On 05.04.2016 13:07, Boszormenyi Zoltan wrote: > 2016-04-05 05:40 keltezéssel, Michel Dänzer írta: >> On 05.04.2016 00:25, Boszormenyi Zoltan wrote: >>> >>> The application is Chromium in kiosk mode. The problem is that >>> sometimes the screen stays black after KMS kicks in. >> So the problem occurs even without X? Does it affect HDMI or >> DisplayPort, or both? > > It occurs on both but not without X. Ctrl-Alt-F2 gives me the > console login prompt. My phrasing was not what I wanted to write > and didn't finish the sentence really. X is started very early during > boot so I can see the console message only momentarily while > the screen is still in 80x25 VGA text mode. Restarting Xorg via > systemctl makes it working most of the time. > > Apparently, it's not Radeon specific. We were also able to reproduce > it on an Intel machine, too, with internal LVDS and external VGA outputs. I suspect it's a client side problem then. Comparing the good and bad dmesg output shows that Xorg is busily updating the screen in the good case (visible as radeon_crtc_page_flip gets called by TearFree) but not so in the bad case. Since the default Xorg startup behaviour is a black screen, it sounds like simply no client connects to Xorg / draws anything to the screen in the bad case. Maybe there's a race which can result in the client(s) starting up before Xorg, failing to establish the display connection, or something like that. > Is Xorg 1.16.4 still a supported version with new kernels? There's no direct version inter-dependency between Xorg and the kernel. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
