I see lots of warning like this with 3.11-rc5 on my thinkpad t40.
[197481.739272] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.flags (expected 1, found 0) [197481.739283] ------------[ cut here ]------------ [197481.739352] WARNING: CPU: 0 PID: 556 at drivers/gpu/drm/i915/intel_display.c:8286 check_crtc_state+0x5cf/0xa50 [i915]() [197481.739355] pipe state doesn't match! [197481.739358] Modules linked in: fuse ebtable_nat xt_CHECKSUM nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 bridge nf_defrag_ipv6 stp llc iptable_nat nf_nat_ipv4 nf_nat be2iscsi iscsi_boot_sysfs iptable_mangle bnx2i nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack lockd nf_conntrack sunrpc cnic ebtable_filter uio cxgb4i cxgb4 ebtables ip6table_filter ip6_tables cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp rfcomm libiscsi scsi_transport_iscsi bnep arc4 iwldvm mac80211 btusb snd_hda_codec_hdmi iwlwifi snd_hda_codec_conexant snd_hda_intel snd_hda_codec bluetooth vhost_net cfg80211 tun macvtap macvlan iTCO_wdt uvcvideo iTCO_vendor_support snd_usb_audio vhost snd_usbmidi_lib videobuf2_vmalloc [197481.739440] snd_hwdep kvm_intel videobuf2_memops videobuf2_core videodev snd_rawmidi thinkpad_acpi e1000e kvm snd_seq rfkill i2c_i801 snd_seq_device snd_pcm snd_page_alloc snd_timer pcspkr lpc_ich mfd_core snd ptp tpm_tis pps_core wmi soundcore tpm tpm_bios binfmt_misc uinput i915 firewire_ohci firewire_core crc_itu_t i2c_algo_bit drm_kms_helper sdhci_pci sdhci drm mmc_core i2c_core video [197481.739492] CPU: 0 PID: 556 Comm: X Tainted: G W 3.11.0-rc5-mst #253 [197481.739497] Hardware name: LENOVO 4243BQ9/4243BQ9, BIOS 8AET57WW (1.37 ) 04/05/2012 [197481.739501] 000000000000205e ffff88020be47828 ffffffff81672e9d ffff88020be47868 [197481.739509] ffffffff8105c52c 0000000000000000 ffff88021270fc70 ffff88021241d000 [197481.739516] 0000000000000001 ffff88021270fc78 ffff88021270f800 ffff88020be47948 [197481.739523] Call Trace: [197481.739537] [<ffffffff81672e9d>] dump_stack+0x6a/0x7d [197481.739547] [<ffffffff8105c52c>] warn_slowpath_common+0x8c/0xc0 [197481.739555] [<ffffffff8105c65e>] warn_slowpath_fmt+0x6e/0x70 [197481.739589] [<ffffffffa00c9385>] ? i915_read32+0x75/0x130 [i915] [197481.739617] [<ffffffffa00c9385>] ? i915_read32+0x75/0x130 [i915] [197481.739657] [<ffffffffa0104315>] ? intel_lvds_get_config+0x45/0xb0 [i915] [197481.739692] [<ffffffffa00f377f>] check_crtc_state+0x5cf/0xa50 [i915] [197481.739730] [<ffffffffa00faa85>] intel_modeset_check_state+0x2e5/0x7c0 [i915] [197481.739758] [<ffffffffa00c8eeb>] ? i915_write32+0xdb/0x140 [i915] [197481.739792] [<ffffffffa0103f7c>] intel_crt_dpms+0x8c/0xd0 [i915] [197481.739826] [<ffffffffa0057643>] drm_mode_obj_set_property_ioctl+0x393/0x3b0 [drm] [197481.739854] [<ffffffffa0057692>] drm_mode_connector_property_set_ioctl+0x32/0x40 [drm] [197481.739880] [<ffffffffa004964a>] drm_ioctl+0x3da/0x660 [drm] [197481.739893] [<ffffffff81142695>] ? __free_pages+0x45/0x50 [197481.739923] [<ffffffffa0057660>] ? drm_mode_obj_set_property_ioctl+0x3b0/0x3b0 [drm] [197481.739933] [<ffffffff8129ecda>] ? file_has_perm+0xaa/0xb0 [197481.739977] [<ffffffffa0130b75>] i915_compat_ioctl+0x45/0x50 [i915] [197481.739985] [<ffffffff811ee9f6>] compat_sys_ioctl+0x106/0x13a0 [197481.739994] [<ffffffff8119dce9>] ? file_sb_list_del+0x49/0x50 [197481.740001] [<ffffffff8107bd35>] ? task_work_add+0x55/0x70 [197481.740008] [<ffffffff8119de15>] ? fput+0x75/0xb0 [197481.740017] [<ffffffff810e3c2b>] ? __audit_syscall_exit+0x23b/0x2e0 [197481.740027] [<ffffffff8168221c>] sysenter_dispatch+0x7/0x21 [197481.740031] ---[ end trace 60b3bfa00b791b28 ]---
The graphics card is: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Anyone interested in debugging the source of these warnings?