Just updated my server with todays updates. In addition to the X problem (Solved by http://www.redhat.com/archives/fedora-test-list/2006-February/msg00179.html) the new kernel seems not to find all of my multiple serial ports. Also two port numbers are different, which is also bad: /var/log/messages of 2.6.15 boot: kernel: Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled kernel: serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A kernel: serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A kernel: 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A kernel: 00:0a: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A kernel: ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11 kernel: PCI: setting IRQ 11 as level-triggered kernel: ACPI: PCI Interrupt 0000:02:0e.0[A] -> Link [LNKC] -> GSI 11 (level, low) -> IRQ 11 kernel: 0000:02:0e.0: ttyS2 at I/O 0xa800 (irq = 11) is a 16550A kernel: 0000:02:0e.0: ttyS3 at I/O 0xa400 (irq = 11) is a 16550A Older 2.6.14 kernel: kernel: Serial: 8250/16550 driver $Revision: 1.90 $ 32 ports, IRQ sharing enabled kernel: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A kernel: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A kernel: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A kernel: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A kernel: ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11 kernel: PCI: setting IRQ 11 as level-triggered kernel: ACPI: PCI Interrupt 0000:02:0e.0[A] -> Link [LNKC] -> GSI 11 (level, low) -> IRQ 11 kernel: ttyS4 at I/O 0xa800 (irq = 11) is a 16550A kernel: ttyS5 at I/O 0xa400 (irq = 11) is a 16550A kernel: ACPI: PCI Interrupt 0000:02:0e.1[A] -> Link [LNKC] -> GSI 11 (level, low) -> IRQ 11 kernel: ttyS6 at I/O 0xa000 (irq = 11) is a 16550A kernel: ttyS7 at I/O 0x9800 (irq = 11) is a 16550A lspci -v (2.6.14): 02:0e.0 Serial controller: Lava Computer mfg Inc Quattro-PCI A (prog-if 02 [16550]) Flags: slow devsel, IRQ 11 I/O ports at a800 [size=8] I/O ports at a400 [size=8] 02:0e.1 Serial controller: Lava Computer mfg Inc Quattro-PCI B (prog-if 02 [16550]) Flags: slow devsel, IRQ 11 I/O ports at a000 [size=8] I/O ports at 9800 [size=8] Best regards, Jouni