|Summary:||[r280] Black screen on PPC with digital monitor on radeon / Cannot find any crtc or sizes|
|Product:||Drivers||Reporter:||Vlado Plaga (rechner)|
|Component:||Video(DRI - non Intel)||Assignee:||drivers_video-dri|
|Severity:||high||CC:||akpm, florian, maciej.rutecki, rjw|
|Bug Depends on:|
syslog from system without video output
Description Vlado Plaga 2011-07-20 21:29:48 UTC
Created attachment 66132 [details] syslog from system without video output Testing Kernel 3.0.0 (rc6 from Debian experimental) I encountered a problem with (DVI) display detection - the screen goes blank when trying to activate KMS. From syslog: [drm:radeon_add_legacy_connector] *ERROR* DVI: Failed to assign ddc bus! Check dmesg for i2c errors. [drm] DDC: no ddc bus - possible BIOS bug - please report to firstname.lastname@example.org No connectors reported connected with modes [drm] Cannot find any crtc or sizes - going 1024x768 To me this looks quite similar to #23222. With a VGA monitor the screen does not go blank, but I still don't get the login window in KDM (?). I'm using Ubuntu 11.04 and with a self-compiled 2.6.39-rc7 kernel I have working KMS (even though direct rendering does not work, as reported on https://bugs.freedesktop.org/show_bug.cgi?id=37169 ).
Comment 1 Alex Deucher 2011-07-22 21:59:15 UTC
Created attachment 66382 [details] fix This patch should fix the i2c setup.
Comment 2 Vlado Plaga 2011-07-23 17:24:47 UTC
Great, now I'm running Linux 3.0. :-) And the best thing: it looks like there's also progress regarding the aforementioned bug I reported on freedesktop.org - I'll have to investigate further. This is what glxinfo reports (instead of 'software renderer'): "OpenGL renderer string: Mesa DRI R200 (RV280 5962) 20090101 PowerPC/Altivec TCL DRI2"
Comment 3 Florian Mickler 2011-08-04 20:49:24 UTC
Patch: https://bugzilla.kernel.org/attachment.cgi?id=66382 Please close this bug if the patch hits Linus tree.