traditional bug: only one of two serial ports found on HP Vectra XM
Hello,
historically I believed Linux very much. When it said my HP Vecra XM only has one serial port I was surprised, but believed it. That was some years ago. 2.4.18 still says that there is one serial port:
ttyS00 at 0x3f8 (irq=4) as a 16550A
However recently I had to work on the backside of the PC and found two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't both ports be detected?
Regards,
Ulrich Windl
(the one who is NOT subscribed in this honourable list)
Quoted 9 lines · Ulrich Windl
historically I believed Linux very much. When it said my HP Vecra XM only has one serial port I was surprised, but believed it. That was some years ago. 2.4.18 still says that there is one serial port:
ttyS00 at
0x3f8(irq=4) as a 16550AHowever recently I had to work on the backside of the PC and found two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't both ports be detected?
How about opening the case and checking whether those ports actually connected to motherboard? Checking BIOS config?
Without waiting for another 'some years' :-)
Seriously, do you have any reason to think second port is really exists beside physical connector?
--
vda
Quoted 11 lines · Denis Vlasenko
Quoted 9 lines · Ulrich Windl
historically I believed Linux very much. When it said my HP Vecra XM only has one serial port I was surprised, but believed it. That was some years ago. 2.4.18 still says that there is one serial port:
ttyS00 at
0x3f8(irq=4) as a 16550AHowever recently I had to work on the backside of the PC and found two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't both ports be detected?
Quoted 6 lines
How about opening the case and checking whether those ports actually connected to motherboard? Checking BIOS config?
Without waiting for another 'some years' :-)Seriously, do you have any reason to think second port is really exists beside physical connector?
If it exists, check if "lspnp" on a PNPBIOS enabled kernel would find your second port. There have been patches to find BIOS configured serial ports even if not at standard places.