https://bugzilla.kernel.org/show_bug.cgi?id=60639
Bug ID: 60639 Summary: RV635: Kernel displays black screen when monitor is connect via DisplayPort Product: Drivers Version: 2.5 Kernel Version: 3.10.3 (and earlier) Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: kernspam@schreib-doch-mal-wieder.de Regression: No
When the monitor is connected via DisplayPort I can see grub but once the kernel takes over, the screen goes black. When the same monitor is connected via DVI everything works.
Adding the kernel option "video=DP-1:1920x1200@75" makes at least the kernel messages and virtual consoles work. However, when X starts the screen goes black again. This might be related to the bug reported here: https://bugzilla.novell.com/show_bug.cgi?id=752593
Modeline from EDID: Detailed mode: Clock 154.000 MHz, 518 mm x 324 mm 1920 1968 2000 2080 hborder 0 1200 1203 1209 1235 vborder 0 +hsync -vsync Monitor ranges (GTF): 50-61Hz V, 30-83kHz H, max dotclock 170MHz
Kernel 3.10.3 (but also tested with 3.9.x and 3.8.x)
Graphic chip: ATI Mobility FireGL V5700 (the second intel chip should be disabled)