On 8/15/2012 6:47 PM, Daniel Vetter wrote:
On Wed, Aug 15, 2012 at 06:38:10PM -0400, Chun-Yu Shei wrote:
Hi,
I recently upgraded to a 27" monitor (2560x1440) from a 23" one
(1920x1080), and had to switch to Windows because the new monitor is
unusable in Linux. Today, about a month later, I decided to give
Linux another try, since there have been several updates to the
Intel graphics driver since then.
Unfortunately, it seems that it's still unusable with
xf86-video-intel 2.20.3 -- after a little while, the video signal to
the 27" monitor completely stops, and it goes into power saving
mode. I'm running dual monitors with the old 23", and that one
continues running fine when this happens. This happens on my
ThinkPad X220 (i5-2540M). The 27" is connected via DisplayPort, and
the 23" via DVI. SNA is enabled, if it makes any difference (I
haven't tried turning it off, but I probably should). This is the
biggest problem I'm facing when it comes to Linux support.
I also gave the new "TearFree" option a try, and while it does a
great job of eliminating tearing, it makes the two monitors become
mirrors of each other for some reason. If I take a screenshot with
the GNOME tool, the screenshot comes out as expected (unmirrored),
but the video output on the two monitors is mirrored in reality.
Disabling "TearFree" fixes this.
Also, when I'm using the ThinkPad's built-in display, it sometimes
turns off for no apparent reason, although it's not too big of a
deal since a suspend/resume cycle seems to fix things (and I haven't
used 2.20.3 long enough to experience this yet).
Any ideas/things I can do to help track these issues down?
For the screen blanking issues, the kernel is the important part. Please
boot with drm.debug=0xe added to your kernel bootline and grab the full
dmesg.
-Daniel
OK, I finally got around to doing this... I just upgraded to the 3.5.3
kernel and xf86-video-intel 2.20.5 as well.
Here's the initial dmesg upon bootup: http://pastebin.com/41F2AA0f
And here's the dmesg right after the 27" goes blank:
http://pastebin.com/3CTRETQ4 (not completely blank, though... there are
a few lines at the very left & top edge of the display)
A few seconds later, the display came back, and here's the dmesg right
after that: http://pastebin.com/9mdfY5P1
Chun-Yu
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