Red Hat Bugzilla – Bug 387551
inconsistent serial port assignment of tablet
Last modified: 2008-06-16 22:52:22 EDT
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Description of problem:
Previously discussed as
This is a problem with the Lenovo X61 Tablet.
The kernel now recognizes my docking bay. As a side effect, it will assign ttyS0 to the docking bay and ttyS1 to my tablet. Booting without docking bay results in ttyS0 being assigned to the tablet. Unfortunately, the ttyS# is configured in /etc/X11/xorg.conf and X doesn't start if the value is incorrect.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot with docking bay
2. Boot without docking bay
3. X will fail in either case 1 or 2, depending on /etc/X11/xorg.conf settings
X fails in one of the two cases
X should boot correctly in both cases
Sander, please get the output of "dmidecode" and attach in this bug.
Created attachment 269241 [details]
dmidecode with docking station
Output when booted with docking station
Sander, there's a BIOS update for your notebook you may try:
I didn't found the exact problem on the changelog but this one seems relevant:
(Fix) Trackpoint may not work after undocking from docking station with PS/2 mouse.
Do you mind trying updating the BIOS and trying again to avoid waste of time
chasing a bug that can be a BIOS bug?
Reporter has not replied whether BIOS update fixes the problem.
The BIOS update didn't fix the problem. I would be surprised if it did. What we
see is exactly the expected behavior, even though it is unwanted.
If the docking station is not attached, the tablet is mapped to ttyS0. If the
docking station is attached, some serial device in the docking station is mapped
to ttyS0. As a consequence, the tablet is mapped to ttyS1 (as it should). The
tablet is bound to fail in one of these cases, since there is a direct reference
in xorg.conf to ttyS#.
What IMHO would be needed to solve this issue is a mapping from e.g.
/dev/input/tablet that updates dynamically on boot to ttyS0 or ttyS1. Then, in
xorg.conf /dev/ttyS# can be replaced by /dev/input/tablet and it would work
independent of the docking station, or any other serial device that might cause
similar behavior in the future.
actually it's not the case:
pnp: Device 00:0a activated.
00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
+pnp: Device 00:0c activated.
+00:0c: ttyS1 at I/O 0x200 (irq = 5) is a NS16550A
notice that when you're using the docking, a new serial device appears, with a
different I/O address and pnp device id, but this new and different port is the
one the tablet is using instead of ttyS0. Notice that ttyS0 doesn't changes.
(In reply to comment #6)
> Hi Sander,
> actually it's not the case:
> pnp: Device 00:0a activated.
> 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> +pnp: Device 00:0c activated.
> +00:0c: ttyS1 at I/O 0x200 (irq = 5) is a NS16550A
> notice that when you're using the docking, a new serial device appears, with a
> different I/O address and pnp device id, but this new and different port is
> the one the tablet is using instead of ttyS0. Notice that ttyS0 doesn't
Ah okay, sorry you are right (although the mapping to /dev/input/tablet might
still be a good idea).
I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug and will try and assist you in resolving it if I can.
There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?
If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.
> There hasn't been much activity on this bug for a while. Could you tell me if
> you are still having problems with the latest kernel?
Yes, the bug still exists...
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