https://bugs.freedesktop.org/show_bug.cgi?id=45291
Bug #: 45291 Summary: No video output via DisplayPort on Mobility HD 4670. Classification: Unclassified Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: All Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: jonimoose@gmail.com
Created attachment 56209 --> https://bugs.freedesktop.org/attachment.cgi?id=56209 dmesg
I have a Dell Studio XPS 1610 laptop and a Dell U2312HM monitor with DisplayPort. The monitor works in the BIOS but as soon as Grub loads and Linux starts to boot it blanks and enters Powersave mode.once in X xrandr reports it as on but there is no picture and the monitors OSD just continues to report that it is in Powersave mode. Enabling and disabling the monitor via Xrandr does not error and my windows manager resizes things as if it was enabled but the monitor still shows no input.
There are no errors in dmesg during this and everything is reported as working.(the warning at the end of dmesg is from a different HDMI monitor which I plugged later since the DisplayPort one wasn't working)