https://bugzilla.kernel.org/show_bug.cgi?id=91861 Bug ID: 91861 Summary: [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later Product: Drivers Version: 2.5 Kernel Version: 3.15 + later Hardware: Intel OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx Reporter: michael.selig@xxxxxxxxx Regression: No Created attachment 164451 --> https://bugzilla.kernel.org/attachment.cgi?id=164451&action=edit dmesg (kernel 3.18.3) - RS780 blank screen I use this machine as a HTPC connected to our TV via HDMI. It has been running Ubuntu of various versions using the RADEON driver with no problems until Ubuntu 4.10 (kernel 3.16), when this problem first showed itself. I can successfully boot 3.13 (from Ubuntu 4.04), but when it was announced that VDPAU was supported on this old Radeon hardware from 3.18, I was hoping that by upgrading to 3.18, it would not only solve the "blank screen" problem, but also give me better video performance on XBMC/KODI. Unfortunately 3.18 exhibits the same "blank screen" problem. I then tried installing other kernel versions (including 3.19rc5), but nothing from 3.15 onwards works. The RS780 hardware is integrated on the motherboard, and is fast enough for videos & TV etc, so I don't really want to change it for a noisy and/or heat generating video card. My symptoms are that, after seeing the Grub screen, I see a kernel message or 2 (nothing important) flashing up for a fraction of a second, but then it goes blank, saying "no signal". I do not see the normal purple Ubuntu splash screen, which appears before Xorg starts. Interestingly, on occasions it will boot 3.18 successfully, but that is usually after a reboot from 3.13 or 3.14. Once it boots successfully it seems fairly stable, and I have managed to watch videos and TV on 3.18 a couple of times though I haven't tested it for long. However if it is booted again, chances are that it will fail. When the screen is blank, the system is still up - I can SSH to the box fine. And it seems that Xorg is up and running fine - Xorg.0.log looks fine - it's just that I can't see anything! I have tried radeon.runpm=0 radeon.dpm=0, but they make no difference. I think this problem may be related to https://bugzilla.kernel.org/show_bug.cgi?id=83461. Any ideas? Thanks, Mike -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
