Package: src:linux Version: 6.12.25-1 Severity: critical Justification: breaks the whole system X-Debbugs-Cc: debian-am...@lists.debian.org User: debian-am...@lists.debian.org Usertags: amd64
This is weird and may be related to #1104744 involving grub. After installing linux-image-6.12.25-amd64 and noticing some messages scroll past too fast to read mentioning UEFI (this system does not use UEFI), the next attempt to boot produced irrelevant and confusing multiple messages from the BIOS without any options to reset the BIOS configuration and permit recovery. Eventually I managed to get back to a BIOS menu using a devuan recovery usbstick. I was then able to access the BIOS again, and discovered that some UEFI settings had been turned on which had rendered the system unusable. Eventually I was able to turn off the UEFI trouble and restore proper booting. Later, I discovered that the BIOS RTC had been reset with the *month* reduced by 1; ie set to April, not May!! But whatever, it is surely unacceptable to modify BIOS settings at all, and certainly not without explicit permisiion. Obviously, my initial thoughts were that the system had been hacked. The BIOS had been set up to allow a secondary boot from a USBstick. If that had not been enabled, I am not sure that I would have been able to recover. I suspect that I would have needed to physically remove the SSD and possibly more. A very stressful experience.... -- Package-specific info: ** Version: Linux version 6.12.25-amd64 (debian-ker...@lists.debian.org) (x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Debian 6.12.25-1 (2025-04-25) ** Command line: BOOT_IMAGE=/boot/vmlinuz-6.12.25-amd64 root=UUID=5b8060f7-f126-4534-a051-db5d205bd315 ro ** Not tainted ** Kernel log: Unable to read kernel log; any relevant messages should be attached ** Model information sys_vendor: Notebook product_name: W54_55SU1,SUW product_version: Not Applicable chassis_vendor: Notebook chassis_version: N/A bios_vendor: American Megatrends Inc. bios_version: 4.6.5 board_vendor: Notebook board_name: W54_55SU1,SUW board_version: Not Applicable ** Configuration for modprobe: blacklist arkfb blacklist aty128fb blacklist atyfb blacklist radeonfb blacklist cirrusfb blacklist cyber2000fb blacklist kyrofb blacklist matroxfb_base blacklist mb862xxfb blacklist neofb blacklist pm2fb blacklist pm3fb blacklist s3fb blacklist savagefb blacklist sisfb blacklist tdfxfb blacklist tridentfb blacklist vt8623fb blacklist microcode options snd_pcsp index=-2 options cx88_alsa index=-2 options snd_atiixp_modem index=-2 options snd_intel8x0m index=-2 options snd_via82xx_modem index=-2 options cirrus modeset=1 options mgag200 modeset=1 options snd_hda_intel id=[HDMI,PCH] index=1,0 options bonding max_bonds=0 options dummy numdummies=0 options ifb numifbs=0 ** Loaded modules: xt_recent ipt_REJECT nf_reject_ipv4 xt_comment xt_hashlimit xt_addrtype xt_mark xt_NFLOG nfnetlink_log xt_LOG nf_log_syslog nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_pptp nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp xt_tcpudp xt_conntrack nft_compat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 uas usb_storage nf_tables libcrc32c qrtr tun uinput binfmt_misc pktcdvd btusb uvcvideo btrtl btintel videobuf2_vmalloc uvc btbcm videobuf2_memops videobuf2_v4l2 btmtk snd_hda_codec_hdmi bluetooth videodev nfsd videobuf2_common mc intel_rapl_msr auth_rpcgss intel_rapl_common x86_pkg_temp_thermal nfs_acl intel_powerclamp lockd coretemp i915 grace iwlmvm kvm_intel sunrpc kvm mac80211 cpufreq_ondemand snd_hda_codec_realtek irqbypass crct10dif_pclmul crc32_pclmul snd_hda_codec_generic ghash_clmulni_intel rtsx_pci_sdmmc sha512_ssse3 libarc4 snd_hda_scodec_component drm_buddy sha256_ssse3 snd_hda_intel drm_display_helper mmc_core at24 sha1_ssse3 iTCO_wdt mei_pxp mei_hdcp iwlwifi snd_intel_dspcfg intel_pmc_bxt r8169 iTCO_vendor_support aesni_intel snd_intel_sdw_acpi watchdog cec gf128mul snd_hda_codec crypto_simd cryptd realtek rc_core rapl sr_mod mdio_devres xhci_pci intel_cstate snd_hda_core ttm i2c_i801 cfg80211 ehci_pci intel_uncore cdrom libphy xhci_hcd rtsx_pci pcspkr i2c_smbus snd_hwdep drm_kms_helper snd_pcm ehci_hcd i2c_algo_bit video snd_timer usbcore mei_me snd mei battery wmi rfkill lpc_ich button ac soundcore usb_common sg joydev drm msr parport_pc ppdev lp parport configfs efi_pstore nfnetlink ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic sd_mod ahci libahci libata scsi_mod psmouse evdev serio_raw crc32c_intel scsi_common ** PCI devices: 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller [8086:0c04] (rev 06) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort+ <MAbort+ >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> Kernel modules: ie31200_edac 00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 34 Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M] Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at f000 [size=64] Expansion ROM at 000c0000 [virtual] [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 00:03.0 Audio device [0403]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 35 Region 0: Memory at f7e14000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 05) (prog-if 30 [XHCI]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 30 Region 0: Memory at f7e00000 (64-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: xhci_hcd Kernel modules: xhci_pci 00:16.0 Communication controller [0780]: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 [8086:8c3a] (rev 04) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 28 Region 0: Memory at f7e1e000 (64-bit, non-prefetchable) [size=16] Capabilities: <access denied> Kernel driver in use: mei_me Kernel modules: mei_me 00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 05) (prog-if 20 [EHCI]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 16 Region 