[PLUG] sandybridge video

Carlos Konstanski ckonstanski at pippiandcarlos.com
Sun Aug 28 03:21:12 UTC 2011


Just got a Thinkpad with a Core 15 and a Sandybridge video card. The video
is acting odd in certain X windows but not others. So far I see xterm,
emacs, a qemu guest VM and the Android emulator affected.

The video will freeze until a newline is printed. It's acting like there
isn't enough buffer flushing going on. The blinking cursor will disappear in
xterm and emacs.  Focusing another window and then coming back causes a
refresh, followed by another freezing fit that can only be alleviated by
another focus switch.

I wonder if there's an Xorg driver option that might cause less buffer
"smarts" and better flushing.  Here's the list produced by Xorg -configure:

    #Option     "DRI"                   # [<bool>]
    #Option     "ColorKey"              # <i>
    #Option     "VideoKey"              # <i>
    #Option     "FallbackDebug"         # [<bool>]
    #Option     "Tiling"                # [<bool>]
    #Option     "LinearFramebuffer"     # [<bool>]
    #Option     "Shadow"                # [<bool>]
    #Option     "SwapbuffersWait"       # [<bool>]
    #Option     "TripleBuffer"          # [<bool>]
    #Option     "XvMC"                  # [<bool>]
    #Option     "XvPreferOverlay"       # [<bool>]
    #Option     "DebugFlushBatches"     # [<bool>]
    #Option     "DebugFlushCaches"      # [<bool>]
    #Option     "DebugWait"             # [<bool>]
    #Option     "HotPlug"               # [<bool>]
    #Option     "RelaxedFencing"        # [<bool>]

Thanks,

Carlos



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