On Fri, Apr 27, 2012 at 8:39 PM, Nick Bowler <nbowler at elliptictech.com> wrote: > Hi Ben, > > On 2012-04-27 15:20 +1000, Ben Skeggs wrote: >> Does this patch help you at all? >> >> http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=a3a285f17867f0018de798b5ee85731ec1268305 > > Yes. ?I cherry-picked this patch on top of Linus' master (3.4-rc4+) and > this appears to solve the "black screen on VGA" problem described in the > original report. ?Thanks! > > Unfortunately, that's not the end of my VGA-related regressions. :( > > While tracking down the black screen issue, I've been having the monitor > directly connected to the video card the whole time, but now when I'm > connected through my KVM switch (an IOGear GCS1804), it appears that > something's going wrong with reading the EDID, because the available > modes are all screwed up (both console and X decide they want to drive > the display at 1024x768). ?Here's the output of xrandr on 3.2.15: > > ?% xrandr > ?Screen 1: minimum 320 x 200, current 1600 x 1200, maximum 4096 x 4096 > ?VGA-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) > 352mm x 264mm > ? ? 1600x1200 ? ? ?75.0*+ ? 70.0 ? ? 65.0 ? ? 60.0 > ? ? 1280x1024 ? ? ?85.0 + ? 75.0 ? ? 60.0 > ? ? 1920x1440 ? ? ?60.0 > ? ? 1856x1392 ? ? ?60.0 > ? ? 1792x1344 ? ? ?60.0 > ? ? 1920x1200 ? ? ?74.9 ? ? 59.9 > ? ? 1680x1050 ? ? ?84.9 ? ? 74.9 ? ? 60.0 > ? ? 1400x1050 ? ? ?85.0 ? ? 74.9 ? ? 60.0 > ? ? 1440x900 ? ? ? 84.8 ? ? 75.0 ? ? 59.9 > ? ? 1280x960 ? ? ? 85.0 ? ? 60.0 > ? ? 1360x768 ? ? ? 60.0 > ? ? 1280x800 ? ? ? 84.9 ? ? 74.9 ? ? 59.8 > ? ? 1152x864 ? ? ? 75.0 > ? ? 1280x768 ? ? ? 84.8 ? ? 74.9 ? ? 59.9 > ? ? 1024x768 ? ? ? 85.0 ? ? 75.1 ? ? 75.0 ? ? 70.1 ? ? 60.0 ? ? 43.5 ? ? 43.5 > ? ? 832x624 ? ? ? ?74.6 > ? ? 800x600 ? ? ? ?85.1 ? ? 72.2 ? ? 75.0 ? ? 60.3 ? ? 56.2 > ? ? 848x480 ? ? ? ?60.0 > ? ? 640x480 ? ? ? ?85.0 ? ? 75.0 ? ? 72.8 ? ? 72.8 ? ? 66.7 ? ? 60.0 ? ? 59.9 > ? ? 720x400 ? ? ? ?85.0 ? ? 87.8 ? ? 70.1 > ? ? 640x400 ? ? ? ?85.1 > ? ? 640x350 ? ? ? ?85.1 > ? ? 320x200 ? ? ? 165.1 > > And on 3.4-rc4+ (with your patch cherry-picked): > > ?% xrandr > ?Screen 1: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096 > ?VGA-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm > x 0mm > ? ? 1024x768 ? ? ? 60.0* > ? ? 800x600 ? ? ? ?60.3 ? ? 56.2 > ? ? 848x480 ? ? ? ?60.0 > ? ? 640x480 ? ? ? ?59.9 > ? ? 320x200 ? ? ? 165.1 > > Running xrandr on 3.4-rc4+ also causes the screen to go black for a > second when it does not on 3.2.15. ?It also causes several messages of > the form > > ?[drm] nouveau 0000:01:00.0: Load detected on output B > > to be logged. ?Also, looking at /sys/class/drm/card0-VGA-1/edid I see > that it is empty on 3.4-rc4+ and it is correct on 3.2.15. ?Things seem > to work OK when the KVM is not involved.
Were you ever able to fetch a EDID with the KVM involved? KVMs are notorious for not connecting the ddc pins. Alex
