I'm experiencing quite the same bug.
On a Dell Vostro 1500 (NVIDIA GeForce 8600M GT), I have an external monitor
with maximum resolution 1280x1024.
The strange thing is that it's not happening every time I plug it in, but it
happens randomly.
In this moment, I'm looking at the external monitor, with the 1280x1024
resolution. Yesterday, for example, there was a moment when the resolution was
not correctly set, and I found myself with a 1440x900 resolution fit in a
1024x768 (the screen moved as I moved my mouse - hope this is understandable,
I'm Italian).
Rebooting "fixed" it (although maybe at next reboot I'll find myself with the
wrong resolution).
greping /var/log/Xorg.* searching for "EDID" didn't show any result, but
"get-edid|parse-edid" shows problems (I'm attaching the complete
output):
[some text..]
VBE/DDC service about to be called
Read EDID
Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
Function supported
Call failed
The EDID data should not be trusted as the VBE call failed
EDID claims 32 more blocks left
*********** Something special has happened!
Please contact the author, Matthew Kern
E-mail: [email protected]
Please include full output from this program (especially that to stderr)
[more text...]
VBE/DDC service about to be called
Read EDID
Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
Function supported
Call failed
The EDID data should not be trusted as the VBE call failed
parse-edid: EDID checksum failed - data is corrupt. Continuing anyway.
parse-edid: first bytes don't match EDID version 1 header
parse-edid: do not trust output (if any).
[more text...]
EDID claims 32 more blocks left
EDID blocks left is wrong.
Your EDID is probably invalid.
** Attachment added: "get-edid|parse-edid output"
http://launchpadlibrarian.net/50666056/edid
--
External monitor suddenly gets wrong resolution on laptop (nvidia).
https://bugs.launchpad.net/bugs/479323
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