+0xcc/0xf0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804278]  [<f8aa5e2c>] ? i9xx_enable_backlight+0xcc/0xf0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804282]  [<c1053103>] ? warn_slowpath_fmt+0x33/0x40
Aug 11 17:31:52 suomi kernel: [    2.804338]  [<f8aa5e2c>] ? i9xx_enable_backlight+0xcc/0xf0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804396]  [<f8aa6f8f>] ? intel_panel_enable_backlight+0x6f/0xd0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804448]  [<f8a7d81d>] ? i9xx_crtc_enable+0x35d/0x3f0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804500]  [<f8a81883>] ? __intel_set_mode+0x713/0x1440 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804552]  [<f8a84b1d>] ? intel_set_mode+0x1d/0x40 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804604]  [<f8a85886>] ? intel_crtc_set_config+0x7d6/0xbb0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804609]  [<c1446b1c>] ? __ww_mutex_lock+0xc/0x6d
Aug 11 17:31:52 suomi kernel: [    2.804659]  [<f8a78c80>] ? intel_user_framebuffer_destroy+0xa0/0xa0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804674]  [<f888dd86>] ? drm_mode_set_config_internal+0x46/0xb0 [drm]
Aug 11 17:31:52 suomi kernel: [    2.804680]  [<f827352a>] ? restore_fbdev_mode+0x9a/0xc0 [drm_kms_helper]
Aug 11 17:31:52 suomi kernel: [    2.804686]  [<f8273565>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x15/0x30 [drm_kms_helper]
Aug 11 17:31:52 suomi kernel: [    2.804691]  [<f8274e4e>] ? drm_fb_helper_set_par+0x1e/0x60 [drm_kms_helper]
Aug 11 17:31:52 suomi kernel: [    2.804696]  [<c128735a>] ? fbcon_init+0x46a/0x4b0
Aug 11 17:31:52 suomi kernel: [    2.804701]  [<c12eed56>] ? visual_init+0x96/0xf0
Aug 11 17:31:52 suomi kernel: [    2.804705]  [<c12f0d54>] ? do_bind_con_driver+0x104/0x2d0
Aug 11 17:31:52 suomi kernel: [    2.804709]  [<c12f1406>] ? do_take_over_console+0xf6/0x190
Aug 11 17:31:52 suomi kernel: [    2.804712]  [<c1287df4>] ? fbcon_event_notify+0x6f4/0x740
Aug 11 17:31:52 suomi kernel: [    2.804717]  [<c1282c27>] ? do_fbcon_takeover+0x57/0xc0
Aug 11 17:31:52 suomi kernel: [    2.804721]  [<c1072666>] ? notifier_call_chain+0x46/0x60
Aug 11 17:31:52 suomi kernel: [    2.804725]  [<c1072907>] ? __blocking_notifier_call_chain+0x37/0x50
Aug 11 17:31:52 suomi kernel: [    2.804728]  [<c1072937>] ? blocking_notifier_call_chain+0x17/0x20
Aug 11 17:31:52 suomi kernel: [    2.804733]  [<c128e8eb>] ? register_framebuffer+0x1bb/0x2d0
Aug 11 17:31:52 suomi kernel: [    2.804739]  [<f827515d>] ? drm_fb_helper_initial_config+0x2cd/0x1170 [drm_kms_helper]
Aug 11 17:31:52 suomi kernel: [    2.804788]  [<f8a6c860>] ? gen4_write32+0x30/0xc0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804835]  [<f8a6c7b6>] ? gen4_read32+0x36/0xb0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804888]  [<f8a8fcff>] ? intel_fbdev_init+0x1af/0x530 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804935]  [<f8a5e0bf>] ? i915_hpd_irq_setup+0xaf/0xc0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.804994]  [<f8ab0337>] ? i915_driver_load+0xf17/0xfa0 [i915]
