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After upgrading to Raring, my X stutters a lot whenever the eDP-1 output
is disabled (for example with xrandr). In this state, the kernel log is
also filled with numerous messages regarding invalid EDID checksums. The
behavior was not seen with Quantal. The problem also partially goes away
with mainline kernel 3.9.
I would describe the stutters as about 10 ms freezes occurring roughly
every second. Meanwhile, dmesg sees a lot of "[drm:drm_edid_block_valid]
*ERROR* EDID checksum is invalid, remainder is 48" and a few "nouveau E[
I2C][0000:01:00.0] AUXCH(1): tx req timeout 0x01114000". Behavior is
restored to normal when eDP-1 is re-enabled.
The problem was not seen in Quantal. Installing the 3.9 mainline kernel
partially mitigates the problem, but brings other ones, such as a
kworker thread pegged at 100% CPU. This could be unrelated.
The drm_kms_helper.poll=0 boot parameter does not help with the standard
Raring kernel, but is in fact neccessary with 3.9.
The problem seems to be unrelated to whether or not there are other
monitors attached, for example on DP-1 and VGA-1.
(Simply leaving eDP-1 enabled is not an option for me, as it has to be
disabled to use DP-1 and VGA-1 simultaneously on my laptop.)
Ubuntu version: 13.04
xserver-xorg-video-nouveau version: 1:1.0.7-0ubuntu1
Kernel version: 3.8.0-21.32
Graphics hardware: 01:00.0 VGA compatible controller: NVIDIA Corporation GT218M
[NVS 3100M] (rev a2)
** Affects: xserver-xorg-video-nouveau (Ubuntu)
Importance: Undecided
Status: New
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Turning off eDP-1 causes stutter
https://bugs.launchpad.net/bugs/1182051
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