On Wed, 09 May 2018, Feng Tang <feng.tang@xxxxxxxxx> wrote: > On Wed, May 09, 2018 at 10:53:53AM +0300, Jani Nikula wrote: >> On Wed, 09 May 2018, Feng Tang <feng.tang@xxxxxxxxx> wrote: >> > On Tue, May 08, 2018 at 10:30:19PM +0300, Jani Nikula wrote: >> >> On Wed, 09 May 2018, Feng Tang <feng.tang@xxxxxxxxx> wrote: >> >> >> Well if it's edp probing, then atm we do need to block since we have >> >> >> no support for panel hotplugging. And userspace generally no >> >> >> expectations that built-in panels come&go. async_synchronize_full >> >> >> making our fbdev code less async than desired is kinda a different >> >> >> story I think here. First step would be trying to figure out why we >> >> >> even bother with edp probing on this platform, when the thing isn't >> >> >> there. Sounds like broken VBT. >> >> > >> >> > Hi Daniel, >> >> > >> >> > Here are some of the VBT and DPCD related logs on my A3900 (bxt + GEN9 LP) >> >> > based NUC. but I don't have the knowledge to tell if the VBT is broken :) >> >> >> >> Please run current upstream drm-tip when you're suggesting changes to >> >> upstream code. Looks like you're running at most v4.14. This can't be >> >> emphasized enough. We can't and won't merge the changes unless they make >> >> sense with current code. >> > >> > Yes, I understand, the patch posted was created right after git-pulling >> > Linus' tree, and back-ported to test with 4.14 kernel. >> > >> >> >> >> As to vbt, please send me /sys/kernel/debug/dri/0/i915_vbt. >> > >> > Sure. as attached >> >> Your VBT claims the device has an eDP panel. Does it have one or not? > > After asking around, our platform (BXT NUC) does have a eDP interface (someone > has tested with a eDP screen), but most of our platforms are connected > with 2 HDMI LCD monitors. Sounds like you should have a different VBT for the cases where you ship with/without eDP connected. As you've noticed, we generally try pretty hard to talk to the panel if VBT says it's there, to avoid black screens which are a much worse scenario than delays in detection. BR, Jani. > > Thanks, > Feng -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
