Issue is definitely related to DPMS. Disabling DPMS altogether prevents the
screen from turning off completely in turn preventing it from failing to turn
back on. Screen still blanks when I lock the screen but backlight remains on
and the screen doesn't go to "power saving" mode.
I have updated
Here is dmesg in 13.10:
[ cut here ]
[ 6803.837811] WARNING: CPU: 1 PID: 1251 at
/build/buildd/linux-3.11.0/drivers/gpu/drm/i915/intel_dp.c:2211
intel_dp_link_down+0x1b2/0x1e0 [i915]()
[ 6803.837816] Modules linked in: snd_seq_dummy(F) hid_generic hidp usbhid hid
pci_stub
Still present after updating to 13.10
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https://bugs.launchpad.net/bugs/1189639
Title:
[dp] External Screen doesn't wake up from sleep
To manage notifications a
file was in /sys/module/drm/parameters/debug (instead of modules).
Attached is dmesg
** Attachment added: "dmesg.log"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1189639/+attachment/3700814/+files/dmesg.log
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Public bug reported:
I have a Lenovo X1 Carbon with an external screen connected to a Mini DP to VGA
adapter. External screen works fine until the display goes to sleep for
inactivity (just the display goes to sleep, not the laptop).
When I return to the laptop, the built in screen wakes but the
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