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 -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
