Distribution: Debian unstable amd 64 Hardware Environment: IBM Thinkpad X40 (lspic output below) Software Environment: xorg 1.6 rc1 and intel 2.6.1 from debian experimental Problem Description: When loading the intel drm with modesetting on (X killed) # rmmod i915 && modprobe i915 modeset=1 the following BUG report gets dumped to dmesg (before firing up X): ===================================== [ BUG: bad unlock balance detected! ] ------------------------------------- modprobe/4547 is trying to release lock (&dev->mode_config.mutex) at: [<c02e02d4>] mutex_unlock+0xd/0xf but there are no more locks to release! other info that might help us debug this: no locks held by modprobe/4547. stack backtrace: Pid: 4547, comm: modprobe Not tainted 2.6.29-rc2-00442-g152a649 #24 Call Trace: [<c02df682>] ? printk+0x14/0x1a [<c013ebb0>] print_unlock_inbalance_bug+0xcc/0xd7 [<c02d0020>] ? xfrm_alloc_spi+0x10b/0x19e [<c0128a41>] ? process_timeout+0x0/0xf [<c02df682>] ? printk+0x14/0x1a [<c02e02d4>] ? mutex_unlock+0xd/0xf [<c013ee53>] lock_release+0x90/0x151 [<c02e0271>] __mutex_unlock_slowpath+0x9f/0xf5 [<c02e02d4>] mutex_unlock+0xd/0xf [<f8d1f9bb>] intel_lvds_get_modes+0x67/0x92 [i915] [<f8c7639c>] drm_helper_probe_single_connector_modes+0xb8/0x194 [drm] [<f8c764af>] drm_helper_probe_connector_modes+0x37/0x62 [drm] [<f8c764fc>] drm_helper_initial_config+0x22/0x154 [drm] [<f8d14ff4>] i915_driver_load+0x720/0x767 [i915] [<f8c6fc39>] drm_get_dev+0x2ee/0x383 [drm] [<f8c6b816>] drm_init+0x6b/0xa0 [drm] [<f8848000>] ? i915_init+0x0/0x48 [i915] [<f8848046>] i915_init+0x46/0x48 [i915] [<c0101151>] _stext+0x69/0x16d [<c02e02d4>] ? mutex_unlock+0xd/0xf [<c01c22f2>] ? sysfs_addrm_finish+0x1c/0x1d2 [<c013cf9d>] ? lock_release_holdtime+0x1a/0x178 [<c02e02d4>] ? mutex_unlock+0xd/0xf [<c02e02d4>] ? mutex_unlock+0xd/0xf [<c013d98f>] ? __lock_acquire+0x498/0x82f [<c013d98f>] ? __lock_acquire+0x498/0x82f [<c013e41f>] ? debug_check_no_locks_freed+0xeb/0xfe [<c013d98f>] ? __lock_acquire+0x498/0x82f [<c015a702>] ? tracepoint_update_probe_range+0x1f/0x8d [<c013cf9d>] ? lock_release_holdtime+0x1a/0x178 [<c02e02d4>] ? mutex_unlock+0xd/0xf [<c013cf9d>] ? lock_release_holdtime+0x1a/0x178 [<c01354b9>] ? __blocking_notifier_call_chain+0x45/0x51 [<c0134c5d>] ? up_read+0x1b/0x2e [<c01354b9>] ? __blocking_notifier_call_chain+0x45/0x51 [<c0145db1>] sys_init_module+0x8e/0x191 [<c0102e91>] sysenter_do_call+0x12/0x31 lspci -nn output on this box: 00:00.0 Host bridge [0600]: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller [8086:3580] (rev 02) 00:00.1 System peripheral [0880]: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller [8086:3584] (rev 02) 00:00.3 System peripheral [0880]: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller [8086:3585] (rev 02) 00:02.0 VGA compatible controller [0300]: Intel Corporation 82852/855GM Integrated Graphics Device [8086:3582] (rev 02) 00:02.1 Display controller [0380]: Intel Corporation 82852/855GM Integrated Graphics Device [8086:3582] (rev 02) 00:1d.0 USB Controller [0c03]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 [8086:24c2] (rev 01) 00:1d.1 USB Controller [0c03]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 [8086:24c4] (rev 01) 00:1d.2 USB Controller [0c03]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 [8086:24c7] (rev 01) 00:1d.7 USB Controller [0c03]: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller [8086:24cd] (rev 01) 00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev 81) 00:1f.0 ISA bridge [0601]: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge [8086:24cc] (rev 01) 00:1f.1 IDE interface [0101]: Intel Corporation 82801DBM (ICH4-M) IDE Controller [8086:24ca] (rev 01) 00:1f.3 SMBus [0c05]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller [8086:24c3] (rev 01) 00:1f.5 Multimedia audio controller [0401]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller [8086:24c5] (rev 01) 00:1f.6 Modem [0703]: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Controller [8086:24c6] (rev 01) 02:00.0 CardBus bridge [0607]: Ricoh Co Ltd RL5c476 II [1180:0476] (rev 8d) 02:00.1 SD Host controller [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter [1180:0822] (rev 13) 02:01.0 Ethernet controller [0200]: Intel Corporation 82541GI Gigabit Ethernet Controller [8086:1077] 02:02.0 Ethernet controller [0200]: Atheros Communications Inc. AR5212 802.11abg NIC [168c:1014] (rev 01) I'll paste the complete dmesg (including some other stuffed caused by X starting) shortly
Created attachment 20042 [details] complete dmesg Correction: Of course, it's a 32 bit box, not amd64 (I mixed that one up, sorry).
thanks, I merged a fix
Andrew, I have a problem with intelfb and X too. I'm using ubuntu jaunty (x.org 1.6rc1 and intel 2.6.1). When i enable CONFIG_DRM_I915_KMS=y it just boot fine but when i start kdm (or even startx) i just got a blank screen. A known solutation is to disable CONFIG_DRM_I915_KMS=y and removing any vga=xxx from grub. It's boots without framebuffer and them X/KDM starts fine.
sorry, i didn't give much details: 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) It's a GM45 board. (II) intel(0): Integrated Graphics Chipset: Intel(R) Mobile Intel® GM45 Express Chipset %s/solutation/solution/g Linux version 2.6.29-rc3 (alemao@dub) (gcc version 4.3.3 (Ubuntu 4.3.3-3ubuntu1) ) #11 SMP Fri Jan 30 19:34:29 BRST 2009