Hi, when upgrading to the most recent kernel from http://ftp5.gwdg.de/pub/ opensuse/update/13.1/src/kernel-source-3.12.53-40.1.src.rpm and http:// ftp5.gwdg.de/pub/opensuse/update/13.1/nosrc/kernel-desktop-3.12.53-40.1.nosrc.rpm on OpenSUSE 13.1 I observe the following warning from i915 driver: Mär 16 09:35:12 rt-ccs7520 kernel: ------------[ cut here ]------------ Mär 16 09:35:12 rt-ccs7520 kernel: WARNING: CPU: 0 PID: 90 at ../drivers/gpu/ drm/i915/intel_panel.c:632 i9xx_enable_backlight+0xdc/0x100 [i915]() Mär 16 09:35:12 rt-ccs7520 kernel: backlight already enabled Mär 16 09:35:12 rt-ccs7520 kernel: Modules linked in: i2c_i801(+) lpc_ich(+) ata_piix(+) mfd_core tg3 libphy ptp i915(+) pps_core drm_kms_helper drm i2c_algo_bit shpchp button video processor thermal_sys Mär 16 09:35:12 rt-ccs7520 kernel: CPU: 0 PID: 90 Comm: udevd Not tainted 3.12.53-40.2-ccs #1 Mär 16 09:35:12 rt-ccs7520 kernel: Hardware name: National Instruments NI PXI-8190 Series Embedded Controller /NI PXI-8190 Series Embedded Controller , BIOS 1.3.2 03/24/2011 Mär 16 09:35:12 rt-ccs7520 kernel: f7d25318 c074fb28 00000000 c0247088 f7d2c021 f6cab85c 0000005a f7d25318 Mär 16 09:35:12 rt-ccs7520 kernel: 00000278 f7cf545c f7cf545c f6d08000 f6d5c000 f6d02000 00000292 c02470f3 Mär 16 09:35:12 rt-ccs7520 kernel: 00000009 f6cab844 f7d2c021 f6cab85c f7cf545c f7d25318 00000278 f7d2c021 Mär 16 09:35:12 rt-ccs7520 kernel: Call Trace: Mär 16 09:35:12 rt-ccs7520 kernel: [<c0205209>] try_stack_unwind+0x179/0x190 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02041d7>] dump_trace+0x47/0xf0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c020525f>] show_trace_log_lvl+0x3f/0x50 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02042d0>] show_stack_log_lvl+0x50/0xd0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02052af>] show_stack+0x1f/0x40 Mär 16 09:35:12 rt-ccs7520 kernel: [<c074fb28>] dump_stack+0x48/0x76 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0247088>] warn_slowpath_common +0x88/0xc0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02470f3>] warn_slowpath_fmt+0x33/0x40 Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cf545c>] i9xx_enable_backlight+0xdc/ 0x100 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cf655c>] intel_panel_enable_backlight +0x9c/0xe0 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cd4440>] i9xx_crtc_enable+0x260/0x2f0 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cda8bc>] __intel_set_mode+0x77c/0x8d0 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cdd7bd>] intel_set_mode+0x1d/0x40 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7cde04f>] intel_crtc_set_config+0x77f/ 0x960 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7b40263>] drm_mode_set_config_internal +0x43/0xb0 [drm] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7b1a2f5>] drm_fb_helper_set_par +0x45/0xb0 [drm_kms_helper] Mär 16 09:35:12 rt-ccs7520 kernel: [<c04f8eb2>] fbcon_init+0x482/0x4d0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c055e1e6>] visual_init+0x96/0xf0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0560634>] do_bind_con_driver +0x104/0x2d0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0560cd6>] do_take_over_console +0xf6/0x190 Mär 16 09:35:12 rt-ccs7520 kernel: [<c04f4777>] do_fbcon_takeover+0x57/0xc0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0759346>] notifier_call_chain+0x46/0x60 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0269897>] __blocking_notifier_call_chain +0x37/0x50 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02698c7>] blocking_notifier_call_chain +0x17/0x20 Mär 16 09:35:12 rt-ccs7520 kernel: [<c04ec78b>] register_framebuffer+0x1bb/ 0x2d0 Mär 16 09:35:12 rt-ccs7520 kernel: [<f7b1a005>] drm_fb_helper_initial_config +0x2e5/0x490 [drm_kms_helper] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7caae99>] i915_driver_load+0xfb9/0xfe0 [i915] Mär 16 09:35:12 rt-ccs7520 kernel: [<f7b3cbc3>] drm_get_pci_dev+0x103/0x2a0 [drm] Mär 16 09:35:12 rt-ccs7520 kernel: [<c04d02b5>] local_pci_probe+0x25/0x50 Mär 16 09:35:12 rt-ccs7520 kernel: [<c04d137f>] pci_device_probe+0xcf/0xe0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c05862ee>] driver_probe_device+0x7e/ 0x3a0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c05866b1>] __driver_attach+0x71/0x80 Mär 16 09:35:12 rt-ccs7520 kernel: [<c05847ef>] bus_for_each_dev+0x3f/0x70 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0585e06>] driver_attach+0x16/0x20 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0585a1f>] bus_add_driver+0x1cf/0x2b0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c0586bf1>] driver_register+0x51/0xd0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c020042a>] do_one_initcall+0xca/0x190 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02b219b>] load_module+0x1d5b/0x2460 Mär 16 09:35:12 rt-ccs7520 kernel: [<c02b2a05>] SyS_finit_module+0x75/0xc0 Mär 16 09:35:12 rt-ccs7520 kernel: [<c075c37d>] sysenter_do_call+0x12/0x12 Mär 16 09:35:12 rt-ccs7520 kernel: [<b76fa428>] 0xb76fa427 Mär 16 09:35:12 rt-ccs7520 kernel: ---[ end trace 84f8674cd360f232 ]--- Mär 16 09:35:12 rt-ccs7520 kernel: Console: switching to colour frame buffer device 128x48 Mär 16 09:35:12 rt-ccs7520 kernel: i915 0000:00:02.0: fb0: inteldrmfb frame buffer device Mär 16 09:35:12 rt-ccs7520 kernel: i915 0000:00:02.0: registered panic notifier Mär 16 09:35:12 rt-ccs7520 kernel: [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 This issue got newly introduced and is not present in previous openSUSE kernels. # lspci -d 8086:2592 -v 00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04) (prog-if 00 [VGA controller]) Subsystem: Intel Corporation Device 1999 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at a0080000 (32-bit, non-prefetchable) [size=512K] I/O ports at 1800 [size=8] Memory at c0000000 (32-bit, prefetchable) [size=256M] Memory at a0000000 (32-bit, non-prefetchable) [size=256K] Expansion ROM at <unassigned> [disabled] Capabilities: [d0] Power Management version 2 Kernel driver in use: i915 Kernel modules: i915 # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 2.00GHz stepping : 8 microcode : 0x20 cpu MHz : 2000.000 cache size : 2048 KB fdiv_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx bts est tm2 bogomips : 3990.16 clflush size : 64 cache_alignment : 64 address sizes : 32 bits physical, 32 bits virtual power management: This is an embedded system running a venerable mobile CPU with only a single external VGA. Regards --martin konold -- Dipl.-Physiker Martin Konold e r f r a k o n Erlewein, Frank, Konold & Partner - Beratende Ingenieure und Physiker Registergericht: Amtsgericht Stuttgart PR 126 Firmensitz: Adolfstraße 23, 70469 Stuttgart fon: 0711 67400963 fax: 0711 67400959 email: martin.konold@erfrakon.de http://www.erfrakon.de -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org