Aug 11 17:31:52 suomi kernel: [    2.805051]  [<f8aad2c0>] ? i915_switcheroo_set_state+0x80/0x80 [i915]
Aug 11 17:31:52 suomi kernel: [    2.805057]  [<c123291a>] ? kobject_uevent_env+0x15a/0x690
Aug 11 17:31:52 suomi kernel: [    2.805061]  [<c1232550>] ? cleanup_uevent_env+0x10/0x10
Aug 11 17:31:52 suomi kernel: [    2.805066]  [<c131415c>] ? get_device+0xc/0x20
Aug 11 17:31:52 suomi kernel: [    2.805071]  [<c143d8bb>] ? klist_node_init+0x2b/0x40
Aug 11 17:31:52 suomi kernel: [    2.805075]  [<c143d926>] ? klist_add_tail+0x16/0x30
Aug 11 17:31:52 suomi kernel: [    2.805079]  [<c13153f6>] ? device_add+0x1d6/0x5a0
Aug 11 17:31:52 suomi kernel: [    2.805092]  [<f888c252>] ? drm_sysfs_device_add+0xb2/0xf0 [drm]
Aug 11 17:31:52 suomi kernel: [    2.805104]  [<f888903b>] ? drm_minor_register+0x11b/0x1a0 [drm]
Aug 11 17:31:52 suomi kernel: [    2.805115]  [<f8889146>] ? drm_dev_register+0x86/0xd0 [drm]
Aug 11 17:31:52 suomi kernel: [    2.805126]  [<f888b562>] ? drm_get_pci_dev+0x72/0x1b0 [drm]
Aug 11 17:31:52 suomi kernel: [    2.805132]  [<c1264b85>] ? pci_device_probe+0x65/0xc0
Aug 11 17:31:52 suomi kernel: [    2.805138]  [<c11b141d>] ? sysfs_create_link+0x1d/0x40
Aug 11 17:31:52 suomi kernel: [    2.805142]  [<c1317c0e>] ? driver_probe_device+0x8e/0x3a0
Aug 11 17:31:52 suomi kernel: [    2.805145]  [<c14459eb>] ? schedule_preempt_disabled+0x1b/0x60
Aug 11 17:31:52 suomi kernel: [    2.805148]  [<c1446ec5>] ? __mutex_lock_slowpath+0xb5/0x175
Aug 11 17:31:52 suomi kernel: [    2.805152]  [<c1317f50>] ? __device_attach+0x30/0x30
Aug 11 17:31:52 suomi kernel: [    2.805155]  [<c1317fc1>] ? __driver_attach+0x71/0x80
Aug 11 17:31:52 suomi kernel: [    2.805160]  [<c131628f>] ? bus_for_each_dev+0x3f/0x70
Aug 11 17:31:52 suomi kernel: [    2.805164]  [<c1317746>] ? driver_attach+0x16/0x20
Aug 11 17:31:52 suomi kernel: [    2.805166]  [<c1317f50>] ? __device_attach+0x30/0x30
Aug 11 17:31:52 suomi kernel: [    2.805170]  [<c13173cf>] ? bus_add_driver+0x14f/0x230
Aug 11 17:31:52 suomi kernel: [    2.805175]  [<c12322e5>] ? kset_find_obj+0x25/0x70
Aug 11 17:31:52 suomi kernel: [    2.805179]  [<f878d000>] ? 0xf878cfff
Aug 11 17:31:52 suomi kernel: [    2.805182]  [<c1318611>] ? driver_register+0x51/0xd0
Aug 11 17:31:52 suomi kernel: [    2.805186]  [<c1002122>] ? do_one_initcall+0xc2/0x1f0
Aug 11 17:31:52 suomi kernel: [    2.805190]  [<f878d000>] ? 0xf878cfff
Aug 11 17:31:52 suomi kernel: [    2.805195]  [<c1133f0c>] ? free_vmap_area_noflush+0x1c/0x60
Aug 11 17:31:52 suomi kernel: [    2.805198]  [<c11355a0>] ? __vunmap+0x80/0xe0
Aug 11 17:31:52 suomi kernel: [    2.805203]  [<c10b9664>] ? load_module+0x1c74/0x2350
Aug 11 17:31:52 suomi kernel: [    2.805212]  [<c10b9ea5>] ? SyS_finit_module+0x75/0xc0
Aug 11 17:31:52 suomi kernel: [    2.805217]  [<c11c6a05>] ? security_mmap_file+0x25/0x70
Aug 11 17:31:52 suomi kernel: [    2.805228]  [<f89ffd8c>] ? ata_qc_new_init+0x15c/0x1a0 [libata]
Aug 11 17:31:52 suomi kernel: [    2.805232]  [<c1448449>] ? syscall_call+0x7/0x7
Aug 11 17:31:52 suomi kernel: [    2.805235] ---[ end trace 97cf480beecb3c3a ]---

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