2016-04-02 15:08 GMT+01:00 Oskar Berggren <[email protected]>:
> Hi, > > After trying two different machines I'm beginning to feel like Skylake is > completely unusable with multiple monitors connected. Is this a known > limitation? Am I the only one experiencing this? > > First I tested on laptop Dell XPS 15 9550 with QHD display. Seems to work > fine with internal panel, though I haven't used it extensively. Immediately > or sometimes within a minute or two when I connect an external monitor > using HDMI the system freezes completely (ping reply stops). This is with > updated Fedora 23 with kernel from drm-intel-nigthly tested several times > during the last two months. I've reported this here: > https://bugs.freedesktop.org/show_bug.cgi?id=94625 with more details. > > > Now I've also got access to a Dell Precision Tower 3620. Being a tower, > this of course has no internal panel. Connecting one external monitor seems > to work, but again I've not used it extensively. The second I connect a > second monitor it freezes completely. Booting with two monitors connected > also doesn't work. This is with updated Fedora 23 and distribution kernel > 4.4.6-300 (waiting for download/build of drm-intel-nigthly to finish). CPU > is i7-6700 stepping 3 microcode 0x74. > More testing: It turns out both systems are reasonably stable using Fedora's 4.4.6-300 kernel - on HDMI and DP _without _ MST. This is what caused the problem - my DELL U2415 monitor with DP 1.2 enabled causes stability issues, system freeezes, or is not detected at all, on 4.4.6 and drm-intel-nightly. HDMI or DP 1.1 seems to work. However, drm-intel-nightly from last night is still very unstable with HDMI on the laptop, and also with DP 1.1 for external monitors on the tower system. /Oskar
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