Thanks for attaching the dmesg output with debugging turned on. Looking
through it I do notice this bit which looks possibly complicit in this
issue:
[ 515.630872] [drm:intel_prepare_page_flip], preparing flip with no unpin work?
[ 515.683339] [drm:intel_wait_for_vblank], vblank wait timed out
if the xrandr command line calls trigger the issue it seems part of the
bug is due to xorg itself or the driver
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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I attached the gsd-debug-randr.log file as asked in #4.
** Attachment added: gsd-debug-randr.log
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/840974/+attachment/2551483/+files/gsd-debug-randr.log
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The problem occurs both using an external monitor (Acer AL1715) attached to my
laptop and using only the laptop monitor.
When I try to change resolution from 1366x768 to 800x600 or 1024x768, the
screen goes black, after about 20 seconds the screen goes back to the original
1366x768 resolution.
As asked on #5 I tried to use this command:
xrandr --output LVDS1 --mode 1024x768
and this one
xrandr --output LVDS1 --mode 800x600
But when I launch these commands from a terminal, the screen goes black,
I tried to wait for about 2 miniutes, but seeing nothing happen, I typed
in CTRL+ALT+F1 and
Is that still an issue? Could you create gsd-debug-randr file in your
user directory, restart your session, change the screen settings and
copy the gsd-debug-randr.log which got create in your user directory
to the bug?
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Could you also give details about what screen you try to configure,
their resolution, placement, etc? Does it work using the xrandr command
line tools?
** Changed in: gnome-control-center (Ubuntu)
Importance: Undecided = Low
** Changed in: gnome-control-center (Ubuntu)
Status:
Hello, I've just reproduced the problem with xdiagnose.
I'm attaching the second dmesg.
Let me know if everything is ok.
Thanks.
** Attachment added: dmesg
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/840974/+attachment/2470889/+files/thirdDmesg.txt
** Changed in:
Turn on display debug information by running sudo xdiagnose, clicking
the first checkbox, apply, then reboot.
Now collect dmesg output, then reproduce the problem and collect a
second dmesg. You want the data that's in the second dmesg but not the
first.
Possibly this bug is related to bug
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https://bugs.launchpad.net/bugs/840974
Title:
configuration of external monitor on laptop does not work properly
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