0: Memory at f7e1c000 (32-bit, non-prefetchable) [size=1K] Capabilities: <access denied> Kernel driver in use: ehci-pci Kernel modules: ehci_pci 00:1b.0 Audio device [0403]: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller [8086:8c20] (rev 05) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 32 Region 0: Memory at f7e10000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 [8086:8c10] (rev d5) (prog-if 00 [Normal decode]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 24 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 2000-2fff [size=4K] [16-bit] Memory behind bridge: df200000-df3fffff [size=2M] [32-bit] Prefetchable memory behind bridge: df400000-df5fffff [size=2M] [32-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1c.2 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 [8086:8c14] (rev d5) (prog-if 00 [Normal decode]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin C routed to IRQ 25 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 I/O behind bridge: [disabled] [16-bit] Memory behind bridge: f7d00000-f7dfffff [size=1M] [32-bit] Prefetchable memory behind bridge: [disabled] [64-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1c.3 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 [8086:8c16] (rev d5) (prog-if 00 [Normal decode]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin D routed to IRQ 26 Bus: primary=00, secondary=03, subordinate=03, sec-latency=0 I/O behind bridge: e000-efff [size=4K] [16-bit] Memory behind bridge: f7c00000-f7cfffff [size=1M] [32-bit] Prefetchable memory behind bridge: [disabled] [64-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 05) (prog-if 20 [EHCI]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 23 Region 0: Memory at f7e1b000 (32-bit, non-prefetchable) [size=1K] Capabilities: <access denied> Kernel driver in use: ehci-pci Kernel modules: ehci_pci 00:1f.0 ISA bridge [0601]: Intel Corporation HM86 Express LPC Controller [8086:8c49] (rev 05) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> Kernel driver in use: lpc_ich Kernel modules: lpc_ich 00:1f.2 SATA controller [0106]: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] [8086:8c03] (rev 05) (prog-if 01 [AHCI 1.0]) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 27 Region 0: I/O ports at f0b0 [size=8] Region 1: I/O ports at f0a0 [size=4] Region 2: I/O ports at f090 [size=8] Region 3: I/O ports at f080 [size=4] Region 4: I/O ports at f060 [size=32] Region 5: Memory at f7e1a000 (32-bit, non-prefetchable) [size=2K] Capabilities: <access denied> Kernel driver in use: ahci Kernel modules: ahci 00:1f.3 SMBus [0c05]: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller [8086:8c22] (rev 05) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin C routed to IRQ 18 Region 0: Memory at f7e19000 (64-bit, non-prefetchable) [size=256] Region 4: I/O ports at f040 [size=32] Kernel driver in use: i801_smbus Kernel modules: i2c_i801 02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73) Subsystem: Intel Corporation Wireless-N 7260 [Wilkins Peak 2] [8086:4062] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 33 Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi Kernel modules: iwlwifi 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTL8411B PCI Express Card Reader [10ec:5287] (rev 01) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin B routed to IRQ 29 Region 0: Memory at f7c15000 (32-bit, non-prefetchable) [size=4K] Expansion ROM at f7c00000 [disabled] [size=64K] Capabilities: <access denied> Kernel driver in use: rtsx_pci Kernel modules: rtsx_pci 03:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12) Subsystem: CLEVO/KAPOK Computer Device [1558:5455] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 19 Region 0: I/O ports at e000 [size=256] Region 2: Memory at f7c14000 (64-bit, non-prefetchable) [size=4K] Region 4: Memory at f7c10000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: r8169 Kernel modules: r8169 ** USB devices: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 8087:07dc Intel Corp. Bluetooth wireless interface Bus 003 Device 003: ID 5986:0248 Bison Electronics Inc. BisonCam, NB Pro Bus 003 Device 004: ID 0951:1666 Kingston Technology DataTraveler 100 G3/G4/SE9 G2/50 Kyson Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub -- System Information: Debian Release: trixie/sid APT prefers testing-debug APT policy: (500, 'testing-debug'), (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.12.25-amd64 (SMP w/8 CPU threads; PREEMPT) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) Versions of packages linux-image-6.12.25-amd64 depends on: ii initramfs-tools [linux-initramfs-tool] 0.147 ii kmod 34.2-2 ii linux-base 4.11 Versions of packages linux-image-6.12.25-amd64 recommends: pn apparmor <none> Versions of packages linux-image-6.12.25-amd64 suggests: ii debian-kernel-handbook 1.0.21 ii firmware-linux-free 20241210-2 ii grub-pc 2.12-7 pn linux-doc-6.12 <none> Versions of packages linux-image-6.12.25-amd64 is related to: ii firmware-amd-graphics 20250410-2 pn firmware-atheros <none> pn firmware-bnx2 <none> pn firmware-bnx2x <none> pn firmware-brcm80211 <none> pn firmware-cavium <none> pn firmware-cirrus <none> ii firmware-intel-graphics 20250410-2 ii firmware-intel-misc 20250410-2 pn firmware-intel-sound <none> pn firmware-ipw2x00 <none> pn firmware-ivtv <none> ii firmware-iwlwifi 20250410-2 pn firmware-libertas <none> pn firmware-marvell-prestera <none> pn firmware-mediatek <none> ii firmware-misc-nonfree 20250410-2 pn firmware-myricom <none> pn firmware-netronome <none> pn firmware-netxen <none> pn firmware-nvidia-graphics <none> pn firmware-qcom-soc <none> pn firmware-qlogic <none> ii firmware-realtek 20250410-2 pn firmware-samsung <none> pn firmware-siano <none> pn firmware-ti-connectivity <none> pn xen-hypervisor <none> -- no debconf information